TY  - CONF
AU  - Vijatović Petrović, Mirjana
AU  - Craciun, Floriana
AU  - Cordero, Francesco
AU  - MERCADELLI, ELISA
AU  - Ilić, Nikola
AU  - Despotovic, Zeljko V.
AU  - Bobić, Jelena
AU  - Džunuzović, Adis
AU  - Galassi, Carmen
AU  - Stagnaro, Paola
AU  - Canu, Giovanna
AU  - Buscaglia, Maria Teresa
AU  - Brunengo, Elisabetta
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2430
AB  - 0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3/polyvinylidene fluoride flexible composite films were prepared by the hot-pressing method. Surface modification of active phase particles was performed using two coupling agents, namely, (3- aminopropyl)triethoxysilane (APTES) and dodecyl triethoxysilane (DDTES) to enable good adhesion of active phase particles with the polymer matrix. The highest amount of electroactive PVDF β- phase was formed in APTES-modified samples while in DDTES samples mainly γ- phase was formed. Dielectric permittivity values and dielectric losses decreased for silanized samples due to reduced tension at the interface between particles and polymer. Strong intermolecular interaction between the PVDF chains and the APTES-modified particles led to enhanced breakdown strength of these samples. After the polarization of films, energy harvesting potential was evaluated for all samples. The highest voltage output of ~ 15 V and power ~ 225 μW were obtained for a single APTES-modified harvester [1-2].
PB  - The Serbian Society for Ceramic Materials
C3  - 7th Conference of The Serbian Society for Ceramic Materials
T1  - ENHANCED PROPERTIES OF PVDF COMPOSITES BY ACTIVE PHASE SILANIZATION
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2430
ER  - 

@conference{
author = "Vijatović Petrović, Mirjana and Craciun, Floriana and Cordero, Francesco and MERCADELLI, ELISA and Ilić, Nikola and Despotovic, Zeljko V. and Bobić, Jelena and Džunuzović, Adis and Galassi, Carmen and Stagnaro, Paola and Canu, Giovanna and Buscaglia, Maria Teresa and Brunengo, Elisabetta",
year = "2023",
abstract = "0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3/polyvinylidene fluoride flexible composite films were prepared by the hot-pressing method. Surface modification of active phase particles was performed using two coupling agents, namely, (3- aminopropyl)triethoxysilane (APTES) and dodecyl triethoxysilane (DDTES) to enable good adhesion of active phase particles with the polymer matrix. The highest amount of electroactive PVDF β- phase was formed in APTES-modified samples while in DDTES samples mainly γ- phase was formed. Dielectric permittivity values and dielectric losses decreased for silanized samples due to reduced tension at the interface between particles and polymer. Strong intermolecular interaction between the PVDF chains and the APTES-modified particles led to enhanced breakdown strength of these samples. After the polarization of films, energy harvesting potential was evaluated for all samples. The highest voltage output of ~ 15 V and power ~ 225 μW were obtained for a single APTES-modified harvester [1-2].",
publisher = "The Serbian Society for Ceramic Materials",
journal = "7th Conference of The Serbian Society for Ceramic Materials",
title = "ENHANCED PROPERTIES OF PVDF COMPOSITES BY ACTIVE PHASE SILANIZATION",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2430"
}

Vijatović Petrović, M., Craciun, F., Cordero, F., MERCADELLI, E., Ilić, N., Despotovic, Z. V., Bobić, J., Džunuzović, A., Galassi, C., Stagnaro, P., Canu, G., Buscaglia, M. T.,& Brunengo, E.. (2023). ENHANCED PROPERTIES OF PVDF COMPOSITES BY ACTIVE PHASE SILANIZATION. in 7th Conference of The Serbian Society for Ceramic Materials
The Serbian Society for Ceramic Materials..
https://hdl.handle.net/21.15107/rcub_rimsi_2430

Vijatović Petrović M, Craciun F, Cordero F, MERCADELLI E, Ilić N, Despotovic ZV, Bobić J, Džunuzović A, Galassi C, Stagnaro P, Canu G, Buscaglia MT, Brunengo E. ENHANCED PROPERTIES OF PVDF COMPOSITES BY ACTIVE PHASE SILANIZATION. in 7th Conference of The Serbian Society for Ceramic Materials. 2023;.
https://hdl.handle.net/21.15107/rcub_rimsi_2430 .

Vijatović Petrović, Mirjana, Craciun, Floriana, Cordero, Francesco, MERCADELLI, ELISA, Ilić, Nikola, Despotovic, Zeljko V., Bobić, Jelena, Džunuzović, Adis, Galassi, Carmen, Stagnaro, Paola, Canu, Giovanna, Buscaglia, Maria Teresa, Brunengo, Elisabetta, "ENHANCED PROPERTIES OF PVDF COMPOSITES BY ACTIVE PHASE SILANIZATION" in 7th Conference of The Serbian Society for Ceramic Materials (2023),
https://hdl.handle.net/21.15107/rcub_rimsi_2430 .

TY  - CONF
AU  - Vijatović Petrović, Mirjana
AU  - Cordero, Francesco
AU  - MERCADELLI, ELISA
AU  - Brunengo, Elisabetta
AU  - Ilić, Nikola
AU  - Galassi, Carmen
AU  - Despotovic, Zeljko V.
AU  - Bobić, Jelena
AU  - Džunuzović, Adis
AU  - Stagnaro, Paola
AU  - Canu, Giovanna
AU  - Craciun, Floriana
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2423
AB  - Energy  is  available  all  around  us  in  different  forms  and  shapes  such  as  from  sun,  wind,  waves,  vibrations  etc. The  enormous  amount  of  mechanical  energy  released  in  everyday  life  by  human  walking,  transportation   movement,   sound   waves   and   other,    represent   renewable   and   safe   energy   source.   Piezoelectric  generators  exhibit  a  great  potential  for  powering  up  low-power  portable  devices  and  self-powered  electronic  systems  by  extraction  of  mechanical  energy.  Employment  of  lead-free  piezoelectric  materials will  be  a  breakthrough  of  a  completely  new  type  of  safe  and  harmless  production  of  energy  for  daily life. Recent challenge in electronics is also utilization of flexible electronics with the ability to bend into diverse shapes which expands the applications of modern electronic devices in different areas.Polymer PVDF/piezoelectric ceramics,  flexible  composite  films  were  prepared  by  hot  pressing  method. The  influence  of  hot  pressing  method  on  the  formation  of  electroactive  PVDF  phases  in  the  polymer was proven by FTIR analysis.  DSC analysis have shown the change of PVDF crystallinity degree in  the  flexible  films  with  addition  of  ceramics  filler  particles.  The  dielectric  permittivity value  increased  with the addition of filler in the polymer matrix while the relaxation processes were governed mostly by the PVDF matrix. Polarization of flexible films enhanced the formation of PVDF electroactive β- phase in the samples. Energy  harvesting  potential  was  studied  by measuring  of voltage  output  under  the  impulse  hammer load.
PB  - 7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain
C3  - 7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain
T1  - Energy Harvesting Potential of Polymer Composites
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2423
ER  - 

@conference{
author = "Vijatović Petrović, Mirjana and Cordero, Francesco and MERCADELLI, ELISA and Brunengo, Elisabetta and Ilić, Nikola and Galassi, Carmen and Despotovic, Zeljko V. and Bobić, Jelena and Džunuzović, Adis and Stagnaro, Paola and Canu, Giovanna and Craciun, Floriana",
year = "2023",
abstract = "Energy  is  available  all  around  us  in  different  forms  and  shapes  such  as  from  sun,  wind,  waves,  vibrations  etc. The  enormous  amount  of  mechanical  energy  released  in  everyday  life  by  human  walking,  transportation   movement,   sound   waves   and   other,    represent   renewable   and   safe   energy   source.   Piezoelectric  generators  exhibit  a  great  potential  for  powering  up  low-power  portable  devices  and  self-powered  electronic  systems  by  extraction  of  mechanical  energy.  Employment  of  lead-free  piezoelectric  materials will  be  a  breakthrough  of  a  completely  new  type  of  safe  and  harmless  production  of  energy  for  daily life. Recent challenge in electronics is also utilization of flexible electronics with the ability to bend into diverse shapes which expands the applications of modern electronic devices in different areas.Polymer PVDF/piezoelectric ceramics,  flexible  composite  films  were  prepared  by  hot  pressing  method. The  influence  of  hot  pressing  method  on  the  formation  of  electroactive  PVDF  phases  in  the  polymer was proven by FTIR analysis.  DSC analysis have shown the change of PVDF crystallinity degree in  the  flexible  films  with  addition  of  ceramics  filler  particles.  The  dielectric  permittivity value  increased  with the addition of filler in the polymer matrix while the relaxation processes were governed mostly by the PVDF matrix. Polarization of flexible films enhanced the formation of PVDF electroactive β- phase in the samples. Energy  harvesting  potential  was  studied  by measuring  of voltage  output  under  the  impulse  hammer load.",
publisher = "7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain",
journal = "7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain",
title = "Energy Harvesting Potential of Polymer Composites",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2423"
}

Vijatović Petrović, M., Cordero, F., MERCADELLI, E., Brunengo, E., Ilić, N., Galassi, C., Despotovic, Z. V., Bobić, J., Džunuzović, A., Stagnaro, P., Canu, G.,& Craciun, F.. (2023). Energy Harvesting Potential of Polymer Composites. in 7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain
7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain..
https://hdl.handle.net/21.15107/rcub_rimsi_2423

Vijatović Petrović M, Cordero F, MERCADELLI E, Brunengo E, Ilić N, Galassi C, Despotovic ZV, Bobić J, Džunuzović A, Stagnaro P, Canu G, Craciun F. Energy Harvesting Potential of Polymer Composites. in 7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain. 2023;.
https://hdl.handle.net/21.15107/rcub_rimsi_2423 .

Vijatović Petrović, Mirjana, Cordero, Francesco, MERCADELLI, ELISA, Brunengo, Elisabetta, Ilić, Nikola, Galassi, Carmen, Despotovic, Zeljko V., Bobić, Jelena, Džunuzović, Adis, Stagnaro, Paola, Canu, Giovanna, Craciun, Floriana, "Energy Harvesting Potential of Polymer Composites" in 7th World Congress on Materials science and Engineering, 5th World Congress on Lasers, Optics and Photonics, joint event, Valencia, Spain (2023),
https://hdl.handle.net/21.15107/rcub_rimsi_2423 .

TY  - JOUR
AU  - Craciun, Floriana
AU  - Cordero, Francesco
AU  - MERCADELLI, ELISA
AU  - Ilić, Nikola
AU  - Galassi, Carmen
AU  - Baldisserri, Carlo
AU  - Bobić, Jelena
AU  - Stagnaro, Paola
AU  - Canu, Giovanna
AU  - Buscaglia, Maria Teresa
AU  - Džunuzović, Adis
AU  - Vijatović Petrović, Mirjana
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2125
AB  - In the last years, ultrasound energy harvesting has emerged as the most promising technique for wireless power supply of implanted medical devices. These devices require flexible piezoelectric materials with high piezoelectric response in the ultrasonic range. Here we report on bio-compatible NBT-BT/PVDF flexible composites, with variable filler content up to 50 vol%, prepared by a properly designed and optimized process, which incorporates in a complex connectivity pattern fully sintered NBT-BT crystalline powders in a PVDF matrix. The dielectric constant of the flexible composites increased from 10 of pure PVDF polymer to 110 of composite films with 50 vol% NBT-BT content, while the high frequency piezoelectric d33 constant increased from 0.2 pC/N to 33 pC/N for the same samples. The composite with 50 vol% NBT-BT exhibits the figure of merit for the harvested ultrasound energy d33g33 ≅ 1.54 × 10−12 m3/J, which is comparable to the figure of merit for the NBT-BT piezoelectric ceramic (1.8 × 10−12 m3/J) and higher than other reported results for random composites. Based on these results, this study provides an easy method to fabricate random flexible piezoelectric composites with enhanced high frequency piezoelectric response and high energy density harvested from an ultrasound source.
PB  - Elsevier Ltd
T2  - Composites Part B: Engineering
T1  - Flexible composite films with enhanced piezoelectric properties for energy harvesting and wireless ultrasound-powered technology
SP  - 110835
VL  - 263
DO  - 10.1016/j.compositesb.2023.110835
ER  - 

@article{
author = "Craciun, Floriana and Cordero, Francesco and MERCADELLI, ELISA and Ilić, Nikola and Galassi, Carmen and Baldisserri, Carlo and Bobić, Jelena and Stagnaro, Paola and Canu, Giovanna and Buscaglia, Maria Teresa and Džunuzović, Adis and Vijatović Petrović, Mirjana",
year = "2023",
abstract = "In the last years, ultrasound energy harvesting has emerged as the most promising technique for wireless power supply of implanted medical devices. These devices require flexible piezoelectric materials with high piezoelectric response in the ultrasonic range. Here we report on bio-compatible NBT-BT/PVDF flexible composites, with variable filler content up to 50 vol%, prepared by a properly designed and optimized process, which incorporates in a complex connectivity pattern fully sintered NBT-BT crystalline powders in a PVDF matrix. The dielectric constant of the flexible composites increased from 10 of pure PVDF polymer to 110 of composite films with 50 vol% NBT-BT content, while the high frequency piezoelectric d33 constant increased from 0.2 pC/N to 33 pC/N for the same samples. The composite with 50 vol% NBT-BT exhibits the figure of merit for the harvested ultrasound energy d33g33 ≅ 1.54 × 10−12 m3/J, which is comparable to the figure of merit for the NBT-BT piezoelectric ceramic (1.8 × 10−12 m3/J) and higher than other reported results for random composites. Based on these results, this study provides an easy method to fabricate random flexible piezoelectric composites with enhanced high frequency piezoelectric response and high energy density harvested from an ultrasound source.",
publisher = "Elsevier Ltd",
journal = "Composites Part B: Engineering",
title = "Flexible composite films with enhanced piezoelectric properties for energy harvesting and wireless ultrasound-powered technology",
pages = "110835",
volume = "263",
doi = "10.1016/j.compositesb.2023.110835"
}

Craciun, F., Cordero, F., MERCADELLI, E., Ilić, N., Galassi, C., Baldisserri, C., Bobić, J., Stagnaro, P., Canu, G., Buscaglia, M. T., Džunuzović, A.,& Vijatović Petrović, M.. (2023). Flexible composite films with enhanced piezoelectric properties for energy harvesting and wireless ultrasound-powered technology. in Composites Part B: Engineering
Elsevier Ltd., 263, 110835.
https://doi.org/10.1016/j.compositesb.2023.110835

Craciun F, Cordero F, MERCADELLI E, Ilić N, Galassi C, Baldisserri C, Bobić J, Stagnaro P, Canu G, Buscaglia MT, Džunuzović A, Vijatović Petrović M. Flexible composite films with enhanced piezoelectric properties for energy harvesting and wireless ultrasound-powered technology. in Composites Part B: Engineering. 2023;263:110835.
doi:10.1016/j.compositesb.2023.110835 .

Craciun, Floriana, Cordero, Francesco, MERCADELLI, ELISA, Ilić, Nikola, Galassi, Carmen, Baldisserri, Carlo, Bobić, Jelena, Stagnaro, Paola, Canu, Giovanna, Buscaglia, Maria Teresa, Džunuzović, Adis, Vijatović Petrović, Mirjana, "Flexible composite films with enhanced piezoelectric properties for energy harvesting and wireless ultrasound-powered technology" in Composites Part B: Engineering, 263 (2023):110835,
https://doi.org/10.1016/j.compositesb.2023.110835 . .

TY  - CONF
AU  - Buscaglia, Maria Teresa
AU  - Stagnaro, Paola
AU  - Curecheriu, Lavinia-Petronela
AU  - Canu, Giovanna
AU  - MERCADELLI, ELISA
AU  - Vijatović Petrović, Mirjana
AU  - Craciun, Floriana
AU  - Barzic, Andreea-Irina
AU  - Mitoseriu, Liliana
AU  - BUSCAGLIA, VINCENZO
PY  - 2023
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2437
AB  - Polymer-based  composites  containing  insulating  inorganic  fillers  with  different functionalities are attracting a great deal of interest for multiple applications, including embedded planar capacitors, flexible piezoelectric harvesters and portable devices for self-powered electronics. They  combine  typical  properties  of  polymers,  such  as  easy  processing  at  low temperature,  flexibility  and  high  breakdown  strength  (BDS)  with  the  dielectric  or piezoelectric properties of some inorganic compounds and, in particular, of ferroelectric perovskites such as BaTiO3, 0.94 Na0.5Bi0.5TiO3 - 0.06 BaTiO3 and Ba1-yCayZrxTi1-xO3. A rational selection of components, good interface engineering and proper processing optimization  allows  a  thorough  comprehension  of  the  complex  process-structure-morphology-properties relationships of the multicomponent systems. Here, we present our most significant results on PVDF-ceramic composites for energy harvesting and storage. A careful multi-level characterization allows the optimization of the functional properties (dielectric  behaviour,  piezoelectricity,  power  density),  performance  and  durability (mechanical  strength,  flexibility,  fatigue  resistance)  as  specifically  required  for  the envisaged final devices.
PB  - Ecers XVIII 2023, 2-6.7.2023. Lyon, France
C3  - Ecers XVIII 2023, 2-6.7.2023. Lyon, France
T1  - Smart functional polymer-ceramiccomposites for sustainable energy harvesting and storage
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2437
ER  - 

@conference{
author = "Buscaglia, Maria Teresa and Stagnaro, Paola and Curecheriu, Lavinia-Petronela and Canu, Giovanna and MERCADELLI, ELISA and Vijatović Petrović, Mirjana and Craciun, Floriana and Barzic, Andreea-Irina and Mitoseriu, Liliana and BUSCAGLIA, VINCENZO",
year = "2023",
abstract = "Polymer-based  composites  containing  insulating  inorganic  fillers  with  different functionalities are attracting a great deal of interest for multiple applications, including embedded planar capacitors, flexible piezoelectric harvesters and portable devices for self-powered electronics. They  combine  typical  properties  of  polymers,  such  as  easy  processing  at  low temperature,  flexibility  and  high  breakdown  strength  (BDS)  with  the  dielectric  or piezoelectric properties of some inorganic compounds and, in particular, of ferroelectric perovskites such as BaTiO3, 0.94 Na0.5Bi0.5TiO3 - 0.06 BaTiO3 and Ba1-yCayZrxTi1-xO3. A rational selection of components, good interface engineering and proper processing optimization  allows  a  thorough  comprehension  of  the  complex  process-structure-morphology-properties relationships of the multicomponent systems. Here, we present our most significant results on PVDF-ceramic composites for energy harvesting and storage. A careful multi-level characterization allows the optimization of the functional properties (dielectric  behaviour,  piezoelectricity,  power  density),  performance  and  durability (mechanical  strength,  flexibility,  fatigue  resistance)  as  specifically  required  for  the envisaged final devices.",
publisher = "Ecers XVIII 2023, 2-6.7.2023. Lyon, France",
journal = "Ecers XVIII 2023, 2-6.7.2023. Lyon, France",
title = "Smart functional polymer-ceramiccomposites for sustainable energy harvesting and storage",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2437"
}

Buscaglia, M. T., Stagnaro, P., Curecheriu, L., Canu, G., MERCADELLI, E., Vijatović Petrović, M., Craciun, F., Barzic, A., Mitoseriu, L.,& BUSCAGLIA, V.. (2023). Smart functional polymer-ceramiccomposites for sustainable energy harvesting and storage. in Ecers XVIII 2023, 2-6.7.2023. Lyon, France
Ecers XVIII 2023, 2-6.7.2023. Lyon, France..
https://hdl.handle.net/21.15107/rcub_rimsi_2437

Buscaglia MT, Stagnaro P, Curecheriu L, Canu G, MERCADELLI E, Vijatović Petrović M, Craciun F, Barzic A, Mitoseriu L, BUSCAGLIA V. Smart functional polymer-ceramiccomposites for sustainable energy harvesting and storage. in Ecers XVIII 2023, 2-6.7.2023. Lyon, France. 2023;.
https://hdl.handle.net/21.15107/rcub_rimsi_2437 .

Buscaglia, Maria Teresa, Stagnaro, Paola, Curecheriu, Lavinia-Petronela, Canu, Giovanna, MERCADELLI, ELISA, Vijatović Petrović, Mirjana, Craciun, Floriana, Barzic, Andreea-Irina, Mitoseriu, Liliana, BUSCAGLIA, VINCENZO, "Smart functional polymer-ceramiccomposites for sustainable energy harvesting and storage" in Ecers XVIII 2023, 2-6.7.2023. Lyon, France (2023),
https://hdl.handle.net/21.15107/rcub_rimsi_2437 .

TY  - CONF
AU  - Vijatović Petrović, Mirjana
AU  - Craciun, Floriana
AU  - Cordero, Francesco
AU  - MERCADELLI, ELISA
AU  - Galassi, Carmen
AU  - Ilić, Nikola
AU  - Brunengo, Elisabetta
AU  - Despotovic, Zeljko V.
AU  - Bobić, Jelena
AU  - Džunuzović, Adis
AU  - Stagnaro, Paola
PY  - 2021
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/2472
AB  - The important task of scientific community nowadays is finding the way to use enormous
amount of mechanical energy released everywhere around us as a renewable and safe energy
source.
This research was focused on the preparation of flexible composite films, by combining a
highly flexible polyvinylidene fluoride (PVDF) polymer matrix with lead-free piezoelectric
perovskites, 0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3 (NBT-BT), in different ratios, using the hot
pressing method. A crucial point of this investigation is to show that this material is quite
versatile and possesses functional properties which are sensitive to both microscopic and
chemical modifications.
Detailed investigation of processed flexible films led to the main conclusion that
electrical properties of these composites can be affected by different factors. Firstly, the hotpressing
method itself induces the formation of electroactive β-phase of PVDF polymer, the
NBT-BT as filler with negatively charged surface enables a predominant formation of desirable
piezoelectric PVDF phase as well and additionally, there is an influence of concentration and
type (pre-preparation method) of the added filler.
Dielectric permittivity values of composites were up to 110 and highly depend on the
filler amount. A very useful zone around room temperature as a plateau with relatively constant
dielectric permittivity and losses was noticed in each film`s dielectric spectra. Anelastic
measurements have shown a complete agreement with dielectric properties in which the
temperature dependence of the Young’s modulus and the losses are dominated by those of the
polymer.
Regarding the resulting dielectric and ferroeletric properties of the flexible composites,
the potential of these materials for the energy storage application was investigated. Energy
density efficiencies obtained for investigated materials have shown a decreasing trend with
increasing amount of filler with values of 66-74 %.
Assembled energy harvesting units were made by proper wiring and covering the flexible
film with Kapton protection layer. The obtained output voltage while applying the impact force
was from 1 V to 7 V, depending on the type of the flexible film.
The main conclusion derived from this study is that composite flexible films made of
lead-free NBT-BT filler and PVDF, have high potential to be used for environmentally safe lowenergy
storage and energy harvesting devices.
PB  - IEEE ISAF-ISIF-PFM 2021, Sydney, Australia
C3  - IEEE ISAF-ISIF-PFM 2021, Sydney, Australia, May 16-21, 2021.
T1  - Composite flexible films prepared by hot pressing for low-energy harvesting and storage
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_2472
ER  - 

@conference{
author = "Vijatović Petrović, Mirjana and Craciun, Floriana and Cordero, Francesco and MERCADELLI, ELISA and Galassi, Carmen and Ilić, Nikola and Brunengo, Elisabetta and Despotovic, Zeljko V. and Bobić, Jelena and Džunuzović, Adis and Stagnaro, Paola",
year = "2021",
abstract = "The important task of scientific community nowadays is finding the way to use enormous
amount of mechanical energy released everywhere around us as a renewable and safe energy
source.
This research was focused on the preparation of flexible composite films, by combining a
highly flexible polyvinylidene fluoride (PVDF) polymer matrix with lead-free piezoelectric
perovskites, 0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3 (NBT-BT), in different ratios, using the hot
pressing method. A crucial point of this investigation is to show that this material is quite
versatile and possesses functional properties which are sensitive to both microscopic and
chemical modifications.
Detailed investigation of processed flexible films led to the main conclusion that
electrical properties of these composites can be affected by different factors. Firstly, the hotpressing
method itself induces the formation of electroactive β-phase of PVDF polymer, the
NBT-BT as filler with negatively charged surface enables a predominant formation of desirable
piezoelectric PVDF phase as well and additionally, there is an influence of concentration and
type (pre-preparation method) of the added filler.
Dielectric permittivity values of composites were up to 110 and highly depend on the
filler amount. A very useful zone around room temperature as a plateau with relatively constant
dielectric permittivity and losses was noticed in each film`s dielectric spectra. Anelastic
measurements have shown a complete agreement with dielectric properties in which the
temperature dependence of the Young’s modulus and the losses are dominated by those of the
polymer.
Regarding the resulting dielectric and ferroeletric properties of the flexible composites,
the potential of these materials for the energy storage application was investigated. Energy
density efficiencies obtained for investigated materials have shown a decreasing trend with
increasing amount of filler with values of 66-74 %.
Assembled energy harvesting units were made by proper wiring and covering the flexible
film with Kapton protection layer. The obtained output voltage while applying the impact force
was from 1 V to 7 V, depending on the type of the flexible film.
The main conclusion derived from this study is that composite flexible films made of
lead-free NBT-BT filler and PVDF, have high potential to be used for environmentally safe lowenergy
storage and energy harvesting devices.",
publisher = "IEEE ISAF-ISIF-PFM 2021, Sydney, Australia",
journal = "IEEE ISAF-ISIF-PFM 2021, Sydney, Australia, May 16-21, 2021.",
title = "Composite flexible films prepared by hot pressing for low-energy harvesting and storage",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2472"
}

Vijatović Petrović, M., Craciun, F., Cordero, F., MERCADELLI, E., Galassi, C., Ilić, N., Brunengo, E., Despotovic, Z. V., Bobić, J., Džunuzović, A.,& Stagnaro, P.. (2021). Composite flexible films prepared by hot pressing for low-energy harvesting and storage. in IEEE ISAF-ISIF-PFM 2021, Sydney, Australia, May 16-21, 2021.
IEEE ISAF-ISIF-PFM 2021, Sydney, Australia..
https://hdl.handle.net/21.15107/rcub_rimsi_2472

Vijatović Petrović M, Craciun F, Cordero F, MERCADELLI E, Galassi C, Ilić N, Brunengo E, Despotovic ZV, Bobić J, Džunuzović A, Stagnaro P. Composite flexible films prepared by hot pressing for low-energy harvesting and storage. in IEEE ISAF-ISIF-PFM 2021, Sydney, Australia, May 16-21, 2021.. 2021;.
https://hdl.handle.net/21.15107/rcub_rimsi_2472 .

Vijatović Petrović, Mirjana, Craciun, Floriana, Cordero, Francesco, MERCADELLI, ELISA, Galassi, Carmen, Ilić, Nikola, Brunengo, Elisabetta, Despotovic, Zeljko V., Bobić, Jelena, Džunuzović, Adis, Stagnaro, Paola, "Composite flexible films prepared by hot pressing for low-energy harvesting and storage" in IEEE ISAF-ISIF-PFM 2021, Sydney, Australia, May 16-21, 2021. (2021),
https://hdl.handle.net/21.15107/rcub_rimsi_2472 .