TY  - CONF
AU  - Vojisavljević, Katarina
AU  - Vukašinović, Jelena
AU  - Počuča-Nešić, Milica
AU  - Savic, Slavica
AU  - Podlogar, Matejka
AU  - Zemljak, Olivera
AU  - Branković, Zorica
PY  - 2022
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2038
AB  - Hierarchical nanostructures with multiporous tin oxide nanofibers (SnO2-
MPNFs) and zinc oxide nanorods (ZnO-NRs) have been synthesized by combining
electrospinning technique and hydrothermal method. A solution containing
uniformly distributed tin (Sn) and silicon (Si) species of precursors, as well as a
sacrificial polymer (PVP) was electrospun using a single-nozzle spinneret to
fabricate nanofibers. In virtue of the Kirkendall effect driven by calcination at
550 °C, the SiO2-cored SnO2 nanofibers (SnO2-SiO2-NFs) deliberated from PVP
were formed and used as backbones for further hydrothermal growth of ZnO-NRs.
By varying the hydrothermal reaction time (0.5–2 h) at the constant concentration of
SnO2-SiO2-NFs, zinc (Zn) precursor, directing agent (hexamethylenetetramine,
HMT) and aqueous ammonia, the density, length and thickness of ZnO-NRs were
controlled. Nanofibers and ZnO-NRs/SnO2-MPNFs heterostructures are confirmed
by X-ray diffraction (XRD), field-emission scanning electron microcopy (FE-SEM),
energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and
elemental mapping analysis. 
The hydrothermal treatment conducted at 90 °C in aqueous ammonia allowed:
a) selective etching of SiO2 from the SnO2-SiO2-NFs core and SiO2 trapped between
SnO2 particles, and b) effective growth of ZnO-NRs. The process resulted in
ZnO-NRs/SnO2-MPNFs heterostructures with ZnO-NRs of 1–5 μm in length
attached to SnO2-MPNFs, the shell of which was composed of ultra-fine SnO2
crystallites (~5 nm in size) and where the four porous channels create the core
instead of SiO2. Photocatalytic performance of the heterostructures was investigated
toward different organic azo-dyes (methylene blue, methyl orange) and obvious
enhancement was demonstrated in degradation of the organic pollutant, compared to
primary SnO2-based nanofibers.
PB  - University of Belgrade, Institute for Multidisciplinary Research
C3  - 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
T1  - Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2038
ER  - 

@conference{
author = "Vojisavljević, Katarina and Vukašinović, Jelena and Počuča-Nešić, Milica and Savic, Slavica and Podlogar, Matejka and Zemljak, Olivera and Branković, Zorica",
year = "2022",
abstract = "Hierarchical nanostructures with multiporous tin oxide nanofibers (SnO2-
MPNFs) and zinc oxide nanorods (ZnO-NRs) have been synthesized by combining
electrospinning technique and hydrothermal method. A solution containing
uniformly distributed tin (Sn) and silicon (Si) species of precursors, as well as a
sacrificial polymer (PVP) was electrospun using a single-nozzle spinneret to
fabricate nanofibers. In virtue of the Kirkendall effect driven by calcination at
550 °C, the SiO2-cored SnO2 nanofibers (SnO2-SiO2-NFs) deliberated from PVP
were formed and used as backbones for further hydrothermal growth of ZnO-NRs.
By varying the hydrothermal reaction time (0.5–2 h) at the constant concentration of
SnO2-SiO2-NFs, zinc (Zn) precursor, directing agent (hexamethylenetetramine,
HMT) and aqueous ammonia, the density, length and thickness of ZnO-NRs were
controlled. Nanofibers and ZnO-NRs/SnO2-MPNFs heterostructures are confirmed
by X-ray diffraction (XRD), field-emission scanning electron microcopy (FE-SEM),
energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and
elemental mapping analysis. 
The hydrothermal treatment conducted at 90 °C in aqueous ammonia allowed:
a) selective etching of SiO2 from the SnO2-SiO2-NFs core and SiO2 trapped between
SnO2 particles, and b) effective growth of ZnO-NRs. The process resulted in
ZnO-NRs/SnO2-MPNFs heterostructures with ZnO-NRs of 1–5 μm in length
attached to SnO2-MPNFs, the shell of which was composed of ultra-fine SnO2
crystallites (~5 nm in size) and where the four porous channels create the core
instead of SiO2. Photocatalytic performance of the heterostructures was investigated
toward different organic azo-dyes (methylene blue, methyl orange) and obvious
enhancement was demonstrated in degradation of the organic pollutant, compared to
primary SnO2-based nanofibers.",
publisher = "University of Belgrade, Institute for Multidisciplinary Research",
journal = "6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia",
title = "Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances",
pages = "51",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2038"
}

Vojisavljević, K., Vukašinović, J., Počuča-Nešić, M., Savic, S., Podlogar, M., Zemljak, O.,& Branković, Z.. (2022). Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia
University of Belgrade, Institute for Multidisciplinary Research., 51.
https://hdl.handle.net/21.15107/rcub_rimsi_2038

Vojisavljević K, Vukašinović J, Počuča-Nešić M, Savic S, Podlogar M, Zemljak O, Branković Z. Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances. in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia. 2022;:51.
https://hdl.handle.net/21.15107/rcub_rimsi_2038 .

Vojisavljević, Katarina, Vukašinović, Jelena, Počuča-Nešić, Milica, Savic, Slavica, Podlogar, Matejka, Zemljak, Olivera, Branković, Zorica, "Hierarchical ZnO/SnO2 heterostructures via hydrothermally assisted electrospinning technique: synthesis and photocatalytic performances" in 6th Conference of the Serbian Society for Ceramic Materials, 6CSCS-2022, June 28-29, 2022, Belgrade, Serbia (2022):51,
https://hdl.handle.net/21.15107/rcub_rimsi_2038 .

TY  - CONF
AU  - Ribić, Vesna
AU  - Rečnik, Aleksander
AU  - Kokalj, Anton
AU  - Dražić, Goran
AU  - Podlogar, Matejka
AU  - Daneu, Nina
AU  - Komelj, Matej
AU  - Luković Golić, Danijela
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2018
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2434
AB  - Zinc oxide is an important semiconducting material that finds wide ranging applications. There has been considerable interest in ZnO as a low cost, non-toxic and highly stable thermoelectric. In order to enhance its properties for these purposes it is frequently doped with other compounds, usually oxides. Special impact on the improvement of TE properties in doped ZnO have planar defects. So far it  is well known that certain dopants trigger formation of inversion boundary (IB) in wurtzite structure of ZnO. These planar defects are interesting because they affect material properties and morphology of grains. In our study we investigated structure and chemistry of basal plane inversion boundaries in polycrystalline ZnO using conventional transmission electron microscopy and high-resolution electron microscopy. Based on HRTEM images we reconstructed models of IBs that are formed in addition of In, Sn and Sb as dopants. IBs can also be found in pyramidal planes and can be classified as head-to-head (→│←) or tail-to-tail (←│→) configuration depending on the orientation of the polar c-axis. By defining the zinc planes as A, B, or C and the oxygen planes as α, β or γ the perfect ZnO crystal structure has the AαBβAαBβ stacking sequence. Translation obtained from images is compared with three different, so far known, types of the head-to-head IB translations with octahedral coordination of cations at IB-plane: (i) IB with βγβγ׀α׀βαβα stacking of the cation sublattice, as observed with Sb doping1, (ii) IB with αγαγ׀α׀βαβα, as observed with In, Fe and Sn2 doping and (iii) IB with βαβα׀γ׀βαβα as observed with Mn3 doping (Figure 1). The generated models were examined in terms of stability by DFT calculations implemented in the Quantum-Espresso package.
PB  - Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade Hydrogen Economy Initiative Serbia, Belgrade, Belgrade, Serbia
C3  - PROGRAMME AND THE BOOK OF ABSTRACTS / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018
T1  - Structural characterization of Inversion Boundaries in Doped ZnO
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2434
ER  - 

@conference{
author = "Ribić, Vesna and Rečnik, Aleksander and Kokalj, Anton and Dražić, Goran and Podlogar, Matejka and Daneu, Nina and Komelj, Matej and Luković Golić, Danijela and Branković, Zorica and Branković, Goran",
year = "2018",
abstract = "Zinc oxide is an important semiconducting material that finds wide ranging applications. There has been considerable interest in ZnO as a low cost, non-toxic and highly stable thermoelectric. In order to enhance its properties for these purposes it is frequently doped with other compounds, usually oxides. Special impact on the improvement of TE properties in doped ZnO have planar defects. So far it  is well known that certain dopants trigger formation of inversion boundary (IB) in wurtzite structure of ZnO. These planar defects are interesting because they affect material properties and morphology of grains. In our study we investigated structure and chemistry of basal plane inversion boundaries in polycrystalline ZnO using conventional transmission electron microscopy and high-resolution electron microscopy. Based on HRTEM images we reconstructed models of IBs that are formed in addition of In, Sn and Sb as dopants. IBs can also be found in pyramidal planes and can be classified as head-to-head (→│←) or tail-to-tail (←│→) configuration depending on the orientation of the polar c-axis. By defining the zinc planes as A, B, or C and the oxygen planes as α, β or γ the perfect ZnO crystal structure has the AαBβAαBβ stacking sequence. Translation obtained from images is compared with three different, so far known, types of the head-to-head IB translations with octahedral coordination of cations at IB-plane: (i) IB with βγβγ׀α׀βαβα stacking of the cation sublattice, as observed with Sb doping1, (ii) IB with αγαγ׀α׀βαβα, as observed with In, Fe and Sn2 doping and (iii) IB with βαβα׀γ׀βαβα as observed with Mn3 doping (Figure 1). The generated models were examined in terms of stability by DFT calculations implemented in the Quantum-Espresso package.",
publisher = "Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade Hydrogen Economy Initiative Serbia, Belgrade, Belgrade, Serbia",
journal = "PROGRAMME AND THE BOOK OF ABSTRACTS / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018",
title = "Structural characterization of Inversion Boundaries in Doped ZnO",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2434"
}

Ribić, V., Rečnik, A., Kokalj, A., Dražić, G., Podlogar, M., Daneu, N., Komelj, M., Luković Golić, D., Branković, Z.,& Branković, G.. (2018). Structural characterization of Inversion Boundaries in Doped ZnO. in PROGRAMME AND THE BOOK OF ABSTRACTS / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018
Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade Hydrogen Economy Initiative Serbia, Belgrade, Belgrade, Serbia..
https://hdl.handle.net/21.15107/rcub_rimsi_2434

Ribić V, Rečnik A, Kokalj A, Dražić G, Podlogar M, Daneu N, Komelj M, Luković Golić D, Branković Z, Branković G. Structural characterization of Inversion Boundaries in Doped ZnO. in PROGRAMME AND THE BOOK OF ABSTRACTS / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018. 2018;.
https://hdl.handle.net/21.15107/rcub_rimsi_2434 .

Ribić, Vesna, Rečnik, Aleksander, Kokalj, Anton, Dražić, Goran, Podlogar, Matejka, Daneu, Nina, Komelj, Matej, Luković Golić, Danijela, Branković, Zorica, Branković, Goran, "Structural characterization of Inversion Boundaries in Doped ZnO" in PROGRAMME AND THE BOOK OF ABSTRACTS / 3rd International Symposium on Materials for Energy Storage and Conversion - mESC-IS 2018 (2018),
https://hdl.handle.net/21.15107/rcub_rimsi_2434 .