TY  - JOUR
AU  - Malešević, Aleksandar
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Savic, Slavica
AU  - Perać, Sanja
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2299
AB  - Systematic analysis of electrical characteristics of BaCe0.75In0.25O3-δ (BCI25) sintered sample was performed in a
dry and a wet argon atmosphere in the 250 ◦C–700 ◦C temperature range. The water vapor sensing properties of
BCI25 porous film and its response and recovery times were investigated under different conditions of temperature
and water vapor concentration. The 30 μm thick film obtained from the powder calcined at 1050 ◦C
exhibited sensitivity comparable to that of the sintered sample with a significantly shorter response and recovery
times. While the sensitivity of the film gradually decreased with a decrease in partial pressure of water vapor (p
(H2O)), a noticeable sensitivity was still observed at p(H2O) of 200 Pa. Decrease in conductivity depended
logarithmically on the partial pressure of water with the slope of 0.52 that is close to the theoretical value. After
several cycles, the reusability test proved an almost unchanged ratio between the impedance value in the dry and
the wet Ar atmosphere (p(H2O) = 2.34 kPa), which implied that BCI25, having good stability and sensitivity, is a
promising high-temperature humidity sensor.
PB  - Elsevier Ltd
PB  - Techna Group S.r.l.
T2  - Ceramics International
T1  - Electrical and sensing properties of indium-doped barium cerate
EP  - 15679
SP  - 15673
VL  - 49
DO  - 10.1016/j.ceramint.2023.01.159
ER  - 

@article{
author = "Malešević, Aleksandar and Radojković, Aleksandar and Žunić, Milan and Savic, Slavica and Perać, Sanja and Branković, Zorica and Branković, Goran",
year = "2023",
abstract = "Systematic analysis of electrical characteristics of BaCe0.75In0.25O3-δ (BCI25) sintered sample was performed in a
dry and a wet argon atmosphere in the 250 ◦C–700 ◦C temperature range. The water vapor sensing properties of
BCI25 porous film and its response and recovery times were investigated under different conditions of temperature
and water vapor concentration. The 30 μm thick film obtained from the powder calcined at 1050 ◦C
exhibited sensitivity comparable to that of the sintered sample with a significantly shorter response and recovery
times. While the sensitivity of the film gradually decreased with a decrease in partial pressure of water vapor (p
(H2O)), a noticeable sensitivity was still observed at p(H2O) of 200 Pa. Decrease in conductivity depended
logarithmically on the partial pressure of water with the slope of 0.52 that is close to the theoretical value. After
several cycles, the reusability test proved an almost unchanged ratio between the impedance value in the dry and
the wet Ar atmosphere (p(H2O) = 2.34 kPa), which implied that BCI25, having good stability and sensitivity, is a
promising high-temperature humidity sensor.",
publisher = "Elsevier Ltd, Techna Group S.r.l.",
journal = "Ceramics International",
title = "Electrical and sensing properties of indium-doped barium cerate",
pages = "15679-15673",
volume = "49",
doi = "10.1016/j.ceramint.2023.01.159"
}

Malešević, A., Radojković, A., Žunić, M., Savic, S., Perać, S., Branković, Z.,& Branković, G.. (2023). Electrical and sensing properties of indium-doped barium cerate. in Ceramics International
Elsevier Ltd., 49, 15673-15679.
https://doi.org/10.1016/j.ceramint.2023.01.159

Malešević A, Radojković A, Žunić M, Savic S, Perać S, Branković Z, Branković G. Electrical and sensing properties of indium-doped barium cerate. in Ceramics International. 2023;49:15673-15679.
doi:10.1016/j.ceramint.2023.01.159 .

Malešević, Aleksandar, Radojković, Aleksandar, Žunić, Milan, Savic, Slavica, Perać, Sanja, Branković, Zorica, Branković, Goran, "Electrical and sensing properties of indium-doped barium cerate" in Ceramics International, 49 (2023):15673-15679,
https://doi.org/10.1016/j.ceramint.2023.01.159 . .

TY  - CONF
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Savić, Slavica
AU  - Perać, Sanja
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2343
AB  - BaCe0.9Y0.1O3–δ has been known as one of the best proton conducting electrolyte, which enables its application in intermediate-temperature solid oxide fuel cells (IT-SOFC) operating between 500 °C and 700 °C. The main disadvantage of this material is its instability in a CO2-rich atmosphere that limits its application with respect to fuel selection. Therefore, many attempts has been made to improve its stability by replacing yttrium with other dopants, or by co-doping.
In this study, we compared BaCe0.9Y0.1O3–δ and BaCe0.85Y0.1M0.05O3–δ (M = {In, Zr, Nb}) electrolytes by taking into consideration the dopant properties (primarily the valence, electronegativity and ionic radius) and how they influenced the microstructure, conductivity and chemical stability of doped BaCeO3. The samples were synthesized by the citric-nitric autocombustion method. BaCe0.85Y0.1In0.05O3–δ was sintered at 1400 °C for 5 h in air, while the temperature of 1550 °C was required for the other materials to complete the sintering. This makes the doping with In a preferable method since sintering temperatures above 1500 °C can lead to a certain materials degradation resulting in BaO loss. The total conductivities (σ) measured at 700 °C in wet hydrogen decreased in the following order:
BaCe0.9Y0.1O3–δ > BaCe0.85Y0.1Zr0.05O3–δ > BaCe0.85Y0.1Nb0.05O3–δ > BaCe0.85Y0.1In0.05O3–δ. By comparing the stability of the ceramics exposed to a 100% CO2 atmosphere at 700 °C for 5 h and examined by X-ray analysis, it was observed that only BaCe0.85Y0.1In0.05O3–δ could sustain the aggressive environment. The exposed sample contained only traces of secondary phases, while the other compositions were partially or significantly decomposed. By taking into account the values of the Goldschmidt tolerance factor (t) and dopant electronegativity
PB  - Spectus Meeting World
C3  - 7th World Congress on Materials Science & Engineering
T1  - Tailoring of BaCe0.9Y0.1O3-d Electrolyte Properties by Co-Doping
IS  - 49
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2343
ER  - 

@conference{
author = "Radojković, Aleksandar and Žunić, Milan and Savić, Slavica and Perać, Sanja and Branković, Zorica and Branković, Goran",
year = "2023",
abstract = "BaCe0.9Y0.1O3–δ has been known as one of the best proton conducting electrolyte, which enables its application in intermediate-temperature solid oxide fuel cells (IT-SOFC) operating between 500 °C and 700 °C. The main disadvantage of this material is its instability in a CO2-rich atmosphere that limits its application with respect to fuel selection. Therefore, many attempts has been made to improve its stability by replacing yttrium with other dopants, or by co-doping.
In this study, we compared BaCe0.9Y0.1O3–δ and BaCe0.85Y0.1M0.05O3–δ (M = {In, Zr, Nb}) electrolytes by taking into consideration the dopant properties (primarily the valence, electronegativity and ionic radius) and how they influenced the microstructure, conductivity and chemical stability of doped BaCeO3. The samples were synthesized by the citric-nitric autocombustion method. BaCe0.85Y0.1In0.05O3–δ was sintered at 1400 °C for 5 h in air, while the temperature of 1550 °C was required for the other materials to complete the sintering. This makes the doping with In a preferable method since sintering temperatures above 1500 °C can lead to a certain materials degradation resulting in BaO loss. The total conductivities (σ) measured at 700 °C in wet hydrogen decreased in the following order:
BaCe0.9Y0.1O3–δ > BaCe0.85Y0.1Zr0.05O3–δ > BaCe0.85Y0.1Nb0.05O3–δ > BaCe0.85Y0.1In0.05O3–δ. By comparing the stability of the ceramics exposed to a 100% CO2 atmosphere at 700 °C for 5 h and examined by X-ray analysis, it was observed that only BaCe0.85Y0.1In0.05O3–δ could sustain the aggressive environment. The exposed sample contained only traces of secondary phases, while the other compositions were partially or significantly decomposed. By taking into account the values of the Goldschmidt tolerance factor (t) and dopant electronegativity",
publisher = "Spectus Meeting World",
journal = "7th World Congress on Materials Science & Engineering",
title = "Tailoring of BaCe0.9Y0.1O3-d Electrolyte Properties by Co-Doping",
number = "49",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2343"
}

Radojković, A., Žunić, M., Savić, S., Perać, S., Branković, Z.,& Branković, G.. (2023). Tailoring of BaCe0.9Y0.1O3-d Electrolyte Properties by Co-Doping. in 7th World Congress on Materials Science & Engineering
Spectus Meeting World.(49).
https://hdl.handle.net/21.15107/rcub_rimsi_2343

Radojković A, Žunić M, Savić S, Perać S, Branković Z, Branković G. Tailoring of BaCe0.9Y0.1O3-d Electrolyte Properties by Co-Doping. in 7th World Congress on Materials Science & Engineering. 2023;(49).
https://hdl.handle.net/21.15107/rcub_rimsi_2343 .

Radojković, Aleksandar, Žunić, Milan, Savić, Slavica, Perać, Sanja, Branković, Zorica, Branković, Goran, "Tailoring of BaCe0.9Y0.1O3-d Electrolyte Properties by Co-Doping" in 7th World Congress on Materials Science & Engineering, no. 49 (2023),
https://hdl.handle.net/21.15107/rcub_rimsi_2343 .

TY  - CONF
AU  - Malešević, Aleksandar
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Savic, Slavica
AU  - Perać, Sanja
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2215
AB  - Acceptor-doped perovskites (ABO3 general formula) with large lattice constants (such as BaCeO3, SrCeO3, and BaZrO3) have been known as fast proton conductors. The ability to conduct protons at high temperatures makes them suitable for humidity sensors in a high-temperature environment. The presence of traces of humidity can play a key role in the functioning of certain industrial processes at higher temperatures. Electrical characteristics of BaCe0.75In0.25O3–δ (BCI25) sintered sample were analyzed in a dry and a wet argon atmosphere in the 250–700 °C temperature range. The water vapor sensing properties of BCI25 porous film and its response and recovery times were investigated under different conditions of temperature and water vapor concentration. A 30 μm thick film obtained from the powder calcined at 1050 °C exhibited sensitivity comparable to that of the sintered sample with significantly shorter response and recovery times. While the sensitivity of the film gradually decreased with a decrease in partial pressure of water vapor (p(H2O)), a noticeable sensitivity was still observed at p(H2O) of 200 Pa. Decrease in conductivity depended logarithmically on the partial pressure of water with the slope of 0.52 that is close to the theoretical value. After several cycles, the reusability test proved an almost unchanged ratio between the impedance value in the dry and the wet Ar atmosphere (p(H2O) = 2.34 kPa), which implied that BCI25, having good stability and sensitivity, is a promising high-temperature humidity sensor.
PB  - Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - 7th Conference of the Serbian Society for Ceramic Materials
T1  - High temperature humidity sensing ability of indium-doped barium cerate
SP  - 76
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2215
ER  - 

@conference{
author = "Malešević, Aleksandar and Radojković, Aleksandar and Žunić, Milan and Savic, Slavica and Perać, Sanja and Branković, Zorica and Branković, Goran",
year = "2023",
abstract = "Acceptor-doped perovskites (ABO3 general formula) with large lattice constants (such as BaCeO3, SrCeO3, and BaZrO3) have been known as fast proton conductors. The ability to conduct protons at high temperatures makes them suitable for humidity sensors in a high-temperature environment. The presence of traces of humidity can play a key role in the functioning of certain industrial processes at higher temperatures. Electrical characteristics of BaCe0.75In0.25O3–δ (BCI25) sintered sample were analyzed in a dry and a wet argon atmosphere in the 250–700 °C temperature range. The water vapor sensing properties of BCI25 porous film and its response and recovery times were investigated under different conditions of temperature and water vapor concentration. A 30 μm thick film obtained from the powder calcined at 1050 °C exhibited sensitivity comparable to that of the sintered sample with significantly shorter response and recovery times. While the sensitivity of the film gradually decreased with a decrease in partial pressure of water vapor (p(H2O)), a noticeable sensitivity was still observed at p(H2O) of 200 Pa. Decrease in conductivity depended logarithmically on the partial pressure of water with the slope of 0.52 that is close to the theoretical value. After several cycles, the reusability test proved an almost unchanged ratio between the impedance value in the dry and the wet Ar atmosphere (p(H2O) = 2.34 kPa), which implied that BCI25, having good stability and sensitivity, is a promising high-temperature humidity sensor.",
publisher = "Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "7th Conference of the Serbian Society for Ceramic Materials",
title = "High temperature humidity sensing ability of indium-doped barium cerate",
pages = "76",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2215"
}

Malešević, A., Radojković, A., Žunić, M., Savic, S., Perać, S., Branković, Z.,& Branković, G.. (2023). High temperature humidity sensing ability of indium-doped barium cerate. in 7th Conference of the Serbian Society for Ceramic Materials
Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia., 76.
https://hdl.handle.net/21.15107/rcub_rimsi_2215

Malešević A, Radojković A, Žunić M, Savic S, Perać S, Branković Z, Branković G. High temperature humidity sensing ability of indium-doped barium cerate. in 7th Conference of the Serbian Society for Ceramic Materials. 2023;:76.
https://hdl.handle.net/21.15107/rcub_rimsi_2215 .

Malešević, Aleksandar, Radojković, Aleksandar, Žunić, Milan, Savic, Slavica, Perać, Sanja, Branković, Zorica, Branković, Goran, "High temperature humidity sensing ability of indium-doped barium cerate" in 7th Conference of the Serbian Society for Ceramic Materials (2023):76,
https://hdl.handle.net/21.15107/rcub_rimsi_2215 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2196
AB  - Titanium dioxide exists in three different crystalline forms: anatase, rutile, and brookite.
It is well known that on heating, anatase and brookite can be easily transformed to rutile
which is considered as the most stable phase [1]. The aim of this study was to investigate
the influence of different dopants on anatase-rutile phase transition. Doped TiO2 samples
(TiO2-M, M = V, Mn, and Cu) containing 5 at% of the dopant were prepared by mixing
anatase and appropriate oxide (V2O5, MnO2, and CuO) in agate mortar for 30 min. In
order to determine the heat treatment conditions, TG/DTA analysis of the samples was
performed. Finally, mixed powders as well as the pure anatase phase (TiO2) were heat
treated at 700 °C for 3 h. XRD analysis was performed to estimate the phase composition,
unit cell parameters, and crystallite sizes. Rutile was formed in all samples: 2.8 wt% in
TiO2, 25.5 wt% in TiO2-Mn, 75.8 wt% in TiO2-V, and 95.2 wt% in TiO2-Cu. In TiO2-
Mn, TiO2-V, and TiO2, anatase was present beside rutile, while in the case of TiO2-Cu
4.8 wt% of the unreacted CuO was found. Obtained results revealed that all the dopants
accelerated anatase-rutile phase transition in the following order: Cu2+ > V5+ > Mn4+. It
is well known that defects are the driving force for the anatase-rutile phase transition and
since Ti4+ and Mn4+ are isovalent, no new defects were formed by incorporating Mn4+
ions into TiO2 lattice. This resulted in the least amount of rutile in TiO2-Mn comparing
to TiO2-V and TiO2-Cu where new defects were probably formed. As no initial oxides
were found in TiO2-Mn and TiO2-V, it can be concluded that Mn4+ and V5+ ions were
incorporated into the anatase lattice. On the other hand, in the case of TiO2-Cu, even 4.8
wt% of initial CuO was found. The detected residue of CuO can be explained by the fact
that the ionic radius of Cu2+ for an octahedral environment (0.870 Å) is much larger than
that of Ti4+ (0.745 Å), unlike those for Mn4+ (0.670 Å) and V5+ (0.680 Å). Although
almost all introduced quantity of CuO, i.e. 96 %, was found in TiO2-Cu, a small amount
was surely necessary to cause the anatase-rutile phase transition. According to calculated
crystallite sizes which were in the range of 55 – 90 nm, nanocrystalline samples were
prepared.
1. P. I. Gouma, M. J. Mills J. Am. Ceram. Soc. 2001, 84 (3) 619–622.
PB  - Serbian Chemical Society and Serbian Young Chemists’ Club, Belgrade, Serbia
C3  - 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia
T1  - The influence of dopants on anatase-rutile phase transition
SP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2196
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2023",
abstract = "Titanium dioxide exists in three different crystalline forms: anatase, rutile, and brookite.
It is well known that on heating, anatase and brookite can be easily transformed to rutile
which is considered as the most stable phase [1]. The aim of this study was to investigate
the influence of different dopants on anatase-rutile phase transition. Doped TiO2 samples
(TiO2-M, M = V, Mn, and Cu) containing 5 at% of the dopant were prepared by mixing
anatase and appropriate oxide (V2O5, MnO2, and CuO) in agate mortar for 30 min. In
order to determine the heat treatment conditions, TG/DTA analysis of the samples was
performed. Finally, mixed powders as well as the pure anatase phase (TiO2) were heat
treated at 700 °C for 3 h. XRD analysis was performed to estimate the phase composition,
unit cell parameters, and crystallite sizes. Rutile was formed in all samples: 2.8 wt% in
TiO2, 25.5 wt% in TiO2-Mn, 75.8 wt% in TiO2-V, and 95.2 wt% in TiO2-Cu. In TiO2-
Mn, TiO2-V, and TiO2, anatase was present beside rutile, while in the case of TiO2-Cu
4.8 wt% of the unreacted CuO was found. Obtained results revealed that all the dopants
accelerated anatase-rutile phase transition in the following order: Cu2+ > V5+ > Mn4+. It
is well known that defects are the driving force for the anatase-rutile phase transition and
since Ti4+ and Mn4+ are isovalent, no new defects were formed by incorporating Mn4+
ions into TiO2 lattice. This resulted in the least amount of rutile in TiO2-Mn comparing
to TiO2-V and TiO2-Cu where new defects were probably formed. As no initial oxides
were found in TiO2-Mn and TiO2-V, it can be concluded that Mn4+ and V5+ ions were
incorporated into the anatase lattice. On the other hand, in the case of TiO2-Cu, even 4.8
wt% of initial CuO was found. The detected residue of CuO can be explained by the fact
that the ionic radius of Cu2+ for an octahedral environment (0.870 Å) is much larger than
that of Ti4+ (0.745 Å), unlike those for Mn4+ (0.670 Å) and V5+ (0.680 Å). Although
almost all introduced quantity of CuO, i.e. 96 %, was found in TiO2-Cu, a small amount
was surely necessary to cause the anatase-rutile phase transition. According to calculated
crystallite sizes which were in the range of 55 – 90 nm, nanocrystalline samples were
prepared.
1. P. I. Gouma, M. J. Mills J. Am. Ceram. Soc. 2001, 84 (3) 619–622.",
publisher = "Serbian Chemical Society and Serbian Young Chemists’ Club, Belgrade, Serbia",
journal = "9th Conference of Young Chemists of Serbia, Novi Sad, Serbia",
title = "The influence of dopants on anatase-rutile phase transition",
pages = "164",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2196"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2023). The influence of dopants on anatase-rutile phase transition. in 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia
Serbian Chemical Society and Serbian Young Chemists’ Club, Belgrade, Serbia., 164.
https://hdl.handle.net/21.15107/rcub_rimsi_2196

Milojković N, Simović B, Žunić M, Dapčević A. The influence of dopants on anatase-rutile phase transition. in 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia. 2023;:164.
https://hdl.handle.net/21.15107/rcub_rimsi_2196 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "The influence of dopants on anatase-rutile phase transition" in 9th Conference of Young Chemists of Serbia, Novi Sad, Serbia (2023):164,
https://hdl.handle.net/21.15107/rcub_rimsi_2196 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Radovanovic, Lidija
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2146
AB  - It is well known that titanium dioxide is usually used as a photocatalyst due to its
nontoxicity, low cost, and stability. Conductive polymer, polypyrrole (PPy) is also
appropriate for photocatalytic application being stable and easy to synthesize. The aim of
this study was to obtain TiO2/PPy composites reaching higher photocatalytic efficiency
compared to pure TiO2. Therefore, TiO2 was synthesized by the hydrothermal route,
while PPy was obtained by the chemical oxidative polymerization method. TiO2/x% PPy
nanocomposites (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) were prepared by hand-mixing of powders
in agate mortar for 30 min in order to find the optimal PPy content. Obtained materials
were characterized by XRD, FTIR, TG/DSC, FESEM, and UV-Vis methods while their
photocatalytic activity was estimated towards degradation of Reactive Orange 16 dye
(RO16). A kinetic study was performed and a detailed mechanism of RO16
photocatalytic degradation in the presence of TiO2/PPy composites was proposed based
on scavenger tests. The results showed that, despite PPy addition, TiO2 was present in
anatase form in all samples with sufficiently small crystallites (around 26 nm) and
preserved structure with no significant deviations in unit cell parameters. The band gap
energy decreased with increasing of PPy content, from 3.14 eV for pure TiO2 to 2.94 eV
for TiO2/5% PPy. All the obtained nanocomposites demonstrated higher photocatalytic
activity than pure TiO2, whereby TiO2/1% PPy nanocomposite was the most efficient by
degrading 99.6% of the dye for 105 min under simulated solar light. Therefore, the
amount of 1 wt.% should be consider as optimal amount of PPy in a composite. It is
established that the photodegradation of RO16 using TiO2/PPy nanocomposites follows
pseudo-first kinetic order. RO16 photocatalytic degradation mechanism in the presence
of TiO2/PPy nanocomposites can be well described by direct Z-scheme heterojunction
which has never been reported for TiO2/PPy system.
PB  - Faculty of Technology, University of Novi Sad, Serbia
C3  - 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia
T1  - Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2146
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Radovanovic, Lidija and Dapčević, Aleksandra",
year = "2023",
abstract = "It is well known that titanium dioxide is usually used as a photocatalyst due to its
nontoxicity, low cost, and stability. Conductive polymer, polypyrrole (PPy) is also
appropriate for photocatalytic application being stable and easy to synthesize. The aim of
this study was to obtain TiO2/PPy composites reaching higher photocatalytic efficiency
compared to pure TiO2. Therefore, TiO2 was synthesized by the hydrothermal route,
while PPy was obtained by the chemical oxidative polymerization method. TiO2/x% PPy
nanocomposites (x = 0, 0.5, 1, 1.5, 3, 5 wt.%) were prepared by hand-mixing of powders
in agate mortar for 30 min in order to find the optimal PPy content. Obtained materials
were characterized by XRD, FTIR, TG/DSC, FESEM, and UV-Vis methods while their
photocatalytic activity was estimated towards degradation of Reactive Orange 16 dye
(RO16). A kinetic study was performed and a detailed mechanism of RO16
photocatalytic degradation in the presence of TiO2/PPy composites was proposed based
on scavenger tests. The results showed that, despite PPy addition, TiO2 was present in
anatase form in all samples with sufficiently small crystallites (around 26 nm) and
preserved structure with no significant deviations in unit cell parameters. The band gap
energy decreased with increasing of PPy content, from 3.14 eV for pure TiO2 to 2.94 eV
for TiO2/5% PPy. All the obtained nanocomposites demonstrated higher photocatalytic
activity than pure TiO2, whereby TiO2/1% PPy nanocomposite was the most efficient by
degrading 99.6% of the dye for 105 min under simulated solar light. Therefore, the
amount of 1 wt.% should be consider as optimal amount of PPy in a composite. It is
established that the photodegradation of RO16 using TiO2/PPy nanocomposites follows
pseudo-first kinetic order. RO16 photocatalytic degradation mechanism in the presence
of TiO2/PPy nanocomposites can be well described by direct Z-scheme heterojunction
which has never been reported for TiO2/PPy system.",
publisher = "Faculty of Technology, University of Novi Sad, Serbia",
journal = "15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia",
title = "Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light",
pages = "87",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2146"
}

Milojković, N., Simović, B., Žunić, M., Radovanovic, L.,& Dapčević, A.. (2023). Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light. in 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia
Faculty of Technology, University of Novi Sad, Serbia., 87.
https://hdl.handle.net/21.15107/rcub_rimsi_2146

Milojković N, Simović B, Žunić M, Radovanovic L, Dapčević A. Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light. in 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia. 2023;:87.
https://hdl.handle.net/21.15107/rcub_rimsi_2146 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Radovanovic, Lidija, Dapčević, Aleksandra, "Photocatalytic degradation of Reactive Orange 16 dye using TiO2/PPy nanocomposites under simulated solar light" in 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia (2023):87,
https://hdl.handle.net/21.15107/rcub_rimsi_2146 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2001
AB  - It is well known that TiO2-based Degussa P-25 is the mostly used comer-cial photocatalyst and that TiO2 exists in three crystalline modifications: tetragonal anatase (I41/amd) and rutile (P42/mnm) and orthorhombic brookite (Pbca). On heating, anatase and brookite, as metastable phases, can be transformed to rutile. The aim of this work was to investigate the effect of different dopants on anatase-rutile phase transition and thus on their photocatalytic behavior. For that matter, samples TiO2 M (M = Cu, Mn and V) having 5 at.% of dopants were prepared by 30 minutes hand-mixing of anatase and corresponding oxide (CuO, MnO2 and V2O5) powders in an agate mortar following by heat treatment at 700 °C for 3 h. The powder of pure anatase phase was also treated at same conditions. TG/DTA was used to define thermal treatment, and the obtained samples were characterized by powder XRD method in order to reach phase compositions, unit cell parameters and crystallite sizes. Since in the case of undoped anatase only 3 wt.% of rutile was formed, the presence of dopants accelerated phase transition: 26 and 76 wt.% of rutile was obtained beside anatase in TiO2 Mn and TiO2 V, respectively, while complete anatase to rutile phase transition occured in TiO2-Cu. The least rutile quantity in TiO2-Mn is related to the isovalency of Ti4+ and Мn4+ meaning that the incorporation of Мn4+ in TiO2 is not followed by the formation of new defects, which are driving force for phase transition, as in the case of TiO2 Cu. About 5 wt.% of the unreacted CuO was found in TiO2 Cu, which is almost all introduced quantity of CuO. This can be related to the fact that the ionic radius of Cu2+ for octahedral environment (0.870 Å) is larger than that of Ti4+ (0.745 Å). As a result, Cu2+ ions can hardly be incorporated in TiO2 comparing to smaller Мn4+ (0.670 Å) and V5+ (0.680 Å) although a small amount of Cu2+ surely was necessary to cause phase transition. Since no residues of initial oxides were found in TiO2 Mn and TiO2 V, it can be concluded that these metal ions were incorporated into anatase lattice. By comparing the calculated unit cell parameters of anatase mutually, the shrinkage along c-axis was revealed meaning the shortening of bond distances between М–Оapical. The photocatalytic activity of all synthesized samples will be tested since nanocrystalline samples were obtained according to determined crystallite sizes (55–90 nm).
AB  - Degussa P-25 је фотокатализатор на бази титан(IV)-оксида, који се најчешће користи у индустрији. TiO2 се јавља у три полиморфне модификације: тетрагоналним анатасу (I41/amd) и рутилу (P42/mnm) и ромбичном брукиту (Pbca). Анатас и брукит, као метастабилне фазе, приликом загревања прелазе у рутил. Циљ овог истраживања је испитивање утицаја различитих допаната на фазни прелаз анатаса у рутил као и на фотокаталитичка својства. Узорци TiO2-M (M = Cu, Mn и V), који садрже 5 at.% допанта, припремљени су термохемијском реакцијом на 700 °C током 3 h између хомогенизованих прахова анатаса и одговарајућих оксида (CuO, MnO2 и V2O5). Ради поређења, прах чистог анатаса је термички третиран под истим условима. Помоћу ТГ/ДТ анализе дефинисани су услови термичког третмана, док су добијени узорци окарактерисани рендгенском дифракцијом на поликристалном материјалу да би се одредио фазни састав, параметри јединичних ћелија и величина кристалита. У случају недопираног анатаса настало је свега 3 mas.% рутила, 26 и 76 mas.% рутила добијено је у TiO2 Mn и TiO2 V, редом, док се потпуни фазни прелаз анатас–рутил одиграо у TiO2 Cu. Ово значи да присуство допанта убрзава фазну трансформацију. Најмања количина рутила у TiO2 Mn може се објаснити изовалентним Ti4+ и Мn4+, тј. да уградња Мn4+ у TiO2 није праћена настанком нових дефеката који представљају вучну силу за одигравање фазног прелаза, као што је то случај код TiO2 Cu. Око 5 mas.% непрореаговалог CuO (готово почетна количина) заостало је у TiO2 Cu, зато што се Cu2+-јони теже уграђују у решетку TiO2 због већег радијуса Cu2+ у октаедарском окружењу (0,870 Å) од радијуса Ti4+ (0,745 Å), за разлику од мањих Мn4+ (0,670 Å) и V5+ (0,680 Å). Ипак, сигурно је мала количина Cu2+-јона била неопходна како би иницирала фазни прелаз. Како у TiO2 Mn и TiO2 V нису присутни остаци полазних оксида, може се закључити да су се ови јони метала уградили у решетку анатаса. Међусобним поређењем параметара јединичне ћелије анатаса, уочено је скраћење дуж c-осе, што указује на скраћење дужина веза М–Оапикални. Израчуната величина кристалита (55–90 nm) показала је да су сви добијени узорци нанокристални, па ће њихова фотокаталитичка својства бити испитана.
PB  - Serbian Crystallographic Society, Belgrade, Serbia
C3  - 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia
T1  - Effect of dopants on anatase structure
SP  - 24
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2001
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2023",
abstract = "It is well known that TiO2-based Degussa P-25 is the mostly used comer-cial photocatalyst and that TiO2 exists in three crystalline modifications: tetragonal anatase (I41/amd) and rutile (P42/mnm) and orthorhombic brookite (Pbca). On heating, anatase and brookite, as metastable phases, can be transformed to rutile. The aim of this work was to investigate the effect of different dopants on anatase-rutile phase transition and thus on their photocatalytic behavior. For that matter, samples TiO2 M (M = Cu, Mn and V) having 5 at.% of dopants were prepared by 30 minutes hand-mixing of anatase and corresponding oxide (CuO, MnO2 and V2O5) powders in an agate mortar following by heat treatment at 700 °C for 3 h. The powder of pure anatase phase was also treated at same conditions. TG/DTA was used to define thermal treatment, and the obtained samples were characterized by powder XRD method in order to reach phase compositions, unit cell parameters and crystallite sizes. Since in the case of undoped anatase only 3 wt.% of rutile was formed, the presence of dopants accelerated phase transition: 26 and 76 wt.% of rutile was obtained beside anatase in TiO2 Mn and TiO2 V, respectively, while complete anatase to rutile phase transition occured in TiO2-Cu. The least rutile quantity in TiO2-Mn is related to the isovalency of Ti4+ and Мn4+ meaning that the incorporation of Мn4+ in TiO2 is not followed by the formation of new defects, which are driving force for phase transition, as in the case of TiO2 Cu. About 5 wt.% of the unreacted CuO was found in TiO2 Cu, which is almost all introduced quantity of CuO. This can be related to the fact that the ionic radius of Cu2+ for octahedral environment (0.870 Å) is larger than that of Ti4+ (0.745 Å). As a result, Cu2+ ions can hardly be incorporated in TiO2 comparing to smaller Мn4+ (0.670 Å) and V5+ (0.680 Å) although a small amount of Cu2+ surely was necessary to cause phase transition. Since no residues of initial oxides were found in TiO2 Mn and TiO2 V, it can be concluded that these metal ions were incorporated into anatase lattice. By comparing the calculated unit cell parameters of anatase mutually, the shrinkage along c-axis was revealed meaning the shortening of bond distances between М–Оapical. The photocatalytic activity of all synthesized samples will be tested since nanocrystalline samples were obtained according to determined crystallite sizes (55–90 nm)., Degussa P-25 је фотокатализатор на бази титан(IV)-оксида, који се најчешће користи у индустрији. TiO2 се јавља у три полиморфне модификације: тетрагоналним анатасу (I41/amd) и рутилу (P42/mnm) и ромбичном брукиту (Pbca). Анатас и брукит, као метастабилне фазе, приликом загревања прелазе у рутил. Циљ овог истраживања је испитивање утицаја различитих допаната на фазни прелаз анатаса у рутил као и на фотокаталитичка својства. Узорци TiO2-M (M = Cu, Mn и V), који садрже 5 at.% допанта, припремљени су термохемијском реакцијом на 700 °C током 3 h између хомогенизованих прахова анатаса и одговарајућих оксида (CuO, MnO2 и V2O5). Ради поређења, прах чистог анатаса је термички третиран под истим условима. Помоћу ТГ/ДТ анализе дефинисани су услови термичког третмана, док су добијени узорци окарактерисани рендгенском дифракцијом на поликристалном материјалу да би се одредио фазни састав, параметри јединичних ћелија и величина кристалита. У случају недопираног анатаса настало је свега 3 mas.% рутила, 26 и 76 mas.% рутила добијено је у TiO2 Mn и TiO2 V, редом, док се потпуни фазни прелаз анатас–рутил одиграо у TiO2 Cu. Ово значи да присуство допанта убрзава фазну трансформацију. Најмања количина рутила у TiO2 Mn може се објаснити изовалентним Ti4+ и Мn4+, тј. да уградња Мn4+ у TiO2 није праћена настанком нових дефеката који представљају вучну силу за одигравање фазног прелаза, као што је то случај код TiO2 Cu. Око 5 mas.% непрореаговалог CuO (готово почетна количина) заостало је у TiO2 Cu, зато што се Cu2+-јони теже уграђују у решетку TiO2 због већег радијуса Cu2+ у октаедарском окружењу (0,870 Å) од радијуса Ti4+ (0,745 Å), за разлику од мањих Мn4+ (0,670 Å) и V5+ (0,680 Å). Ипак, сигурно је мала количина Cu2+-јона била неопходна како би иницирала фазни прелаз. Како у TiO2 Mn и TiO2 V нису присутни остаци полазних оксида, може се закључити да су се ови јони метала уградили у решетку анатаса. Међусобним поређењем параметара јединичне ћелије анатаса, уочено је скраћење дуж c-осе, што указује на скраћење дужина веза М–Оапикални. Израчуната величина кристалита (55–90 nm) показала је да су сви добијени узорци нанокристални, па ће њихова фотокаталитичка својства бити испитана.",
publisher = "Serbian Crystallographic Society, Belgrade, Serbia",
journal = "28th Conference of the Serbian Crystallographic Society, Čačak, Serbia",
title = "Effect of dopants on anatase structure",
pages = "24",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2001"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2023). Effect of dopants on anatase structure. in 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia
Serbian Crystallographic Society, Belgrade, Serbia., 24.
https://hdl.handle.net/21.15107/rcub_rimsi_2001

Milojković N, Simović B, Žunić M, Dapčević A. Effect of dopants on anatase structure. in 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia. 2023;:24.
https://hdl.handle.net/21.15107/rcub_rimsi_2001 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "Effect of dopants on anatase structure" in 28th Conference of the Serbian Crystallographic Society, Čačak, Serbia (2023):24,
https://hdl.handle.net/21.15107/rcub_rimsi_2001 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Radovanovic, Lidija
AU  - Dapčević, Aleksandra
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1988
AB  - Titan(IV)-oksid je jedan od najčešće korišćenih fotokatalizatora, dok za polipirol (PPy)
postoje potvrde da je pogodan za ovu primenu. Cilj ovog rada bio je dobijanje kompozita
TiO2/PPy sa boljom fotokatalitičkom aktivnosti u odnosu na TiO2. Kako bi se optimizovao
sadržaj PPy u kompozitu, sintetisani su uzorci TiO2/x%PPy (x = 0, 0,5, 1, 1,5, 3, 5 mas.%),
koji su okarakterisani TG/DTA, XRD, FTIR, FESEM i UV-Vis metodama, dok su njihova
fotokatalitička svojstva ispitana kroz razgradnju tekstilne boje RO16. Nanokristalni TiO2 je
dobijen u obliku anatasa veličine kristalita oko 2 nm, dok su izračunati parametri
jedinične ćelije potvrdili da je kristalna struktura anatasa ostala nepromenjena nakon
dodatka PPy. Gotovo svi uzorci (izuzev TiO2/3%PPy) su fotokatalitički aktivniji od TiO2,
dok je TiO2/1%PPy pokazao najizraženiju fotokatalitičku aktivnost razgradivši 9 % boje
nakon 75 min.
AB  - Titanium(IV) oxide is one of the most used photocatalysts while polypyrrole (PPy) is a
promising material for photocatalytic application. The aim of this work was to obtain
TiO2/PPy composites exhibiting higher photocatalytic activity than TiO2. In order to
determine the optimal PPy content in a composite, TiO2/x%PPy (x = 0, 0.5, 1, 1.5, 3, 5
wt.%) samples were synthesized and characterized by TG/DTA, XRD, FTIR, FESEM and
UV-Vis methods, while the photocatalytic behavior was examined towards the degradation
of the textile dye RO16. Nanocrystalline TiO2 was obtained in anatase form with crystallite
size around 26 nm and preserved anatase crystal structure despite the addition of PPy
according to the calculated unit cell parameters. Almost all samples (except TiO2/3%PPy)
showed better photocatalytic activity than TiO2 while the best photocatalytic activity was
demonstrated by TiO2/1%PPy which degraded 98 % of the dye after 75 min.
PB  - Srpsko hemijsko društvo, Beograd
C3  - 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts
T1  - TiO2/PPy nanocomposites for photocatalytic application
SP  - 144
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1988
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Radovanovic, Lidija and Dapčević, Aleksandra",
year = "2023",
abstract = "Titan(IV)-oksid je jedan od najčešće korišćenih fotokatalizatora, dok za polipirol (PPy)
postoje potvrde da je pogodan za ovu primenu. Cilj ovog rada bio je dobijanje kompozita
TiO2/PPy sa boljom fotokatalitičkom aktivnosti u odnosu na TiO2. Kako bi se optimizovao
sadržaj PPy u kompozitu, sintetisani su uzorci TiO2/x%PPy (x = 0, 0,5, 1, 1,5, 3, 5 mas.%),
koji su okarakterisani TG/DTA, XRD, FTIR, FESEM i UV-Vis metodama, dok su njihova
fotokatalitička svojstva ispitana kroz razgradnju tekstilne boje RO16. Nanokristalni TiO2 je
dobijen u obliku anatasa veličine kristalita oko 2 nm, dok su izračunati parametri
jedinične ćelije potvrdili da je kristalna struktura anatasa ostala nepromenjena nakon
dodatka PPy. Gotovo svi uzorci (izuzev TiO2/3%PPy) su fotokatalitički aktivniji od TiO2,
dok je TiO2/1%PPy pokazao najizraženiju fotokatalitičku aktivnost razgradivši 9 % boje
nakon 75 min., Titanium(IV) oxide is one of the most used photocatalysts while polypyrrole (PPy) is a
promising material for photocatalytic application. The aim of this work was to obtain
TiO2/PPy composites exhibiting higher photocatalytic activity than TiO2. In order to
determine the optimal PPy content in a composite, TiO2/x%PPy (x = 0, 0.5, 1, 1.5, 3, 5
wt.%) samples were synthesized and characterized by TG/DTA, XRD, FTIR, FESEM and
UV-Vis methods, while the photocatalytic behavior was examined towards the degradation
of the textile dye RO16. Nanocrystalline TiO2 was obtained in anatase form with crystallite
size around 26 nm and preserved anatase crystal structure despite the addition of PPy
according to the calculated unit cell parameters. Almost all samples (except TiO2/3%PPy)
showed better photocatalytic activity than TiO2 while the best photocatalytic activity was
demonstrated by TiO2/1%PPy which degraded 98 % of the dye after 75 min.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts",
title = "TiO2/PPy nanocomposites for photocatalytic application",
pages = "144",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1988"
}

Milojković, N., Simović, B., Žunić, M., Radovanovic, L.,& Dapčević, A.. (2023). TiO2/PPy nanocomposites for photocatalytic application. in 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts
Srpsko hemijsko društvo, Beograd., 144.
https://hdl.handle.net/21.15107/rcub_rimsi_1988

Milojković N, Simović B, Žunić M, Radovanovic L, Dapčević A. TiO2/PPy nanocomposites for photocatalytic application. in 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts. 2023;:144.
https://hdl.handle.net/21.15107/rcub_rimsi_1988 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Radovanovic, Lidija, Dapčević, Aleksandra, "TiO2/PPy nanocomposites for photocatalytic application" in 59th Meeting of the Serbian Chemical Society, Novi Sad, Serbia, Book of Abstracts (2023):144,
https://hdl.handle.net/21.15107/rcub_rimsi_1988 .

TY  - CONF
AU  - Malešević, Aleksandar
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
AU  - Perać, Sanja
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2212
AB  - Mixed oxides with the perovskite structure are known for their proton conducting ability at the temperatures above 500 °C. This characteristic makes them suitable for application as an electrolyte for intermediate-temperature solid oxide fuel cells. Doping of BaCeO3 with In3+ in place of Ce4+ leads to emergence of oxygen vacancies which take part in creation of proton defects. The characteristics of the BaCe1-xInxO3-δ were investigated in a wide range of In dopant concentrations (x = 0.05; 0.10; 0.15; 0.20; 0.25; 0.30; 0.35 and 0.40). All the samples were synthesized by a citric-nitric autocombustion method. The dense electrolytes were formed after sintering at 1300 °C for 5 h in air. X-ray powder diffraction analysis showed that powders with In content greater than 25 mol% contained In2O3 as a secondary phase. The highest total conductivity around 5×10–3 S•cm–1 was measured for the sample BaCe0.75In0.25O3-δ in the wet hydrogen atmosphere at 700 °C. After exposure to pure CO2 atmosphere at 700 °C for 5 h, the samples were investigated by X-ray diffraction analysis. It was found that even 15 mol% In could completely suppress degradation of the electrolyte. Ni-
BaCe0.75In0.25O3-δ/BaCe0.75In0.25O3-δ/LSCF-BaCe0.75In0.25O3-δ fuel cell was tested in wet hydrogen atmosphere and power density output of 264 mW•cm–2 was measured at 700 °C. This result is an indication of stability and functionality of this electrolyte and its versatility in respect to type of fuel and performing environment.
PB  - Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - 6th Conference of the Serbian Society for Ceramic Materials
T1  - Stability and functionality of BaCe1-xInxO3-δ as a high temperature proton conducting electrolyte for solid oxide fuel cells
SP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2212
ER  - 

@conference{
author = "Malešević, Aleksandar and Radojković, Aleksandar and Žunić, Milan and Dapčević, Aleksandra and Perać, Sanja and Branković, Zorica and Branković, Goran",
year = "2022",
abstract = "Mixed oxides with the perovskite structure are known for their proton conducting ability at the temperatures above 500 °C. This characteristic makes them suitable for application as an electrolyte for intermediate-temperature solid oxide fuel cells. Doping of BaCeO3 with In3+ in place of Ce4+ leads to emergence of oxygen vacancies which take part in creation of proton defects. The characteristics of the BaCe1-xInxO3-δ were investigated in a wide range of In dopant concentrations (x = 0.05; 0.10; 0.15; 0.20; 0.25; 0.30; 0.35 and 0.40). All the samples were synthesized by a citric-nitric autocombustion method. The dense electrolytes were formed after sintering at 1300 °C for 5 h in air. X-ray powder diffraction analysis showed that powders with In content greater than 25 mol% contained In2O3 as a secondary phase. The highest total conductivity around 5×10–3 S•cm–1 was measured for the sample BaCe0.75In0.25O3-δ in the wet hydrogen atmosphere at 700 °C. After exposure to pure CO2 atmosphere at 700 °C for 5 h, the samples were investigated by X-ray diffraction analysis. It was found that even 15 mol% In could completely suppress degradation of the electrolyte. Ni-
BaCe0.75In0.25O3-δ/BaCe0.75In0.25O3-δ/LSCF-BaCe0.75In0.25O3-δ fuel cell was tested in wet hydrogen atmosphere and power density output of 264 mW•cm–2 was measured at 700 °C. This result is an indication of stability and functionality of this electrolyte and its versatility in respect to type of fuel and performing environment.",
publisher = "Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "6th Conference of the Serbian Society for Ceramic Materials",
title = "Stability and functionality of BaCe1-xInxO3-δ as a high temperature proton conducting electrolyte for solid oxide fuel cells",
pages = "57",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2212"
}

Malešević, A., Radojković, A., Žunić, M., Dapčević, A., Perać, S., Branković, Z.,& Branković, G.. (2022). Stability and functionality of BaCe1-xInxO3-δ as a high temperature proton conducting electrolyte for solid oxide fuel cells. in 6th Conference of the Serbian Society for Ceramic Materials
Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia., 57.
https://hdl.handle.net/21.15107/rcub_rimsi_2212

Malešević A, Radojković A, Žunić M, Dapčević A, Perać S, Branković Z, Branković G. Stability and functionality of BaCe1-xInxO3-δ as a high temperature proton conducting electrolyte for solid oxide fuel cells. in 6th Conference of the Serbian Society for Ceramic Materials. 2022;:57.
https://hdl.handle.net/21.15107/rcub_rimsi_2212 .

Malešević, Aleksandar, Radojković, Aleksandar, Žunić, Milan, Dapčević, Aleksandra, Perać, Sanja, Branković, Zorica, Branković, Goran, "Stability and functionality of BaCe1-xInxO3-δ as a high temperature proton conducting electrolyte for solid oxide fuel cells" in 6th Conference of the Serbian Society for Ceramic Materials (2022):57,
https://hdl.handle.net/21.15107/rcub_rimsi_2212 .

TY  - JOUR
AU  - Malešević, Aleksandar
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
AU  - Perać, Sanja
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1545
AB  - The properties of BaCe1-xInxO3-delta (x = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, and 0.40) as proton conducting electrolyte are examined. The dense electrolyte is formed after sintering at 1300 degrees C for 5 h in air. The samples with In content > 25 mol% contain In2O3 as a secondary phase. The highest total conductivity is around 5x10(-3) S/cm for BaCe0.75In0.25O3-delta in the wet hydrogen atmosphere at 700 degrees C. After exposure to pure CO2 atmosphere at 700 degrees C for 5 h, the concentrations of at least 15 mol% In can completely suppress degradation of the electrolyte. The power density of Ni-BaCe0.75In0.25O3-delta/BaCe0.75In0.25O3-delta/LSCF-BaCe0.75In0.25O3-delta fuel cell tested in wet hydrogen atmosphere reaches 264 mW/cm(2) at 700 degrees C. This result is an indication of stability and functionality of this electrolyte and its versatility in respect to type of fuel and performing environment.
PB  - Springer, New York
T2  - Journal of Advanced Ceramics
T1  - Evaluation of stability and functionality of BaCe1-xInxO3-delta electrolyte in a wider range of indium concentration
EP  - 453
IS  - 3
SP  - 443
VL  - 11
DO  - 10.1007/s40145-021-0547-1
ER  - 

@article{
author = "Malešević, Aleksandar and Radojković, Aleksandar and Žunić, Milan and Dapčević, Aleksandra and Perać, Sanja and Branković, Zorica and Branković, Goran",
year = "2022",
abstract = "The properties of BaCe1-xInxO3-delta (x = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, and 0.40) as proton conducting electrolyte are examined. The dense electrolyte is formed after sintering at 1300 degrees C for 5 h in air. The samples with In content > 25 mol% contain In2O3 as a secondary phase. The highest total conductivity is around 5x10(-3) S/cm for BaCe0.75In0.25O3-delta in the wet hydrogen atmosphere at 700 degrees C. After exposure to pure CO2 atmosphere at 700 degrees C for 5 h, the concentrations of at least 15 mol% In can completely suppress degradation of the electrolyte. The power density of Ni-BaCe0.75In0.25O3-delta/BaCe0.75In0.25O3-delta/LSCF-BaCe0.75In0.25O3-delta fuel cell tested in wet hydrogen atmosphere reaches 264 mW/cm(2) at 700 degrees C. This result is an indication of stability and functionality of this electrolyte and its versatility in respect to type of fuel and performing environment.",
publisher = "Springer, New York",
journal = "Journal of Advanced Ceramics",
title = "Evaluation of stability and functionality of BaCe1-xInxO3-delta electrolyte in a wider range of indium concentration",
pages = "453-443",
number = "3",
volume = "11",
doi = "10.1007/s40145-021-0547-1"
}

Malešević, A., Radojković, A., Žunić, M., Dapčević, A., Perać, S., Branković, Z.,& Branković, G.. (2022). Evaluation of stability and functionality of BaCe1-xInxO3-delta electrolyte in a wider range of indium concentration. in Journal of Advanced Ceramics
Springer, New York., 11(3), 443-453.
https://doi.org/10.1007/s40145-021-0547-1

Malešević A, Radojković A, Žunić M, Dapčević A, Perać S, Branković Z, Branković G. Evaluation of stability and functionality of BaCe1-xInxO3-delta electrolyte in a wider range of indium concentration. in Journal of Advanced Ceramics. 2022;11(3):443-453.
doi:10.1007/s40145-021-0547-1 .

Malešević, Aleksandar, Radojković, Aleksandar, Žunić, Milan, Dapčević, Aleksandra, Perać, Sanja, Branković, Zorica, Branković, Goran, "Evaluation of stability and functionality of BaCe1-xInxO3-delta electrolyte in a wider range of indium concentration" in Journal of Advanced Ceramics, 11, no. 3 (2022):443-453,
https://doi.org/10.1007/s40145-021-0547-1 . .

TY  - CONF
AU  - Simović, Bojana
AU  - Milojković, Natalija
AU  - Žunić, Milan
AU  - Branković, Goran
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1990
AB  - The structural, microstructural, optical and photocatalytic properties of
hydrothermally obtained single-phase ZnO and CeO2@ZnO nanocomposites have
been investigated by the XRPD, FESEM, HRTEM/SAED and UV-vis techniques. In
order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in
ZnO powders was determined by varying the quantity of CeO2 from 0 to 10 mol%.
The results showed that CeO2 with spherical crystallites of about 5 nm was
distributed onto the ZnO surface, whose crystallites displayed a bimodal
distribution, from nano- to microcrystallites. The morphology of ZnO particles
varied from elongated nanograins to microrods that further formed a 3-D tie-like
morphology which was disrupted by CeO2 adding. By degrading 90% of RO16 dye
in 180 minutes, the composite containing 5 mol% of CeO2 showed approximately
for 30% better photocatalytic efficiency comparing to other samples, although all the
obtained powders have similar structural, microstructural and optical characteristics.
This is obviously the optimal ratio of these two phases, in which synergy of CeO2
adsorption and ZnO photocatalytic effect reaches its maximum due to reduced
recombination rate and improved adsorption. The kinetic of RO16 degradation could
be described by a pseudo-first order model.
PB  - Institut za multidisciplinarna istraživanja, Belgrade, Serbia
C3  - 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,
T1  - Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite
SP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1990
ER  - 

@conference{
author = "Simović, Bojana and Milojković, Natalija and Žunić, Milan and Branković, Goran and Dapčević, Aleksandra",
year = "2022",
abstract = "The structural, microstructural, optical and photocatalytic properties of
hydrothermally obtained single-phase ZnO and CeO2@ZnO nanocomposites have
been investigated by the XRPD, FESEM, HRTEM/SAED and UV-vis techniques. In
order to improve the photocatalytic efficiency of ZnO, the optimal CeO2 content in
ZnO powders was determined by varying the quantity of CeO2 from 0 to 10 mol%.
The results showed that CeO2 with spherical crystallites of about 5 nm was
distributed onto the ZnO surface, whose crystallites displayed a bimodal
distribution, from nano- to microcrystallites. The morphology of ZnO particles
varied from elongated nanograins to microrods that further formed a 3-D tie-like
morphology which was disrupted by CeO2 adding. By degrading 90% of RO16 dye
in 180 minutes, the composite containing 5 mol% of CeO2 showed approximately
for 30% better photocatalytic efficiency comparing to other samples, although all the
obtained powders have similar structural, microstructural and optical characteristics.
This is obviously the optimal ratio of these two phases, in which synergy of CeO2
adsorption and ZnO photocatalytic effect reaches its maximum due to reduced
recombination rate and improved adsorption. The kinetic of RO16 degradation could
be described by a pseudo-first order model.",
publisher = "Institut za multidisciplinarna istraživanja, Belgrade, Serbia",
journal = "6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,",
title = "Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite",
pages = "54",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1990"
}

Simović, B., Milojković, N., Žunić, M., Branković, G.,& Dapčević, A.. (2022). Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite. in 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,
Institut za multidisciplinarna istraživanja, Belgrade, Serbia., 54.
https://hdl.handle.net/21.15107/rcub_rimsi_1990

Simović B, Milojković N, Žunić M, Branković G, Dapčević A. Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite. in 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia,. 2022;:54.
https://hdl.handle.net/21.15107/rcub_rimsi_1990 .

Simović, Bojana, Milojković, Natalija, Žunić, Milan, Branković, Goran, Dapčević, Aleksandra, "Improved photocatalytic degradation of RO16 dye using hydrothermally synthesized CeO2@ZnO nanocomposite" in 6rd Conference of the Serbian Society for Ceramic Materials, Belgrade, Serbia, (2022):54,
https://hdl.handle.net/21.15107/rcub_rimsi_1990 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1989
AB  - Poznato je da je titan-dioksid, kao netoksičan, stabilan i ekonomičan materijal, jedan od
najčešće korišćenih fotokatalizatora. S druge strane, elektroprovodni polianilin (PANI) je
takođe pogodan kandidat za primenu u fotokatalizi. Cilj ovog rada bio je dobijanje
nanokompozita TiO2/PANI sa boljom fotokatalitičkom aktivnošću u odnosu na TiO2. U
cilju optimizacije sadržaja polimera sintetisano je 4 uzorka TiO2/x%PANI (x = 0, 1, 3 i
5 mas.%), koji su okarakterisani XRD i TG/DTA metodama, dok je fotokatalitička
aktivnost ispitana kroz razgradnju toksične tekstilne boje RO16. Pokazano je da su svi
kompoziti fotokatalitički aktivniji od TiO2, i da optimalan sadržaj polianilina iznosi
3 mas.%. Naime, uzorak TiO2/3%PANI je, nakon 60 minuta, razgradio 95 % boje, što je za
17 % više u odnosu na TiO2, dok je nakon 120 minuta fotorazgradnja boje potpuna. Pored
toga, ovaj uzorak je pokazao čak 14 puta izraženiju adsorpciju od TiO2. Efikasnost
TiO2/5%PANI je slična TiO2/3%PANI, ali sa slabije izraženim adsorpcionim svojstvima,
dok je efikasnost TiO2/1%PANI bliska TiO2.
AB  - It is well known that the non-toxic, stable and economical titanium dioxide is one of the
most commonly used photocatalysts. On the other hand, the conductive polyaniline (PANI)
is also suitable candidate for photocatalytic application. The aim of this work was to obtain
the TiO2/PANI nanocomposites with increased photocatalytic activity comparing to TiO2.
In order to determine the optimal PANI content, four TiO2/x%PANI samples (x = 0, 1, 3
and 5 wt.%) were synthesized and characterized by XRD and TG/DTA analysis. The
photocatalytic activity was tested on the toxic textile RO16 dye. It is shown that all the
composites exhibited better photocatalytic performances than TiO2 and that the optimal
PANI content amounted 3 wt.%. Namely, the TiO2/3%PANI degraded 95 % of the dye
within 60 minutes, which is for 17 % better comparing to TiO2. The full photodegradation
was reached in 120 min. This sample showed even 14 times better adsorption than TiO2.
The efficiency of TiO2/5%PANI was similar to TiO2/3%PANI, but with poorer adsorption,
while the efficiency of TiO2/1%PANI was close to TiO2.
PB  - Srpsko hemijsko društvo/Serbian Chemical Society
C3  - 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts
T1  - TiO2/PANI nanocomposites for photocatalytic application
T1  - Nanokompoziti TiO2/PANI za primenu u fotokatalizi
SP  - 105
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1989
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2022",
abstract = "Poznato je da je titan-dioksid, kao netoksičan, stabilan i ekonomičan materijal, jedan od
najčešće korišćenih fotokatalizatora. S druge strane, elektroprovodni polianilin (PANI) je
takođe pogodan kandidat za primenu u fotokatalizi. Cilj ovog rada bio je dobijanje
nanokompozita TiO2/PANI sa boljom fotokatalitičkom aktivnošću u odnosu na TiO2. U
cilju optimizacije sadržaja polimera sintetisano je 4 uzorka TiO2/x%PANI (x = 0, 1, 3 i
5 mas.%), koji su okarakterisani XRD i TG/DTA metodama, dok je fotokatalitička
aktivnost ispitana kroz razgradnju toksične tekstilne boje RO16. Pokazano je da su svi
kompoziti fotokatalitički aktivniji od TiO2, i da optimalan sadržaj polianilina iznosi
3 mas.%. Naime, uzorak TiO2/3%PANI je, nakon 60 minuta, razgradio 95 % boje, što je za
17 % više u odnosu na TiO2, dok je nakon 120 minuta fotorazgradnja boje potpuna. Pored
toga, ovaj uzorak je pokazao čak 14 puta izraženiju adsorpciju od TiO2. Efikasnost
TiO2/5%PANI je slična TiO2/3%PANI, ali sa slabije izraženim adsorpcionim svojstvima,
dok je efikasnost TiO2/1%PANI bliska TiO2., It is well known that the non-toxic, stable and economical titanium dioxide is one of the
most commonly used photocatalysts. On the other hand, the conductive polyaniline (PANI)
is also suitable candidate for photocatalytic application. The aim of this work was to obtain
the TiO2/PANI nanocomposites with increased photocatalytic activity comparing to TiO2.
In order to determine the optimal PANI content, four TiO2/x%PANI samples (x = 0, 1, 3
and 5 wt.%) were synthesized and characterized by XRD and TG/DTA analysis. The
photocatalytic activity was tested on the toxic textile RO16 dye. It is shown that all the
composites exhibited better photocatalytic performances than TiO2 and that the optimal
PANI content amounted 3 wt.%. Namely, the TiO2/3%PANI degraded 95 % of the dye
within 60 minutes, which is for 17 % better comparing to TiO2. The full photodegradation
was reached in 120 min. This sample showed even 14 times better adsorption than TiO2.
The efficiency of TiO2/5%PANI was similar to TiO2/3%PANI, but with poorer adsorption,
while the efficiency of TiO2/1%PANI was close to TiO2.",
publisher = "Srpsko hemijsko društvo/Serbian Chemical Society",
journal = "58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts",
title = "TiO2/PANI nanocomposites for photocatalytic application, Nanokompoziti TiO2/PANI za primenu u fotokatalizi",
pages = "105",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1989"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2022). TiO2/PANI nanocomposites for photocatalytic application. in 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts
Srpsko hemijsko društvo/Serbian Chemical Society., 105.
https://hdl.handle.net/21.15107/rcub_rimsi_1989

Milojković N, Simović B, Žunić M, Dapčević A. TiO2/PANI nanocomposites for photocatalytic application. in 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts. 2022;:105.
https://hdl.handle.net/21.15107/rcub_rimsi_1989 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "TiO2/PANI nanocomposites for photocatalytic application" in 58th Meeting of the Serbian Chemical Society, Belgrade, Book of Abstracts (2022):105,
https://hdl.handle.net/21.15107/rcub_rimsi_1989 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Simović, Bojana
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1987
AB  - Titanium dioxide is the most suitable semiconductor for photocatalytic application due
to its high efficiency, increased stability, low-cost, and non-toxicity. However, it is
possible to enhance the photocatalytic activity of TiO2 by homogenizing it with
conductive polymers. One of the most attractive conductive polymers is polypyrrole
(PPy) owing to its stability, low-cost, and special redox properties. The aim of this work
was to obtain the TiO2/PPy nanocomposites with a higher photocatalytic activity
compared to TiO2. In order to determine the optimal content of PPy, four TiO2/x%PPy
samples (x = 0, 1, 3, and 5 wt.%) were synthesized and characterized by XRD and
TG/DSC analyses. The photocatalytic activity was examined towards the degradation of
toxic textile azo dye Reactive Orange 16. It was observed that an increase in PPy content
led to better adsorption capacity of the synthesized nanocomposites. Samples
TiO2/1%PPy and TiO2/5%PPy demonstrated better photocatalytic activity than TiO2,
while TiO2/3%PPy showed very similar photocatalytic activity to TiO2. Near complete
degradation of the dye (98 %) was reached in 75 min by using TiO2/1%PPy, comparing
to pure TiO2, which degraded the same amount of the dye in 120 min. Considering all
the obtained results, the optimal content of PPy in the composite for degradation of
Reactive Orange 16 is 1 wt.%.
PB  - Serbian Chemical Society
C3  - Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts
T1  - Highly efficient TiO2/Ppy photocatalysts
SP  - 93
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1987
ER  - 

@conference{
author = "Milojković, Natalija and Simović, Bojana and Žunić, Milan and Dapčević, Aleksandra",
year = "2022",
abstract = "Titanium dioxide is the most suitable semiconductor for photocatalytic application due
to its high efficiency, increased stability, low-cost, and non-toxicity. However, it is
possible to enhance the photocatalytic activity of TiO2 by homogenizing it with
conductive polymers. One of the most attractive conductive polymers is polypyrrole
(PPy) owing to its stability, low-cost, and special redox properties. The aim of this work
was to obtain the TiO2/PPy nanocomposites with a higher photocatalytic activity
compared to TiO2. In order to determine the optimal content of PPy, four TiO2/x%PPy
samples (x = 0, 1, 3, and 5 wt.%) were synthesized and characterized by XRD and
TG/DSC analyses. The photocatalytic activity was examined towards the degradation of
toxic textile azo dye Reactive Orange 16. It was observed that an increase in PPy content
led to better adsorption capacity of the synthesized nanocomposites. Samples
TiO2/1%PPy and TiO2/5%PPy demonstrated better photocatalytic activity than TiO2,
while TiO2/3%PPy showed very similar photocatalytic activity to TiO2. Near complete
degradation of the dye (98 %) was reached in 75 min by using TiO2/1%PPy, comparing
to pure TiO2, which degraded the same amount of the dye in 120 min. Considering all
the obtained results, the optimal content of PPy in the composite for degradation of
Reactive Orange 16 is 1 wt.%.",
publisher = "Serbian Chemical Society",
journal = "Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts",
title = "Highly efficient TiO2/Ppy photocatalysts",
pages = "93",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1987"
}

Milojković, N., Simović, B., Žunić, M.,& Dapčević, A.. (2022). Highly efficient TiO2/Ppy photocatalysts. in Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts
Serbian Chemical Society., 93.
https://hdl.handle.net/21.15107/rcub_rimsi_1987

Milojković N, Simović B, Žunić M, Dapčević A. Highly efficient TiO2/Ppy photocatalysts. in Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts. 2022;:93.
https://hdl.handle.net/21.15107/rcub_rimsi_1987 .

Milojković, Natalija, Simović, Bojana, Žunić, Milan, Dapčević, Aleksandra, "Highly efficient TiO2/Ppy photocatalysts" in Eight Conference of the Young Chemists of  Serbia, Belgrade, Book of Abstracts (2022):93,
https://hdl.handle.net/21.15107/rcub_rimsi_1987 .

TY  - CONF
AU  - Milojković, Natalija
AU  - Orlić, Marina
AU  - Dikić, Jelena
AU  - Žunić, Milan
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1969
AB  - Regarding enormous expansion of bacterial contamination as well as their increase resistivity to commonly used disinfectants, there is a great demand for antibacterial material, which will not be based on organic compounds. Among various inorganic substances, environmentally friendly, low-cost and chemically stable ZnO and TiO2 demonstrate considerable antibacterial activity.
This work primarily focuses on idea of developing novel disinfectant based on both, ZnO and TiO2, which would integrate all the worthy properties of both oxides. For that matter, titanium(IV) butoxide was dissolved in a solution of zinc acetate following with the ammonia addition until pH value was 8.5. Half of the initial solution was hydrothermally treated, dried and calcined at 500 (H-ZnTi-500) and 800°C (H-ZnTi-800). Two other samples (ZnTi-500 and ZnTi-800) were obtained from the other half of the initial solution which was directly dried and calcined under the same conditions. The samples were characterized by XRD including Rietveld refinement, FESEM
and TG/DTA. Antibacterial activity was examined towards Gram-positive S. aureus and Gram-negative E. coli .
The results showed that only ZnTi-800 consisted of pure Zn2TiO4 (Fd-3m) while Zn TiO was the major phase in three other samples. In the case of samples calcined at 500 °C, traces of ZnO were found. H-ZnTi-800 contained three phases: Zn2TiO4, ZnO and Zn2Ti3O8 (P4332). Cubic Zn2TiO4 contains two cation sites: tetrahedrally coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The calculated a-parameters of all obtained Zn2TiO4 as well as Zn–O and Zn/Ti–O bond distances were independent of synthesis. At 500 °C nanocrystalline Zn2TiO4 were obtained with the crystallite sizes 26 and 71 nm for H-ZnTi-500 and ZnTi-500, respectively, while microcrystalline phases were obtained at 800 °C with the crystallite sizes larger than 110 nm. The soft agglomerates consisted of smaller particles were obtained at 500 °C comparing to samples at 800 °C having more compact agglomerates.
The best antibacterial activity with high reduction in the number of bacteria cells (87.6 % of E. coli and 63.4 % of S. aureus) was exhibited by the ZnTi-500. It means that the purity of samples, crystallite size and softness of agglomerates, influence antibacterial activity and that optimal level of all factors should be reached since ZnTi-500 was almost pure with sufficiently small crystallites and soft agglomerates.
PB  - European Powder Diffraction Conference (17 ; 2022 ; Šibenik)
C3  - European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
T1  - A novel disinfectant based on zinc orthotitanate
SP  - 206
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1969
ER  - 

@conference{
author = "Milojković, Natalija and Orlić, Marina and Dikić, Jelena and Žunić, Milan and Simović, Bojana and Dapčević, Aleksandra",
year = "2022",
abstract = "Regarding enormous expansion of bacterial contamination as well as their increase resistivity to commonly used disinfectants, there is a great demand for antibacterial material, which will not be based on organic compounds. Among various inorganic substances, environmentally friendly, low-cost and chemically stable ZnO and TiO2 demonstrate considerable antibacterial activity.
This work primarily focuses on idea of developing novel disinfectant based on both, ZnO and TiO2, which would integrate all the worthy properties of both oxides. For that matter, titanium(IV) butoxide was dissolved in a solution of zinc acetate following with the ammonia addition until pH value was 8.5. Half of the initial solution was hydrothermally treated, dried and calcined at 500 (H-ZnTi-500) and 800°C (H-ZnTi-800). Two other samples (ZnTi-500 and ZnTi-800) were obtained from the other half of the initial solution which was directly dried and calcined under the same conditions. The samples were characterized by XRD including Rietveld refinement, FESEM
and TG/DTA. Antibacterial activity was examined towards Gram-positive S. aureus and Gram-negative E. coli .
The results showed that only ZnTi-800 consisted of pure Zn2TiO4 (Fd-3m) while Zn TiO was the major phase in three other samples. In the case of samples calcined at 500 °C, traces of ZnO were found. H-ZnTi-800 contained three phases: Zn2TiO4, ZnO and Zn2Ti3O8 (P4332). Cubic Zn2TiO4 contains two cation sites: tetrahedrally coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The calculated a-parameters of all obtained Zn2TiO4 as well as Zn–O and Zn/Ti–O bond distances were independent of synthesis. At 500 °C nanocrystalline Zn2TiO4 were obtained with the crystallite sizes 26 and 71 nm for H-ZnTi-500 and ZnTi-500, respectively, while microcrystalline phases were obtained at 800 °C with the crystallite sizes larger than 110 nm. The soft agglomerates consisted of smaller particles were obtained at 500 °C comparing to samples at 800 °C having more compact agglomerates.
The best antibacterial activity with high reduction in the number of bacteria cells (87.6 % of E. coli and 63.4 % of S. aureus) was exhibited by the ZnTi-500. It means that the purity of samples, crystallite size and softness of agglomerates, influence antibacterial activity and that optimal level of all factors should be reached since ZnTi-500 was almost pure with sufficiently small crystallites and soft agglomerates.",
publisher = "European Powder Diffraction Conference (17 ; 2022 ; Šibenik)",
journal = "European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts",
title = "A novel disinfectant based on zinc orthotitanate",
pages = "206",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1969"
}

Milojković, N., Orlić, M., Dikić, J., Žunić, M., Simović, B.,& Dapčević, A.. (2022). A novel disinfectant based on zinc orthotitanate. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts
European Powder Diffraction Conference (17 ; 2022 ; Šibenik)., 206.
https://hdl.handle.net/21.15107/rcub_rimsi_1969

Milojković N, Orlić M, Dikić J, Žunić M, Simović B, Dapčević A. A novel disinfectant based on zinc orthotitanate. in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts. 2022;:206.
https://hdl.handle.net/21.15107/rcub_rimsi_1969 .

Milojković, Natalija, Orlić, Marina, Dikić, Jelena, Žunić, Milan, Simović, Bojana, Dapčević, Aleksandra, "A novel disinfectant based on zinc orthotitanate" in European Powder Diffraction Conference -ЕPDIC17, Šibenik, Croatia, Book of Abstracts (2022):206,
https://hdl.handle.net/21.15107/rcub_rimsi_1969 .

TY  - CONF
AU  - Mazumder, J.T.
AU  - Žunić, Milan
AU  - Branković, Zorica
AU  - Tripathy, S.K.
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1541
AB  - In this paper, we have investigated undoped and indium-doped titanium dioxide (TiO2) nanoparticles prepared using sol–gel method. The aim of this work is to analyse the effect of indium incorporation on the structure and morphology of the materials. X-ray diffraction (XRD) pattern reveals a significant influence of In-doping on crystallinity and average grain size of the TiO2 nanoparticles. The morphology of the nanoparticles analysed using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images confirms the formation of spherical- and triangular-shaped nanoparticles with large surface area. Further, study of TEM images confirmed the obtained XRD results. Moreover, X-ray photoelectron spectroscopy (XPS) and electron diffraction spectroscopy (EDS) approve the electronic states and composition of all different chemicals existing in the samples. All the results are found and verified with the literature.
PB  - Springer Science and Business Media Deutschland GmbH
C3  - Lecture Notes in Electrical Engineering
T1  - Structural and Morphological Properties of Indium-doped Titanium Dioxide Nanoparticles Synthesized Using Sol–gel Process
EP  - 49
SP  - 41
VL  - 781
DO  - 10.1007/978-981-16-3767-4_4
ER  - 

@conference{
author = "Mazumder, J.T. and Žunić, Milan and Branković, Zorica and Tripathy, S.K.",
year = "2022",
abstract = "In this paper, we have investigated undoped and indium-doped titanium dioxide (TiO2) nanoparticles prepared using sol–gel method. The aim of this work is to analyse the effect of indium incorporation on the structure and morphology of the materials. X-ray diffraction (XRD) pattern reveals a significant influence of In-doping on crystallinity and average grain size of the TiO2 nanoparticles. The morphology of the nanoparticles analysed using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images confirms the formation of spherical- and triangular-shaped nanoparticles with large surface area. Further, study of TEM images confirmed the obtained XRD results. Moreover, X-ray photoelectron spectroscopy (XPS) and electron diffraction spectroscopy (EDS) approve the electronic states and composition of all different chemicals existing in the samples. All the results are found and verified with the literature.",
publisher = "Springer Science and Business Media Deutschland GmbH",
journal = "Lecture Notes in Electrical Engineering",
title = "Structural and Morphological Properties of Indium-doped Titanium Dioxide Nanoparticles Synthesized Using Sol–gel Process",
pages = "49-41",
volume = "781",
doi = "10.1007/978-981-16-3767-4_4"
}

Mazumder, J.T., Žunić, M., Branković, Z.,& Tripathy, S.K.. (2022). Structural and Morphological Properties of Indium-doped Titanium Dioxide Nanoparticles Synthesized Using Sol–gel Process. in Lecture Notes in Electrical Engineering
Springer Science and Business Media Deutschland GmbH., 781, 41-49.
https://doi.org/10.1007/978-981-16-3767-4_4

Mazumder J, Žunić M, Branković Z, Tripathy S. Structural and Morphological Properties of Indium-doped Titanium Dioxide Nanoparticles Synthesized Using Sol–gel Process. in Lecture Notes in Electrical Engineering. 2022;781:41-49.
doi:10.1007/978-981-16-3767-4_4 .

Mazumder, J.T., Žunić, Milan, Branković, Zorica, Tripathy, S.K., "Structural and Morphological Properties of Indium-doped Titanium Dioxide Nanoparticles Synthesized Using Sol–gel Process" in Lecture Notes in Electrical Engineering, 781 (2022):41-49,
https://doi.org/10.1007/978-981-16-3767-4_4 . .

TY  - JOUR
AU  - Tasić, Nikola
AU  - Ćirković, Jovana
AU  - Ribić, Vesna
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
AU  - Branković, Goran
AU  - Branković, Zorica
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1517
AB  - We present the synthesis and photocatalytic properties of mixed-phase TiO2 nanoparticles decorated with silver nanodots obtained by environmental-friendly wet chemical method using low molecular weight chitosan as the silver reducing agent. Structural analysis of synthesized Ag nanoparticles revealed that they crystallized in a rare hexagonal modification. High-resolution transmission electron microscopy study shows that  lt 3-nm hexagonal-Ag nanoparticles are implanted on the surface of  lt 20-nm anatase grains. Compared to Ag-free TiO2 powders, implantation with Ag results in important increase in visible light absorption. The photocatalytic activity of the samples was measured by monitoring decolorization of concentrated textile dye solution (50 mg L-1 of Reactive Orange 16) under simulated solar irradiation of 280 W m(-2). The optimum photocatalytic properties are achieved with 5 wt% of silver. Based on the collected results, the operating mechanism of the degradation process is suggested, and the effects of the silver addition are explained.
PB  - Wiley, Hoboken
T2  - Journal of the American Ceramic Society
T1  - Effects of the silver nanodots on the photocatalytic activity of mixed-phase TiO2
EP  - 347
IS  - 1
SP  - 336
VL  - 105
DO  - 10.1111/jace.18059
ER  - 

@article{
author = "Tasić, Nikola and Ćirković, Jovana and Ribić, Vesna and Žunić, Milan and Dapčević, Aleksandra and Branković, Goran and Branković, Zorica",
year = "2022",
abstract = "We present the synthesis and photocatalytic properties of mixed-phase TiO2 nanoparticles decorated with silver nanodots obtained by environmental-friendly wet chemical method using low molecular weight chitosan as the silver reducing agent. Structural analysis of synthesized Ag nanoparticles revealed that they crystallized in a rare hexagonal modification. High-resolution transmission electron microscopy study shows that  lt 3-nm hexagonal-Ag nanoparticles are implanted on the surface of  lt 20-nm anatase grains. Compared to Ag-free TiO2 powders, implantation with Ag results in important increase in visible light absorption. The photocatalytic activity of the samples was measured by monitoring decolorization of concentrated textile dye solution (50 mg L-1 of Reactive Orange 16) under simulated solar irradiation of 280 W m(-2). The optimum photocatalytic properties are achieved with 5 wt% of silver. Based on the collected results, the operating mechanism of the degradation process is suggested, and the effects of the silver addition are explained.",
publisher = "Wiley, Hoboken",
journal = "Journal of the American Ceramic Society",
title = "Effects of the silver nanodots on the photocatalytic activity of mixed-phase TiO2",
pages = "347-336",
number = "1",
volume = "105",
doi = "10.1111/jace.18059"
}

Tasić, N., Ćirković, J., Ribić, V., Žunić, M., Dapčević, A., Branković, G.,& Branković, Z.. (2022). Effects of the silver nanodots on the photocatalytic activity of mixed-phase TiO2. in Journal of the American Ceramic Society
Wiley, Hoboken., 105(1), 336-347.
https://doi.org/10.1111/jace.18059

Tasić N, Ćirković J, Ribić V, Žunić M, Dapčević A, Branković G, Branković Z. Effects of the silver nanodots on the photocatalytic activity of mixed-phase TiO2. in Journal of the American Ceramic Society. 2022;105(1):336-347.
doi:10.1111/jace.18059 .

Tasić, Nikola, Ćirković, Jovana, Ribić, Vesna, Žunić, Milan, Dapčević, Aleksandra, Branković, Goran, Branković, Zorica, "Effects of the silver nanodots on the photocatalytic activity of mixed-phase TiO2" in Journal of the American Ceramic Society, 105, no. 1 (2022):336-347,
https://doi.org/10.1111/jace.18059 . .

TY  - JOUR
AU  - Dapčević, Aleksandra
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Počuča-Nešić, Milica
AU  - Milošević, Olivera
AU  - Branković, Goran
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1492
AB  - In this study, the possibility to stabilize O-2 ion conductors in Bi2O3-V2O5 system was investigated. Six pseudo-binary Bi2O3-V2O5 mixtures [3.50  lt  x(V2O5)  lt  8.50 mol%] were thermally treated at 1000 degrees C for 1 h. The samples were characterized by XRD, HRTEM/SAED, DTA and EIS techniques. The high-temperature reaction between alpha Bi2O3 and V2O5 resulted in formation of microcrystalline single-phase specimens containing the phase based on delta-Bi2O3 if V2O5 content was >= 4.63 mol%. The obtained phases exhibited main diffraction peaks corresponding to the simple cubic delta-Bi2O3 (space group Fm-3m) but Rietveld refinement showed a threefold repeat on a simple cubic sublattice indicating that the true unit cell is 3x3x3 supercell. Within proposed supercell, the octahedrally coordinated V5+ ions fully occupy 4a Wyckoff position and partially occupy 32f. The Bi3+ ions are placed at the rest of 32f and at 24e and 48h with full occupation. In total, 22 % of anionic sites are vacant. The ionic conductivity of phase with the lowest dopant content, i.e. Bi103V5O167, amounts 0.283 S cm(-1) at 800 degrees C with the activation energy of 0.64(5) eV, which is comparable to the undoped delta-Bi2O3 known as the fastest ion conductor.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Fast Oxide-Ion Conductors in Bi2O3-V2O5 System: Bi108-xVxO162+x(x=4-9) with 3 x 3 x 3 Superstructure
EP  - 66
IS  - 1
SP  - 55
VL  - 53
DO  - 10.2298/SOS2101055D
ER  - 

@article{
author = "Dapčević, Aleksandra and Radojković, Aleksandar and Žunić, Milan and Počuča-Nešić, Milica and Milošević, Olivera and Branković, Goran",
year = "2021",
abstract = "In this study, the possibility to stabilize O-2 ion conductors in Bi2O3-V2O5 system was investigated. Six pseudo-binary Bi2O3-V2O5 mixtures [3.50  lt  x(V2O5)  lt  8.50 mol%] were thermally treated at 1000 degrees C for 1 h. The samples were characterized by XRD, HRTEM/SAED, DTA and EIS techniques. The high-temperature reaction between alpha Bi2O3 and V2O5 resulted in formation of microcrystalline single-phase specimens containing the phase based on delta-Bi2O3 if V2O5 content was >= 4.63 mol%. The obtained phases exhibited main diffraction peaks corresponding to the simple cubic delta-Bi2O3 (space group Fm-3m) but Rietveld refinement showed a threefold repeat on a simple cubic sublattice indicating that the true unit cell is 3x3x3 supercell. Within proposed supercell, the octahedrally coordinated V5+ ions fully occupy 4a Wyckoff position and partially occupy 32f. The Bi3+ ions are placed at the rest of 32f and at 24e and 48h with full occupation. In total, 22 % of anionic sites are vacant. The ionic conductivity of phase with the lowest dopant content, i.e. Bi103V5O167, amounts 0.283 S cm(-1) at 800 degrees C with the activation energy of 0.64(5) eV, which is comparable to the undoped delta-Bi2O3 known as the fastest ion conductor.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Fast Oxide-Ion Conductors in Bi2O3-V2O5 System: Bi108-xVxO162+x(x=4-9) with 3 x 3 x 3 Superstructure",
pages = "66-55",
number = "1",
volume = "53",
doi = "10.2298/SOS2101055D"
}

Dapčević, A., Radojković, A., Žunić, M., Počuča-Nešić, M., Milošević, O.,& Branković, G.. (2021). Fast Oxide-Ion Conductors in Bi2O3-V2O5 System: Bi108-xVxO162+x(x=4-9) with 3 x 3 x 3 Superstructure. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 53(1), 55-66.
https://doi.org/10.2298/SOS2101055D

Dapčević A, Radojković A, Žunić M, Počuča-Nešić M, Milošević O, Branković G. Fast Oxide-Ion Conductors in Bi2O3-V2O5 System: Bi108-xVxO162+x(x=4-9) with 3 x 3 x 3 Superstructure. in Science of Sintering. 2021;53(1):55-66.
doi:10.2298/SOS2101055D .

Dapčević, Aleksandra, Radojković, Aleksandar, Žunić, Milan, Počuča-Nešić, Milica, Milošević, Olivera, Branković, Goran, "Fast Oxide-Ion Conductors in Bi2O3-V2O5 System: Bi108-xVxO162+x(x=4-9) with 3 x 3 x 3 Superstructure" in Science of Sintering, 53, no. 1 (2021):55-66,
https://doi.org/10.2298/SOS2101055D . .

TY  - CONF
AU  - Milojković, Natalija
AU  - Orlic, Marina
AU  - Dikić, Jelena
AU  - Žunić, Milan
AU  - Simović, Bojana
AU  - Dapčević, Aleksandra
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1992
AB  - Kontaminacija bakterijama je poslednjih godina postala problem na globalnom nivou zbog
čega se javila potreba za novim antibakterijskim agensima. Stabilni titan-
-dioksid i cink-oksid pokazuju antibakterijsku aktivnost te se smatraju pogodnim
materijalima i zbog njihove netoksičnosti i niske cene [1, 2].
Cilj ovog rada bio je dobijanje novog materijala na bazi ZnO i TiO2 sa
antibakterijskim svojstvima. U tu svrhu, titan(IV)-butoksid (25 mol.%) rastvoren je u vodenom
rastvoru cink-acetata (75 mol.%), nakon čega je dodavan amonijak dok
vrednost pH nije iznosila 8,5. Polovina dobijenog rastvora je hidrotermalno tretirana
12 h na 120 °C, zatim sušena 20 h na 100 °C i kalcinisana 1 h na 500 (uzorak H-ZnTi-500) i
800 °C (uzorak H-ZnTi-800). Druga polovina dobijenog rastvora bila je direktno sušena i
kalcinisana pod istim uslovima (uzorci ZnTi-500 i ZnTi-800).
Na osnovu XRD rezultata, fazni sastav i veličina kristalita izračunati su u Powder Cell programu,
dok su parametri jedinične ćelije i dužine veza dobijeni Ritveldovim utačnjavanjem
pomoću FullProf/Winplotr programskog paketa. Termogravimetrijskom analizom nekalcinisanih
uzoraka određena je temperatura kalcinacije. Antibakterijska aktivnost dobijenih prahova ispitana
je prema dva soja bakterija: Gram-pozitivnoj S. aureus ATCC 25923 i Gram-negativnoj E. coli
DSM 498.
Jednofazni kubni Zn2TiO4 (ICSD#162392, prostorna grupa ) dobijen je jedino u slučaju
ZnTi-800, dok je u ostale tri sinteze Zn2TiO4 bio većinska faza. Pored Zn2TiO4, uzorci
H-ZnTi-500 i ZnTi-500 sadržali su 22 i 4 mas.% ZnO (ICSD#26170) redno, dok je u uzorku
H-ZnTi-800 pronađeno 7 mas.% ZnO i 5 mas.% Zn2Ti3O8 (ICSD#083525). Parametar a svih dobijenih
Zn2TiO4 pokazao se nezavisnim od samog procesa sinteze, a dobijene vrednosti su približno
iste: 8,4465(3) za H-ZnTi-500, 8,4604(2) za ZnTi-500, 8,4564(2) za H-ZnTi-800 i 8,4565(2) Å za
ZnTi-800. U strukturi kubnog Zn2TiO4 postoje dva katjonska mesta: tetraedarski koordinirani Zn u
0,0,0, i oktaedarski koordinirani Zn i Ti koji dele položaj 5/8,5/8,5/8. Dužine veza Zn–O i Zn/Ti–
O su takođe nezavisne od uslova sinteze. Na 500 °C dobijeni su nanokristalni Zn2TiO4 (veličina
kristalita iznosila je 26 i 71 nm za H-ZnTi-500 i ZnTi-500, respektivno) dok su mikrokristalni
Zn2TiO4 nastali na 800 °C (veličina kristalita prelazila je 110 nm). Od svih uzoraka, ZnTi-500 je
pokazao najbolju antibakterijsku aktivnost dostignuvši visoki stepen redukcije broja bakterijskih
kolonija: 87,6 % E. coli DSM 498 i 63,4 % S. aureus ATCC 25923. To se može pripisati činjenici
da je u ovom slučaju dobijen gotovo jednofazni Zn2TiO4 sa dovoljno malom veličinom kristalita.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214.
AB  - In recent years bacterial contamination has become a significant problem of the global environment
causing the necessity for novel antibacterial agents. Stable,
non-toxic and low cost zinc oxide and titanium dioxide are considered as suitable
antibacterial materials [1, 2].
The aim of this work was to find a new antibacterial material based on both, ZnO and TiO2.
Therefore, titanium(IV) butoxide (25 mole%) was dissolved in a water solution of zinc acetate (75
mole%) after which the ammonia was added until pH was adjusted to 8.5. Half of the obtained
solution was hydrothermally treated for 12 h at 120 °C, dried for 20 h at 100 °C and then calcined
at 500 (sample H-ZnTi-500) and 800 °C (sample H-ZnTi-800) for 1 h. The other half of obtained
solution was directly dried and calcined under the same conditions (samples ZnTi-500 and
ZnTi-800).
Base on XRD data for obtained powders, the phase composition and crystallite size were calculated
in Powder Cell software while unit cell parameters and bond distances were obtained by
Rietveld refinement using FullProf software in Winplotr environment. TG analysis of uncalcined
samples was used to determine temperature of calcination. Antibacterial properties of obtained
powders were examined towards Gram-positive S. aureus ATCC 25923 and Gram-negative E. coli
DSM 498 bacteria.
The single-phase cubic Zn2TiO4 phase (ICSD#162392, space group ) was
obtained in the case of ZnTi-800 while, for three other samples, the Zn2TiO4 is found to be a predominant
phase. Beside Zn2TiO4 samples H-ZnTi-500 and ZnTi-500 contained 22 and 4 wt.% of
ZnO (ICSD#26170) respectively, while H-ZnTi-800 had 7 wt.% of ZnO and 5 wt.% of Zn2Ti3O8
(ICSD#083525). The a-parameter of all obtained Zn2TiO4 was independent of synthetic procedure
having following values: 8.4465(3) for H-ZnTi-500, 8.4604(2) for ZnTi-500, 8.4564(2) for
H-ZnTi-800 and 8.4565(2) Å for ZnTi-800. Two cation sites can be found in cubic Zn2TiO4: tetrahedrally
coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The
Zn–O and Zn/Ti–O bond distances were also independent of synthesis. The nanocrystalline
Zn2TiO4 phases were obtained at 500 °C (crystallite size for H-ZnTi-500 and ZnTi-500 were 26
and 71 nm respectively), and microcrystalline ones at 800 °C (the crystallite size exceeded 110
nm). Among all samples, the ZnTi-500 demonstrated the best antibacterial activity reaching high
reduction in the number of bacteria cells: 87.6 % of E. coli DSM 498 and 63.4 % of S. aureus
ATCC 25923. This could be explained by the fact that almost pure Zn2TiO4 phase was obtained
with sufficiently small crystallites.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214.
PB  - Српско кристалографско друштво, Београд, Србија; Serbian Crystallographic Society, Belgrade, Serbia
C3  - 27th Conference of the Serbian Crystallographic Society, Kragujevac
T1  - Antibacterial zinc orthotitanate
SP  - 18
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1992
ER  - 

@conference{
author = "Milojković, Natalija and Orlic, Marina and Dikić, Jelena and Žunić, Milan and Simović, Bojana and Dapčević, Aleksandra",
year = "2021",
abstract = "Kontaminacija bakterijama je poslednjih godina postala problem na globalnom nivou zbog
čega se javila potreba za novim antibakterijskim agensima. Stabilni titan-
-dioksid i cink-oksid pokazuju antibakterijsku aktivnost te se smatraju pogodnim
materijalima i zbog njihove netoksičnosti i niske cene [1, 2].
Cilj ovog rada bio je dobijanje novog materijala na bazi ZnO i TiO2 sa
antibakterijskim svojstvima. U tu svrhu, titan(IV)-butoksid (25 mol.%) rastvoren je u vodenom
rastvoru cink-acetata (75 mol.%), nakon čega je dodavan amonijak dok
vrednost pH nije iznosila 8,5. Polovina dobijenog rastvora je hidrotermalno tretirana
12 h na 120 °C, zatim sušena 20 h na 100 °C i kalcinisana 1 h na 500 (uzorak H-ZnTi-500) i
800 °C (uzorak H-ZnTi-800). Druga polovina dobijenog rastvora bila je direktno sušena i
kalcinisana pod istim uslovima (uzorci ZnTi-500 i ZnTi-800).
Na osnovu XRD rezultata, fazni sastav i veličina kristalita izračunati su u Powder Cell programu,
dok su parametri jedinične ćelije i dužine veza dobijeni Ritveldovim utačnjavanjem
pomoću FullProf/Winplotr programskog paketa. Termogravimetrijskom analizom nekalcinisanih
uzoraka određena je temperatura kalcinacije. Antibakterijska aktivnost dobijenih prahova ispitana
je prema dva soja bakterija: Gram-pozitivnoj S. aureus ATCC 25923 i Gram-negativnoj E. coli
DSM 498.
Jednofazni kubni Zn2TiO4 (ICSD#162392, prostorna grupa ) dobijen je jedino u slučaju
ZnTi-800, dok je u ostale tri sinteze Zn2TiO4 bio većinska faza. Pored Zn2TiO4, uzorci
H-ZnTi-500 i ZnTi-500 sadržali su 22 i 4 mas.% ZnO (ICSD#26170) redno, dok je u uzorku
H-ZnTi-800 pronađeno 7 mas.% ZnO i 5 mas.% Zn2Ti3O8 (ICSD#083525). Parametar a svih dobijenih
Zn2TiO4 pokazao se nezavisnim od samog procesa sinteze, a dobijene vrednosti su približno
iste: 8,4465(3) za H-ZnTi-500, 8,4604(2) za ZnTi-500, 8,4564(2) za H-ZnTi-800 i 8,4565(2) Å za
ZnTi-800. U strukturi kubnog Zn2TiO4 postoje dva katjonska mesta: tetraedarski koordinirani Zn u
0,0,0, i oktaedarski koordinirani Zn i Ti koji dele položaj 5/8,5/8,5/8. Dužine veza Zn–O i Zn/Ti–
O su takođe nezavisne od uslova sinteze. Na 500 °C dobijeni su nanokristalni Zn2TiO4 (veličina
kristalita iznosila je 26 i 71 nm za H-ZnTi-500 i ZnTi-500, respektivno) dok su mikrokristalni
Zn2TiO4 nastali na 800 °C (veličina kristalita prelazila je 110 nm). Od svih uzoraka, ZnTi-500 je
pokazao najbolju antibakterijsku aktivnost dostignuvši visoki stepen redukcije broja bakterijskih
kolonija: 87,6 % E. coli DSM 498 i 63,4 % S. aureus ATCC 25923. To se može pripisati činjenici
da je u ovom slučaju dobijen gotovo jednofazni Zn2TiO4 sa dovoljno malom veličinom kristalita.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214., In recent years bacterial contamination has become a significant problem of the global environment
causing the necessity for novel antibacterial agents. Stable,
non-toxic and low cost zinc oxide and titanium dioxide are considered as suitable
antibacterial materials [1, 2].
The aim of this work was to find a new antibacterial material based on both, ZnO and TiO2.
Therefore, titanium(IV) butoxide (25 mole%) was dissolved in a water solution of zinc acetate (75
mole%) after which the ammonia was added until pH was adjusted to 8.5. Half of the obtained
solution was hydrothermally treated for 12 h at 120 °C, dried for 20 h at 100 °C and then calcined
at 500 (sample H-ZnTi-500) and 800 °C (sample H-ZnTi-800) for 1 h. The other half of obtained
solution was directly dried and calcined under the same conditions (samples ZnTi-500 and
ZnTi-800).
Base on XRD data for obtained powders, the phase composition and crystallite size were calculated
in Powder Cell software while unit cell parameters and bond distances were obtained by
Rietveld refinement using FullProf software in Winplotr environment. TG analysis of uncalcined
samples was used to determine temperature of calcination. Antibacterial properties of obtained
powders were examined towards Gram-positive S. aureus ATCC 25923 and Gram-negative E. coli
DSM 498 bacteria.
The single-phase cubic Zn2TiO4 phase (ICSD#162392, space group ) was
obtained in the case of ZnTi-800 while, for three other samples, the Zn2TiO4 is found to be a predominant
phase. Beside Zn2TiO4 samples H-ZnTi-500 and ZnTi-500 contained 22 and 4 wt.% of
ZnO (ICSD#26170) respectively, while H-ZnTi-800 had 7 wt.% of ZnO and 5 wt.% of Zn2Ti3O8
(ICSD#083525). The a-parameter of all obtained Zn2TiO4 was independent of synthetic procedure
having following values: 8.4465(3) for H-ZnTi-500, 8.4604(2) for ZnTi-500, 8.4564(2) for
H-ZnTi-800 and 8.4565(2) Å for ZnTi-800. Two cation sites can be found in cubic Zn2TiO4: tetrahedrally
coordinated Zn at 0,0,0 and octahedral site at 5/8,5/8,5/8 shared between Zn and Ti. The
Zn–O and Zn/Ti–O bond distances were also independent of synthesis. The nanocrystalline
Zn2TiO4 phases were obtained at 500 °C (crystallite size for H-ZnTi-500 and ZnTi-500 were 26
and 71 nm respectively), and microcrystalline ones at 800 °C (the crystallite size exceeded 110
nm). Among all samples, the ZnTi-500 demonstrated the best antibacterial activity reaching high
reduction in the number of bacteria cells: 87.6 % of E. coli DSM 498 and 63.4 % of S. aureus
ATCC 25923. This could be explained by the fact that almost pure Zn2TiO4 phase was obtained
with sufficiently small crystallites.
[1] A. Sirelkhatim et al., Nano-Micro Letters, 7 (2015) 219–242.
[2] T. Matsunaga et al., FEMS Microbiology Letters, 29 (1985) 211–214.",
publisher = "Српско кристалографско друштво, Београд, Србија; Serbian Crystallographic Society, Belgrade, Serbia",
journal = "27th Conference of the Serbian Crystallographic Society, Kragujevac",
title = "Antibacterial zinc orthotitanate",
pages = "18",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1992"
}

Milojković, N., Orlic, M., Dikić, J., Žunić, M., Simović, B.,& Dapčević, A.. (2021). Antibacterial zinc orthotitanate. in 27th Conference of the Serbian Crystallographic Society, Kragujevac
Српско кристалографско друштво, Београд, Србија; Serbian Crystallographic Society, Belgrade, Serbia., 18.
https://hdl.handle.net/21.15107/rcub_rimsi_1992

Milojković N, Orlic M, Dikić J, Žunić M, Simović B, Dapčević A. Antibacterial zinc orthotitanate. in 27th Conference of the Serbian Crystallographic Society, Kragujevac. 2021;:18.
https://hdl.handle.net/21.15107/rcub_rimsi_1992 .

Milojković, Natalija, Orlic, Marina, Dikić, Jelena, Žunić, Milan, Simović, Bojana, Dapčević, Aleksandra, "Antibacterial zinc orthotitanate" in 27th Conference of the Serbian Crystallographic Society, Kragujevac (2021):18,
https://hdl.handle.net/21.15107/rcub_rimsi_1992 .

TY  - JOUR
AU  - Mazumder, Julaiba Tahsina
AU  - Lenka, T. R.
AU  - Žunić, Milan
AU  - Branković, Zorica
AU  - Tripathy, S. K.
AU  - Menon, P. S.
AU  - Lin, F.
AU  - Aberle, A. G.
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1483
AB  - First principle calculations on pure and germanium (Ge) incorporated tin (IV) oxide (SnO2) are performed to understand their structural, electronic, and optical properties at the microscopic level. The optimized ground state structures exhibited a reduction in their lattice parameters as well as total energy with increasing germanium concentration. From the band structures of the pristine and doped SnO2, we have observed a reduction in the energy gap due to the incorporation of germanium into stannic oxide (SnO2). As conduction band minimum near Fermi level reaching a lower energy level with an increase in doping concentration, the electron affinity is increasing. The calculated band gaps of pure, 6.25 %, 12.5 % and 25 % 'Ge' incorporated tin (IV) oxides are 1.76, 1.73, 1.56 and 1.53 eV, respectively, and all are direct in nature. Further, the calculated electron effective mass at the conduction band minimum is lower than the hole effective mass at the valence band maximum. Hence, the mobility of electrons is found to be higher, suggesting the n-type semiconducting property. The contributions of different atoms on valence and conduction band are studied by calculating the density of states spectra. Optical properties, such as real and imaginary dielectric constants, absorption, reflectivity, refraction and extinction coefficient, loss function, real and imaginary optical conductivity are calculated. The calculated optical absorption shows that both un-doped and doped materials preserve the optical transparency in the infra-red region. Our analysis shows that Ge-doped SnO2 has a tunable band gap and work function, which makes it suitable for applications in photovoltaic devices.
PB  - Elsevier, Amsterdam
T2  - Materials Today Communications
T1  - First principle study on structural and optoelectronic properties and band-gap modulation in germanium incorporated tin (IV) oxide
VL  - 27
DO  - 10.1016/j.mtcomm.2021.102393
ER  - 

@article{
author = "Mazumder, Julaiba Tahsina and Lenka, T. R. and Žunić, Milan and Branković, Zorica and Tripathy, S. K. and Menon, P. S. and Lin, F. and Aberle, A. G.",
year = "2021",
abstract = "First principle calculations on pure and germanium (Ge) incorporated tin (IV) oxide (SnO2) are performed to understand their structural, electronic, and optical properties at the microscopic level. The optimized ground state structures exhibited a reduction in their lattice parameters as well as total energy with increasing germanium concentration. From the band structures of the pristine and doped SnO2, we have observed a reduction in the energy gap due to the incorporation of germanium into stannic oxide (SnO2). As conduction band minimum near Fermi level reaching a lower energy level with an increase in doping concentration, the electron affinity is increasing. The calculated band gaps of pure, 6.25 %, 12.5 % and 25 % 'Ge' incorporated tin (IV) oxides are 1.76, 1.73, 1.56 and 1.53 eV, respectively, and all are direct in nature. Further, the calculated electron effective mass at the conduction band minimum is lower than the hole effective mass at the valence band maximum. Hence, the mobility of electrons is found to be higher, suggesting the n-type semiconducting property. The contributions of different atoms on valence and conduction band are studied by calculating the density of states spectra. Optical properties, such as real and imaginary dielectric constants, absorption, reflectivity, refraction and extinction coefficient, loss function, real and imaginary optical conductivity are calculated. The calculated optical absorption shows that both un-doped and doped materials preserve the optical transparency in the infra-red region. Our analysis shows that Ge-doped SnO2 has a tunable band gap and work function, which makes it suitable for applications in photovoltaic devices.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Today Communications",
title = "First principle study on structural and optoelectronic properties and band-gap modulation in germanium incorporated tin (IV) oxide",
volume = "27",
doi = "10.1016/j.mtcomm.2021.102393"
}

Mazumder, J. T., Lenka, T. R., Žunić, M., Branković, Z., Tripathy, S. K., Menon, P. S., Lin, F.,& Aberle, A. G.. (2021). First principle study on structural and optoelectronic properties and band-gap modulation in germanium incorporated tin (IV) oxide. in Materials Today Communications
Elsevier, Amsterdam., 27.
https://doi.org/10.1016/j.mtcomm.2021.102393

Mazumder JT, Lenka TR, Žunić M, Branković Z, Tripathy SK, Menon PS, Lin F, Aberle AG. First principle study on structural and optoelectronic properties and band-gap modulation in germanium incorporated tin (IV) oxide. in Materials Today Communications. 2021;27.
doi:10.1016/j.mtcomm.2021.102393 .

Mazumder, Julaiba Tahsina, Lenka, T. R., Žunić, Milan, Branković, Zorica, Tripathy, S. K., Menon, P. S., Lin, F., Aberle, A. G., "First principle study on structural and optoelectronic properties and band-gap modulation in germanium incorporated tin (IV) oxide" in Materials Today Communications, 27 (2021),
https://doi.org/10.1016/j.mtcomm.2021.102393 . .

TY  - CONF
AU  - Petričević, Aleksandar
AU  - Malešević, Aleksandar
AU  - Radojković, Aleksandar
AU  - Dapčević, Aleksandra
AU  - Žunić, Milan
PY  - 2020
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2406
AB  - Regarding limited fossil energy resources and
hence the increasing demands for new highly efficient
and environmentally friendly energy conversion
devices, the widespread use of solid oxide fuel cells
(SOFCs) might become a keystone in near future. An
SOFC is consisted of dense electrolyte which is
sandwiched between two porous electrodes. Since the
electrolyte is the most important part of an SOFC,
oxide ion conductors applicable in SOFCs became the
hot topic of modern research. The main requirement is
to find a stable dense electrolyte material with
increased conductivity at intermediate temperature. Two commercial electrolytes, yttria stabilized
zirconia (YSZ) and gadolinia doped ceria (GDC), are far to be ideal. The use of YSZ requires operating
temperatures above 1000 °C while devices based on GDC are not efficient enough due to GDC lower
conductivity at intermediate temperatures.
The best candidate for an electrolyte in intermediate temperature SOFCs is undoubtedly fluorite
structured bismuth oxide, i.e. δ-Bi2O3, being the fastest known ionic conductor. However, this material is
unstable upon heating/cooling but the use of dopant, such as Tm, led to the impressive stability and high
conductivity at intermediate temperatures [1]. Our findings indicated that Lu-doped δ-Bi2O3 could show
even better performances since Lu is smaller and more rigid dopant than Tm.
In this study, the possibility to stabilize -Bi2O3 in Bi2O3–Lu2O3 system was investigated. Two
starting mixtures of α-Bi2O3 and Lu2O3 with the following compositions (Bi1–xLux)2O3, x = 0.20 and 0.25,
were dry homogenized in an agate mortar, heat treated at 750 °C for 3 h and then slowly cooled. The
obtain powders were characterized by XRD and DTA techniques. Based on these results, the targeted
cubic single-phase δ-Bi2O3 was successfully obtained within both systems. The unit cell parameter of
obtained Lu-doped -Bi2O3 decreases as the dopant content increases, as expected since Lu3+ is smaller
cation than Bi3+. According to cyclic DTA curves, no phase transitions (25 – 980 °C) were observed for
both phases, (Bi0.8Lu0.2)2O3 and (Bi0.75Lu0.25)2O3, indicating that these -Bi2O3 phases are stable.
Afterwards, half of obtained quantity of each powder was mechanochemically treated (in
planetary ball mill Retsch PM-100) in order to decrease the crystallite size. Namely, before performing
EIS measurements the powders undergo to pressing and then sintering to obtain dense ceramic pellets.
This is also important for their future application in SOFC since the density of almost 100% is mandatory
in order to avoid the direct contact of air (oxygen) and fuel (hydrogen). The density of sintered pellets
obtained from both untreated and mechanochemically treated powders will be compared. Using EIS
technique, the ionic conductivity will be measured for the samples having the highest density. We expect
that these materials will exhibit the conductivities which are higher than those obtained for Tm-doped
-Bi2O3 (0.1 – 0.4 S cm–1 at 550 – 800 °C).
Such stability and extraordinary conductivity would open the possibility for application of
(Bi0.8Lu0.2)2O3 and (Bi0.75Lu0.25)2O3, which could result in the significant enhancement of electrochemical
performance of intermediate temperature SOFCs but also in their good stability over long time service.
C3  - ISE Annual Meeting
T1  - Solid state ionic conductors based on Lu-doped δ-Bi2O3
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2406
ER  - 

@conference{
author = "Petričević, Aleksandar and Malešević, Aleksandar and Radojković, Aleksandar and Dapčević, Aleksandra and Žunić, Milan",
year = "2020",
abstract = "Regarding limited fossil energy resources and
hence the increasing demands for new highly efficient
and environmentally friendly energy conversion
devices, the widespread use of solid oxide fuel cells
(SOFCs) might become a keystone in near future. An
SOFC is consisted of dense electrolyte which is
sandwiched between two porous electrodes. Since the
electrolyte is the most important part of an SOFC,
oxide ion conductors applicable in SOFCs became the
hot topic of modern research. The main requirement is
to find a stable dense electrolyte material with
increased conductivity at intermediate temperature. Two commercial electrolytes, yttria stabilized
zirconia (YSZ) and gadolinia doped ceria (GDC), are far to be ideal. The use of YSZ requires operating
temperatures above 1000 °C while devices based on GDC are not efficient enough due to GDC lower
conductivity at intermediate temperatures.
The best candidate for an electrolyte in intermediate temperature SOFCs is undoubtedly fluorite
structured bismuth oxide, i.e. δ-Bi2O3, being the fastest known ionic conductor. However, this material is
unstable upon heating/cooling but the use of dopant, such as Tm, led to the impressive stability and high
conductivity at intermediate temperatures [1]. Our findings indicated that Lu-doped δ-Bi2O3 could show
even better performances since Lu is smaller and more rigid dopant than Tm.
In this study, the possibility to stabilize -Bi2O3 in Bi2O3–Lu2O3 system was investigated. Two
starting mixtures of α-Bi2O3 and Lu2O3 with the following compositions (Bi1–xLux)2O3, x = 0.20 and 0.25,
were dry homogenized in an agate mortar, heat treated at 750 °C for 3 h and then slowly cooled. The
obtain powders were characterized by XRD and DTA techniques. Based on these results, the targeted
cubic single-phase δ-Bi2O3 was successfully obtained within both systems. The unit cell parameter of
obtained Lu-doped -Bi2O3 decreases as the dopant content increases, as expected since Lu3+ is smaller
cation than Bi3+. According to cyclic DTA curves, no phase transitions (25 – 980 °C) were observed for
both phases, (Bi0.8Lu0.2)2O3 and (Bi0.75Lu0.25)2O3, indicating that these -Bi2O3 phases are stable.
Afterwards, half of obtained quantity of each powder was mechanochemically treated (in
planetary ball mill Retsch PM-100) in order to decrease the crystallite size. Namely, before performing
EIS measurements the powders undergo to pressing and then sintering to obtain dense ceramic pellets.
This is also important for their future application in SOFC since the density of almost 100% is mandatory
in order to avoid the direct contact of air (oxygen) and fuel (hydrogen). The density of sintered pellets
obtained from both untreated and mechanochemically treated powders will be compared. Using EIS
technique, the ionic conductivity will be measured for the samples having the highest density. We expect
that these materials will exhibit the conductivities which are higher than those obtained for Tm-doped
-Bi2O3 (0.1 – 0.4 S cm–1 at 550 – 800 °C).
Such stability and extraordinary conductivity would open the possibility for application of
(Bi0.8Lu0.2)2O3 and (Bi0.75Lu0.25)2O3, which could result in the significant enhancement of electrochemical
performance of intermediate temperature SOFCs but also in their good stability over long time service.",
journal = "ISE Annual Meeting",
title = "Solid state ionic conductors based on Lu-doped δ-Bi2O3",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2406"
}

Petričević, A., Malešević, A., Radojković, A., Dapčević, A.,& Žunić, M.. (2020). Solid state ionic conductors based on Lu-doped δ-Bi2O3. in ISE Annual Meeting.
https://hdl.handle.net/21.15107/rcub_rimsi_2406

Petričević A, Malešević A, Radojković A, Dapčević A, Žunić M. Solid state ionic conductors based on Lu-doped δ-Bi2O3. in ISE Annual Meeting. 2020;.
https://hdl.handle.net/21.15107/rcub_rimsi_2406 .

Petričević, Aleksandar, Malešević, Aleksandar, Radojković, Aleksandar, Dapčević, Aleksandra, Žunić, Milan, "Solid state ionic conductors based on Lu-doped δ-Bi2O3" in ISE Annual Meeting (2020),
https://hdl.handle.net/21.15107/rcub_rimsi_2406 .

TY  - CONF
AU  - Tasić, Nikola
AU  - Ćirković, Jovana
AU  - Žunić, Milan
AU  - Ribić, Vesna
AU  - Dapčević, Aleksandra
AU  - Curkovic, Lidija
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2947
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - The book of Abstract / 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019,June 11-13, 2019, Belgrade, Serbia, 2019
T1  - Ag/TiO2 nanocomposite materials for application in visiblelight - photocatalysis
SP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2947
ER  - 

@conference{
author = "Tasić, Nikola and Ćirković, Jovana and Žunić, Milan and Ribić, Vesna and Dapčević, Aleksandra and Curkovic, Lidija and Branković, Zorica and Branković, Goran",
year = "2019",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "The book of Abstract / 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019,June 11-13, 2019, Belgrade, Serbia, 2019",
title = "Ag/TiO2 nanocomposite materials for application in visiblelight - photocatalysis",
pages = "123",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2947"
}

Tasić, N., Ćirković, J., Žunić, M., Ribić, V., Dapčević, A., Curkovic, L., Branković, Z.,& Branković, G.. (2019). Ag/TiO2 nanocomposite materials for application in visiblelight - photocatalysis. in The book of Abstract / 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019,June 11-13, 2019, Belgrade, Serbia, 2019
University of Belgrade, Institute for Multidisciplinary Research., 123.
https://hdl.handle.net/21.15107/rcub_rimsi_2947

Tasić N, Ćirković J, Žunić M, Ribić V, Dapčević A, Curkovic L, Branković Z, Branković G. Ag/TiO2 nanocomposite materials for application in visiblelight - photocatalysis. in The book of Abstract / 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019,June 11-13, 2019, Belgrade, Serbia, 2019. 2019;:123.
https://hdl.handle.net/21.15107/rcub_rimsi_2947 .

Tasić, Nikola, Ćirković, Jovana, Žunić, Milan, Ribić, Vesna, Dapčević, Aleksandra, Curkovic, Lidija, Branković, Zorica, Branković, Goran, "Ag/TiO2 nanocomposite materials for application in visiblelight - photocatalysis" in The book of Abstract / 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019,June 11-13, 2019, Belgrade, Serbia, 2019 (2019):123,
https://hdl.handle.net/21.15107/rcub_rimsi_2947 .

TY  - CONF
AU  - Ahmetović, Sanita
AU  - Tasić, Nikola
AU  - Žunić, Milan
AU  - Dapčević, Aleksandra
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2474
AB  - In this work we present detailed optimization of the titania-based electrospun
nanofibers fabrication procedure. The starting solutions were prepared from
stabilized titanium (IV) isopropoxide and different polymers, such as PCL
(polycaprolactone) and PVP (polyvinylpyrrolidone). We report on the correlation
between the processing parameters and functional properties of as synthesized
fibers. Microstructural analyses performed on SEM and FE-SEM have revealed
branchy morphology of nanofibers uniform in shape and size. Anatase phase in as
prepared and calcined samples was disclosed by in-depth analysis of TEM images
and SAED spectra. The obtained fibers were used in UV/Vis photocatalytic reactor
for degradation of dye-contaminated water solutions. Promising results were
observed showing improved behavior compared to referent samples. Furthermore,
the influence of various dopants on the photocatalytic properties was investigated.
PB  - Institute for Multidisciplinary Research, University of Belgrade Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - Programme and the Book of Abstracts 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - TITANIA-BASED ELECTROSPUN NANOFIBERS AND THEIR PHOTOCATALYTIC PERFORMANCE
SP  - 123/P-56
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2474
ER  - 

@conference{
author = "Ahmetović, Sanita and Tasić, Nikola and Žunić, Milan and Dapčević, Aleksandra and Branković, Zorica and Branković, Goran",
year = "2019",
abstract = "In this work we present detailed optimization of the titania-based electrospun
nanofibers fabrication procedure. The starting solutions were prepared from
stabilized titanium (IV) isopropoxide and different polymers, such as PCL
(polycaprolactone) and PVP (polyvinylpyrrolidone). We report on the correlation
between the processing parameters and functional properties of as synthesized
fibers. Microstructural analyses performed on SEM and FE-SEM have revealed
branchy morphology of nanofibers uniform in shape and size. Anatase phase in as
prepared and calcined samples was disclosed by in-depth analysis of TEM images
and SAED spectra. The obtained fibers were used in UV/Vis photocatalytic reactor
for degradation of dye-contaminated water solutions. Promising results were
observed showing improved behavior compared to referent samples. Furthermore,
the influence of various dopants on the photocatalytic properties was investigated.",
publisher = "Institute for Multidisciplinary Research, University of Belgrade Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "Programme and the Book of Abstracts 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "TITANIA-BASED ELECTROSPUN NANOFIBERS AND THEIR PHOTOCATALYTIC PERFORMANCE",
pages = "123/P-56",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2474"
}

Ahmetović, S., Tasić, N., Žunić, M., Dapčević, A., Branković, Z.,& Branković, G.. (2019). TITANIA-BASED ELECTROSPUN NANOFIBERS AND THEIR PHOTOCATALYTIC PERFORMANCE. in Programme and the Book of Abstracts 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
Institute for Multidisciplinary Research, University of Belgrade Kneza Višeslava 1, 11000 Belgrade, Serbia., 123/P-56.
https://hdl.handle.net/21.15107/rcub_rimsi_2474

Ahmetović S, Tasić N, Žunić M, Dapčević A, Branković Z, Branković G. TITANIA-BASED ELECTROSPUN NANOFIBERS AND THEIR PHOTOCATALYTIC PERFORMANCE. in Programme and the Book of Abstracts 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:123/P-56.
https://hdl.handle.net/21.15107/rcub_rimsi_2474 .

Ahmetović, Sanita, Tasić, Nikola, Žunić, Milan, Dapčević, Aleksandra, Branković, Zorica, Branković, Goran, "TITANIA-BASED ELECTROSPUN NANOFIBERS AND THEIR PHOTOCATALYTIC PERFORMANCE" in Programme and the Book of Abstracts 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):123/P-56,
https://hdl.handle.net/21.15107/rcub_rimsi_2474 .

TY  - CONF
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Savic, Slavica
AU  - Perać, Sanja
AU  - Vojisavljević, Katarina
AU  - Luković Golić, Danijela
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2307
AB  - Composition of BaCe0.9Y0.1O3-δ was changed by co-doping with 5 mole % of different cations (In3+, Zr4+ and Nb5+) to examine the influence of dopants on the electrolyte properties. The powder samples were synthesized by the citric-nitric autocombustion method. BaCe0.85Y0.1In0.05O3-δ was successfully sintered at 1400 °C for 5 h in air, while a complete sintering of the other materials was carried out at 1550 °C. This makes the doping with In a preferable method since sintering temperatures below 1500 °C can limit BaO evaporation. The presence of In and Nb caused a significant drop in the total conductivity (σ) of the ceramics at 700 °C in wet hydrogen, while the total conductivity of BaCe0.85Y0.1Zr0.05O3-δ was slightly lower than of BaCe0.9Y0.1O3-δ. The stability of the ceramics exposed to a 100 % CO2 atmosphere at 700 °C for 5 h was investigated by X-ray analysis.
BaCe0.85Y0.1In0.05O3-δ showed considerable stability under the aggressive conditions containing traces of secondary phases, while the other samples were partially or significantly decomposed. By taking into account the factors that can influence the stability and conductivity, it was found that the dopant electronegativity had a
decisive role both in inhibiting the carbonation and in decreasing the total conductivity of the ceramics.
PB  - Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia
C3  - 5th Conference of the Serbian Society for Ceramic Materials
T1  - Adjusting the electrolyte properties of BaCe0.9Y0.1O3–δ by co-doping
SP  - 131
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2307
ER  - 

@conference{
author = "Radojković, Aleksandar and Žunić, Milan and Savic, Slavica and Perać, Sanja and Vojisavljević, Katarina and Luković Golić, Danijela and Branković, Zorica and Branković, Goran",
year = "2019",
abstract = "Composition of BaCe0.9Y0.1O3-δ was changed by co-doping with 5 mole % of different cations (In3+, Zr4+ and Nb5+) to examine the influence of dopants on the electrolyte properties. The powder samples were synthesized by the citric-nitric autocombustion method. BaCe0.85Y0.1In0.05O3-δ was successfully sintered at 1400 °C for 5 h in air, while a complete sintering of the other materials was carried out at 1550 °C. This makes the doping with In a preferable method since sintering temperatures below 1500 °C can limit BaO evaporation. The presence of In and Nb caused a significant drop in the total conductivity (σ) of the ceramics at 700 °C in wet hydrogen, while the total conductivity of BaCe0.85Y0.1Zr0.05O3-δ was slightly lower than of BaCe0.9Y0.1O3-δ. The stability of the ceramics exposed to a 100 % CO2 atmosphere at 700 °C for 5 h was investigated by X-ray analysis.
BaCe0.85Y0.1In0.05O3-δ showed considerable stability under the aggressive conditions containing traces of secondary phases, while the other samples were partially or significantly decomposed. By taking into account the factors that can influence the stability and conductivity, it was found that the dopant electronegativity had a
decisive role both in inhibiting the carbonation and in decreasing the total conductivity of the ceramics.",
publisher = "Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia",
journal = "5th Conference of the Serbian Society for Ceramic Materials",
title = "Adjusting the electrolyte properties of BaCe0.9Y0.1O3–δ by co-doping",
pages = "131",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2307"
}

Radojković, A., Žunić, M., Savic, S., Perać, S., Vojisavljević, K., Luković Golić, D., Branković, Z.,& Branković, G.. (2019). Adjusting the electrolyte properties of BaCe0.9Y0.1O3–δ by co-doping. in 5th Conference of the Serbian Society for Ceramic Materials
Institut za multidisciplinarna istraživanja Kneza Višeslava 1, 11000 Belgrade, Serbia., 131.
https://hdl.handle.net/21.15107/rcub_rimsi_2307

Radojković A, Žunić M, Savic S, Perać S, Vojisavljević K, Luković Golić D, Branković Z, Branković G. Adjusting the electrolyte properties of BaCe0.9Y0.1O3–δ by co-doping. in 5th Conference of the Serbian Society for Ceramic Materials. 2019;:131.
https://hdl.handle.net/21.15107/rcub_rimsi_2307 .

Radojković, Aleksandar, Žunić, Milan, Savic, Slavica, Perać, Sanja, Vojisavljević, Katarina, Luković Golić, Danijela, Branković, Zorica, Branković, Goran, "Adjusting the electrolyte properties of BaCe0.9Y0.1O3–δ by co-doping" in 5th Conference of the Serbian Society for Ceramic Materials (2019):131,
https://hdl.handle.net/21.15107/rcub_rimsi_2307 .

TY  - JOUR
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Savić, Slavica M.
AU  - Perać, Sanja
AU  - Luković Golić, Danijela
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2019
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1275
AB  - The properties of single-doped BaCe0.9Y0.1O3-delta and materials co-doped with 5 mol % of different cations (In3+, Zr4+ and Nb5+) with the general formula BaCe0.85Y0.1M0.05O3-delta were compared to examine the influence of dopants on the electrolyte properties. The samples were synthesized by the citric-nitric autocombustion method. BaCe0.85Y0.1In0.05O3-delta was successfully sintered at 1400 degrees C for 5 h in air, while a complete sintering of the other materials was carried out at 1550 degrees C. This makes the doping with In a preferable method since sintering temperatures below 1500 degrees C can limit BaO evaporation. The total conductivities (sigma) calculated from the electrical measurements at 700 degrees C in wet hydrogen decreased in the following order: BaCe0.9Y0.1O3-delta > BaCe0.85Y0.1Zr0.05O3-delta > BaCe0.85Y0.1Nb0.05O3-delta > BaCe0.85Y0.1In0.05O3-delta. The stability of the ceramics exposed to a 100% CO2 atmosphere at 700 degrees C for 5 h was examined by X-ray analysis. It was observed that only BaCe0.85Y0.1In0.05O3-delta could sustain the aggressive environment containing traces of secondary phases, while the other samples were partially or significantly decomposed. By taking into account the values of the Goldschmidt tolerance factor (t) and dopant electronegativity (chi), it was found that the dopant electronegativity had a decisive role in inhibiting the carbonation of the ceramics.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Co-doping as a strategy for tailoring the electrolyte properties of BaCe0.9Y0.1O3-delta
EP  - 8285
IS  - 7
SP  - 8279
VL  - 45
DO  - 10.1016/j.ceramint.2019.01.134
ER  - 

@article{
author = "Radojković, Aleksandar and Žunić, Milan and Savić, Slavica M. and Perać, Sanja and Luković Golić, Danijela and Branković, Zorica and Branković, Goran",
year = "2019",
abstract = "The properties of single-doped BaCe0.9Y0.1O3-delta and materials co-doped with 5 mol % of different cations (In3+, Zr4+ and Nb5+) with the general formula BaCe0.85Y0.1M0.05O3-delta were compared to examine the influence of dopants on the electrolyte properties. The samples were synthesized by the citric-nitric autocombustion method. BaCe0.85Y0.1In0.05O3-delta was successfully sintered at 1400 degrees C for 5 h in air, while a complete sintering of the other materials was carried out at 1550 degrees C. This makes the doping with In a preferable method since sintering temperatures below 1500 degrees C can limit BaO evaporation. The total conductivities (sigma) calculated from the electrical measurements at 700 degrees C in wet hydrogen decreased in the following order: BaCe0.9Y0.1O3-delta > BaCe0.85Y0.1Zr0.05O3-delta > BaCe0.85Y0.1Nb0.05O3-delta > BaCe0.85Y0.1In0.05O3-delta. The stability of the ceramics exposed to a 100% CO2 atmosphere at 700 degrees C for 5 h was examined by X-ray analysis. It was observed that only BaCe0.85Y0.1In0.05O3-delta could sustain the aggressive environment containing traces of secondary phases, while the other samples were partially or significantly decomposed. By taking into account the values of the Goldschmidt tolerance factor (t) and dopant electronegativity (chi), it was found that the dopant electronegativity had a decisive role in inhibiting the carbonation of the ceramics.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Co-doping as a strategy for tailoring the electrolyte properties of BaCe0.9Y0.1O3-delta",
pages = "8285-8279",
number = "7",
volume = "45",
doi = "10.1016/j.ceramint.2019.01.134"
}

Radojković, A., Žunić, M., Savić, S. M., Perać, S., Luković Golić, D., Branković, Z.,& Branković, G.. (2019). Co-doping as a strategy for tailoring the electrolyte properties of BaCe0.9Y0.1O3-delta. in Ceramics International
Elsevier Sci Ltd, Oxford., 45(7), 8279-8285.
https://doi.org/10.1016/j.ceramint.2019.01.134

Radojković A, Žunić M, Savić SM, Perać S, Luković Golić D, Branković Z, Branković G. Co-doping as a strategy for tailoring the electrolyte properties of BaCe0.9Y0.1O3-delta. in Ceramics International. 2019;45(7):8279-8285.
doi:10.1016/j.ceramint.2019.01.134 .

Radojković, Aleksandar, Žunić, Milan, Savić, Slavica M., Perać, Sanja, Luković Golić, Danijela, Branković, Zorica, Branković, Goran, "Co-doping as a strategy for tailoring the electrolyte properties of BaCe0.9Y0.1O3-delta" in Ceramics International, 45, no. 7 (2019):8279-8285,
https://doi.org/10.1016/j.ceramint.2019.01.134 . .

TY  - CONF
AU  - Tasić, Nikola
AU  - Ćirković, Jovana
AU  - Dapčević, Aleksandra
AU  - Curkovic, Lidija
AU  - Ribić, Vesna
AU  - Žunić, Milan
AU  - Branković, Goran
AU  - Branković, Zorica
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2955
AB  - In this work we present simple chemical method for preparation of Ag/TiO2 nanoparticle
composites and investigate their photocatalytic performance under visible and UV-enriched
irradiation sources. The coupling of metallic additives with TiO2 (anatase, rutile or mixed
phase tetragonal structures), results in extension of the absorption range, higher utilization
of the visible light, and might lead to the faster photocatalytic degradation of pollutants, due
to more efficient charge separation. Proposed method involves usage of chitosan, a bioderived polysaccharide rarely utilized in ceramics-related research, which serves as both
stabilizing and reducing agent. We present thorough characterization of the structural,
textural and optical properties, performed on the obtained powders by the means of FESEM, TEM, XRD, SAED, BET and UV-VIS-NIR spectroscopy. Microscopical analysis revealed
the reduction of TiO2 particles size, upon the introduction of silver into the system, and
presence of sub-10 nm TiO2 particles decorated with sub-3 nm Ag dots in the composite
samples (0-15wt% of Ag). Structural analysis disclosed pure or predominant presence of
anatase crystallographic phase. Higher surface area compared to commercial referent
samples was obtained. Also, the enhancement of visible light absorption was detected in the
composite samples, compared to pure TiO2. The photocatalytic degradation of textile azo
dye (Reactive Orange 16) and antibiotic (Nutrofurantoin) was investigated, showing very
high adsorption capability of the powders, and superior photocatalytic behaviour compared
to referent samples.
PB  - CROATIAN ACADEMY OF SCIENCIES AND ARTS CROATIAN CRYSTALLOGRAPHIC ASSOCIATION ZAGREB, CROATIA
C3  - The Book of Abstracts / The 26th Croatian-Slovenian Crystallographic Meeting, Poreč, Croatia, June 13-17,2018.
T1  - Ag/TiO2 nanoparticle composites and their photocatalytic performance
SP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2955
ER  - 

@conference{
author = "Tasić, Nikola and Ćirković, Jovana and Dapčević, Aleksandra and Curkovic, Lidija and Ribić, Vesna and Žunić, Milan and Branković, Goran and Branković, Zorica",
year = "2018",
abstract = "In this work we present simple chemical method for preparation of Ag/TiO2 nanoparticle
composites and investigate their photocatalytic performance under visible and UV-enriched
irradiation sources. The coupling of metallic additives with TiO2 (anatase, rutile or mixed
phase tetragonal structures), results in extension of the absorption range, higher utilization
of the visible light, and might lead to the faster photocatalytic degradation of pollutants, due
to more efficient charge separation. Proposed method involves usage of chitosan, a bioderived polysaccharide rarely utilized in ceramics-related research, which serves as both
stabilizing and reducing agent. We present thorough characterization of the structural,
textural and optical properties, performed on the obtained powders by the means of FESEM, TEM, XRD, SAED, BET and UV-VIS-NIR spectroscopy. Microscopical analysis revealed
the reduction of TiO2 particles size, upon the introduction of silver into the system, and
presence of sub-10 nm TiO2 particles decorated with sub-3 nm Ag dots in the composite
samples (0-15wt% of Ag). Structural analysis disclosed pure or predominant presence of
anatase crystallographic phase. Higher surface area compared to commercial referent
samples was obtained. Also, the enhancement of visible light absorption was detected in the
composite samples, compared to pure TiO2. The photocatalytic degradation of textile azo
dye (Reactive Orange 16) and antibiotic (Nutrofurantoin) was investigated, showing very
high adsorption capability of the powders, and superior photocatalytic behaviour compared
to referent samples.",
publisher = "CROATIAN ACADEMY OF SCIENCIES AND ARTS CROATIAN CRYSTALLOGRAPHIC ASSOCIATION ZAGREB, CROATIA",
journal = "The Book of Abstracts / The 26th Croatian-Slovenian Crystallographic Meeting, Poreč, Croatia, June 13-17,2018.",
title = "Ag/TiO2 nanoparticle composites and their photocatalytic performance",
pages = "57",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2955"
}

Tasić, N., Ćirković, J., Dapčević, A., Curkovic, L., Ribić, V., Žunić, M., Branković, G.,& Branković, Z.. (2018). Ag/TiO2 nanoparticle composites and their photocatalytic performance. in The Book of Abstracts / The 26th Croatian-Slovenian Crystallographic Meeting, Poreč, Croatia, June 13-17,2018.
CROATIAN ACADEMY OF SCIENCIES AND ARTS CROATIAN CRYSTALLOGRAPHIC ASSOCIATION ZAGREB, CROATIA., 57.
https://hdl.handle.net/21.15107/rcub_rimsi_2955

Tasić N, Ćirković J, Dapčević A, Curkovic L, Ribić V, Žunić M, Branković G, Branković Z. Ag/TiO2 nanoparticle composites and their photocatalytic performance. in The Book of Abstracts / The 26th Croatian-Slovenian Crystallographic Meeting, Poreč, Croatia, June 13-17,2018.. 2018;:57.
https://hdl.handle.net/21.15107/rcub_rimsi_2955 .

Tasić, Nikola, Ćirković, Jovana, Dapčević, Aleksandra, Curkovic, Lidija, Ribić, Vesna, Žunić, Milan, Branković, Goran, Branković, Zorica, "Ag/TiO2 nanoparticle composites and their photocatalytic performance" in The Book of Abstracts / The 26th Croatian-Slovenian Crystallographic Meeting, Poreč, Croatia, June 13-17,2018. (2018):57,
https://hdl.handle.net/21.15107/rcub_rimsi_2955 .

TY  - GEN
AU  - Radojković, Aleksandar
AU  - Žunić, Milan
AU  - Savic, Slavica
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1753
AB  - Predmet ovog integralnog istraživanja je ispitivanje uticaja različitih količina Zr4+, Nb5+ i Ta5+ na hemijsku stabilnost, mikrostrukturna i električna svojstva BaCe0.9Y0.1O3–δ kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju. Pored toga, izvršeno je poređenje tih materijala sa BaCe1–xInxO3–δ (x= 0.15; 0.20 i 0.25), a korišćene su i dve različite metode sinteze keramičkih prahova: metoda reakcije u čvrstom stanju i metoda samosagorevanja. Neporozni elektroliti su dobijeni sinterovanjem uniaksijalno presovanih keramičkih prahova BaCe0.9Y0.1O3–δ i 
BaCe0.9–xY0.1MxO3–δ (x= {0.01; 0.03; 0.05}, M= {Zr4+; Nb5+; Ta5+}) na 1550 °C u toku 5 h. S druge strane, BaCe1–xInxO3–δ su sinterovani na znatno nižoj temperaturi (1300 °C), na kojoj je izdvajanje BaO oksida praktično nemoguće, i to predstavlja glavnu prednost In kao dopanta. Električna karakterizacija sinterovanih uzoraka je izvršena elektrohemijskom impedansnom analizom. Ukupna provodljivost, merena u temperaturnom intervalu od 550–750 °C u atmosferi vlažnog vodonika, opadala je sa snižavanjem temperature i sa porastom koncentracije dopanata za BaCe0.9–xY0.1MxO3–δ (M= {Zr4+; Nb5+; Ta5+}), dok je kod BaCe1–xInxO3–δ primećen suprotan trend, ali su provodljivosti u slučaju dopiranja indijumom bile znatno manje. Hemijska stabilnost elektrolita je ispitana izlaganjem uzoraka atmosferi CO2 na 700 °C u toku 5 h. Svi elektroliti BaCe1–xInxO3–δ su bili postojani na uticaj CO2, kod BaCe0.85Y0.1Nb0.05O3–δ i 
BaCe0.85Y0.1Ta0.05O3–δ je primećena značajna stabilnost, dok je nestabinost ostalih uzoraka bila izraženija što je sadržaj Nb, Ta ili Zr bio manji. Elektrolit sastava BaCe0.75In0.25O3–δ (BCI25) je pokazao optimalna svojstva, pa je odabran za testiranje rada gorivne ćelije. Zahvaljujući velikoj specifičnoj površini praha BCI25, dobijenog metodom samosagorevanja, bilo je moguće njegovo procesiranje elektroforetskom depozicijom u kompaktan elektrolitni sloj od 10 μm. Izlazna snaga ćelije na 700 °C, sastava vodonik/Ni-BCI25//BCI25//La0.8Sr0.2Co0.2Fe0.8O3-BCI25/vazduh, iznosila je ~250 mW/cm2, čime je potvrđena funkcionalnost ovog elektrolita.
PB  - Društvo za keramičke materijale Srbije
T2  - Društvo za keramičke materijale Srbije
T1  - Hemijska stabilnost dopianog barijum-cerijum-oksida kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1753
ER  - 

@misc{
author = "Radojković, Aleksandar and Žunić, Milan and Savic, Slavica and Branković, Zorica and Branković, Goran",
year = "2018",
abstract = "Predmet ovog integralnog istraživanja je ispitivanje uticaja različitih količina Zr4+, Nb5+ i Ta5+ na hemijsku stabilnost, mikrostrukturna i električna svojstva BaCe0.9Y0.1O3–δ kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju. Pored toga, izvršeno je poređenje tih materijala sa BaCe1–xInxO3–δ (x= 0.15; 0.20 i 0.25), a korišćene su i dve različite metode sinteze keramičkih prahova: metoda reakcije u čvrstom stanju i metoda samosagorevanja. Neporozni elektroliti su dobijeni sinterovanjem uniaksijalno presovanih keramičkih prahova BaCe0.9Y0.1O3–δ i 
BaCe0.9–xY0.1MxO3–δ (x= {0.01; 0.03; 0.05}, M= {Zr4+; Nb5+; Ta5+}) na 1550 °C u toku 5 h. S druge strane, BaCe1–xInxO3–δ su sinterovani na znatno nižoj temperaturi (1300 °C), na kojoj je izdvajanje BaO oksida praktično nemoguće, i to predstavlja glavnu prednost In kao dopanta. Električna karakterizacija sinterovanih uzoraka je izvršena elektrohemijskom impedansnom analizom. Ukupna provodljivost, merena u temperaturnom intervalu od 550–750 °C u atmosferi vlažnog vodonika, opadala je sa snižavanjem temperature i sa porastom koncentracije dopanata za BaCe0.9–xY0.1MxO3–δ (M= {Zr4+; Nb5+; Ta5+}), dok je kod BaCe1–xInxO3–δ primećen suprotan trend, ali su provodljivosti u slučaju dopiranja indijumom bile znatno manje. Hemijska stabilnost elektrolita je ispitana izlaganjem uzoraka atmosferi CO2 na 700 °C u toku 5 h. Svi elektroliti BaCe1–xInxO3–δ su bili postojani na uticaj CO2, kod BaCe0.85Y0.1Nb0.05O3–δ i 
BaCe0.85Y0.1Ta0.05O3–δ je primećena značajna stabilnost, dok je nestabinost ostalih uzoraka bila izraženija što je sadržaj Nb, Ta ili Zr bio manji. Elektrolit sastava BaCe0.75In0.25O3–δ (BCI25) je pokazao optimalna svojstva, pa je odabran za testiranje rada gorivne ćelije. Zahvaljujući velikoj specifičnoj površini praha BCI25, dobijenog metodom samosagorevanja, bilo je moguće njegovo procesiranje elektroforetskom depozicijom u kompaktan elektrolitni sloj od 10 μm. Izlazna snaga ćelije na 700 °C, sastava vodonik/Ni-BCI25//BCI25//La0.8Sr0.2Co0.2Fe0.8O3-BCI25/vazduh, iznosila je ~250 mW/cm2, čime je potvrđena funkcionalnost ovog elektrolita.",
publisher = "Društvo za keramičke materijale Srbije",
journal = "Društvo za keramičke materijale Srbije",
title = "Hemijska stabilnost dopianog barijum-cerijum-oksida kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1753"
}

Radojković, A., Žunić, M., Savic, S., Branković, Z.,& Branković, G.. (2018). Hemijska stabilnost dopianog barijum-cerijum-oksida kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju. in Društvo za keramičke materijale Srbije
Društvo za keramičke materijale Srbije..
https://hdl.handle.net/21.15107/rcub_rimsi_1753

Radojković A, Žunić M, Savic S, Branković Z, Branković G. Hemijska stabilnost dopianog barijum-cerijum-oksida kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju. in Društvo za keramičke materijale Srbije. 2018;.
https://hdl.handle.net/21.15107/rcub_rimsi_1753 .

Radojković, Aleksandar, Žunić, Milan, Savic, Slavica, Branković, Zorica, Branković, Goran, "Hemijska stabilnost dopianog barijum-cerijum-oksida kao elektrolita za gorivne ćelije na bazi oksida u čvrstom stanju" in Društvo za keramičke materijale Srbije (2018),
https://hdl.handle.net/21.15107/rcub_rimsi_1753 .