TY  - JOUR
AU  - Petrović Vijatović, M.
AU  - Craciun, F.
AU  - Cordero, F.
AU  - Mercadelli, E.
AU  - Ilić, Nikola
AU  - Despotović, Z.
AU  - Bobić, J.
AU  - Džunuzovć, A.
AU  - Galassi, C.
AU  - Stagnaro, P.
AU  - Canu, G.
AU  - Buscaglia, M. T.
AU  - Brunengo, E.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12399
AB  - In order to further improve the performance of 0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3/polyvinylidene fluoride (NBT-BT/PVDF) flexible composite films prepared by the hot-pressing method, the effect of surface modification of the NBT-BT particles on the structure and properties of the films was investigated. Two coupling agents, namely, (3-aminopropyl)triethoxysilane (APTES) and dodecyl triethoxysilane (DDTES) were added to enhance dispersion and interfacial adhesion of the active phase powder with the polymer matrix. The highest amount of the electroactive PVDF β-phase was formed in APTES-modified samples while in DDTES samples mainly γ-phase was formed as shown by Fourier-transform infrared spectroscopy analysis. Differential scanning calorimetry measurements indicated that the addition of filler particles reduced the total crystallinity degree of the PVDF. Dielectric permittivity values as well as 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. The highest level of agglomeration in the DDTES-modified samples induced the deterioration of ferroelectric properties. The highest voltage output of ~15 V and 225 μW of power was obtained for the APTES-modified harvester, evidencing their potential for energy harvesting applications.
T2  - Polymer Composites
T1  - Advantages and limitations of active phase silanization in                    PVDF                    composites: Focus on electrical properties and energy harvesting potential
DO  - 10.1002/pc.28071
ER  - 

@article{
author = "Petrović Vijatović, M. and Craciun, F. and Cordero, F. and Mercadelli, E. and Ilić, Nikola and Despotović, Z. and Bobić, J. and Džunuzovć, A. and Galassi, C. and Stagnaro, P. and Canu, G. and Buscaglia, M. T. and Brunengo, E.",
year = "2023",
abstract = "In order to further improve the performance of 0.94[(Bi0.5Na0.5)TiO3]-0.06BaTiO3/polyvinylidene fluoride (NBT-BT/PVDF) flexible composite films prepared by the hot-pressing method, the effect of surface modification of the NBT-BT particles on the structure and properties of the films was investigated. Two coupling agents, namely, (3-aminopropyl)triethoxysilane (APTES) and dodecyl triethoxysilane (DDTES) were added to enhance dispersion and interfacial adhesion of the active phase powder with the polymer matrix. The highest amount of the electroactive PVDF β-phase was formed in APTES-modified samples while in DDTES samples mainly γ-phase was formed as shown by Fourier-transform infrared spectroscopy analysis. Differential scanning calorimetry measurements indicated that the addition of filler particles reduced the total crystallinity degree of the PVDF. Dielectric permittivity values as well as 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. The highest level of agglomeration in the DDTES-modified samples induced the deterioration of ferroelectric properties. The highest voltage output of ~15 V and 225 μW of power was obtained for the APTES-modified harvester, evidencing their potential for energy harvesting applications.",
journal = "Polymer Composites",
title = "Advantages and limitations of active phase silanization in                    PVDF                    composites: Focus on electrical properties and energy harvesting potential",
doi = "10.1002/pc.28071"
}

Petrović Vijatović, M., Craciun, F., Cordero, F., Mercadelli, E., Ilić, N., Despotović, Z., Bobić, J., Džunuzovć, A., Galassi, C., Stagnaro, P., Canu, G., Buscaglia, M. T.,& Brunengo, E.. (2023). Advantages and limitations of active phase silanization in                    PVDF                    composites: Focus on electrical properties and energy harvesting potential. in Polymer Composites.
https://doi.org/10.1002/pc.28071

Petrović Vijatović M, Craciun F, Cordero F, Mercadelli E, Ilić N, Despotović Z, Bobić J, Džunuzovć A, Galassi C, Stagnaro P, Canu G, Buscaglia MT, Brunengo E. Advantages and limitations of active phase silanization in                    PVDF                    composites: Focus on electrical properties and energy harvesting potential. in Polymer Composites. 2023;.
doi:10.1002/pc.28071 .

Petrović Vijatović, M., Craciun, F., Cordero, F., Mercadelli, E., Ilić, Nikola, Despotović, Z., Bobić, J., Džunuzovć, A., Galassi, C., Stagnaro, P., Canu, G., Buscaglia, M. T., Brunengo, E., "Advantages and limitations of active phase silanization in                    PVDF                    composites: Focus on electrical properties and energy harvesting potential" in Polymer Composites (2023),
https://doi.org/10.1002/pc.28071 . .

TY  - JOUR
AU  - Bobić, Jelena
AU  - Ilić, Nikola
AU  - Despotović, Željko
AU  - Džunuzović, Adis
AU  - Grigalaitis, Robertas
AU  - Stijepović, Ivan
AU  - Stojanović, Biljana
AU  - Vijatović Petrović, Mirjana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11460
AB  - For the last several decades, energy harvesters based on piezoelectricity from mechanical vibration have emerged as very promising devices that are being explored extensively for their functionality in energy technologies. In this paper, a series of flexible lead-free BaZr0.2Ti0.8O3 (BZT)/PVDF and lead-based PbZr0.52Ti0.48O3 (PZT)/PVDF piezocomposites with variable filler content up to 50 vol% were prepared by a hot pressing method. The structure and morphology of the BZT and PZT powders, as well as the distribution of the piezo-active filler in the obtained flexible films were characterized by XRD and SEM analysis. In addition, the remnant polarization (Pr) and leakage current were also investigated to evaluate the breakdown strength in both types of flexible films. The calculations of storage energies and output voltage obtained for the investigated materials revealed an increasing trend with an increasing amount of BZT and PZT active phases. The maximum storage energy of 0.42 J/cm3 (and energy efficiency of 40.7 %) was obtained for the PZT–PVDF (40–60) films, while the maximum output voltage of about 10 V (~10 µA) was obtained for the PZT–PVDF (50–50) flexible film. In addition, a comparison between the properties of the lead-based and lead-free flexible films, as well as the potential use of these films as energy storage and energy harvesting systems were analyzed.
T2  - Crystals
T1  - Properties and Potential Application of Lead-Free (BaZr0.2Ti0.8O3) and Lead-Based (PbZr0.52Ti0.48O3) Flexible Thick Films
VL  - 13
IS  - 8
SP  - 1178
DO  - 10.3390/cryst13081178
ER  - 

@article{
author = "Bobić, Jelena and Ilić, Nikola and Despotović, Željko and Džunuzović, Adis and Grigalaitis, Robertas and Stijepović, Ivan and Stojanović, Biljana and Vijatović Petrović, Mirjana",
year = "2023",
abstract = "For the last several decades, energy harvesters based on piezoelectricity from mechanical vibration have emerged as very promising devices that are being explored extensively for their functionality in energy technologies. In this paper, a series of flexible lead-free BaZr0.2Ti0.8O3 (BZT)/PVDF and lead-based PbZr0.52Ti0.48O3 (PZT)/PVDF piezocomposites with variable filler content up to 50 vol% were prepared by a hot pressing method. The structure and morphology of the BZT and PZT powders, as well as the distribution of the piezo-active filler in the obtained flexible films were characterized by XRD and SEM analysis. In addition, the remnant polarization (Pr) and leakage current were also investigated to evaluate the breakdown strength in both types of flexible films. The calculations of storage energies and output voltage obtained for the investigated materials revealed an increasing trend with an increasing amount of BZT and PZT active phases. The maximum storage energy of 0.42 J/cm3 (and energy efficiency of 40.7 %) was obtained for the PZT–PVDF (40–60) films, while the maximum output voltage of about 10 V (~10 µA) was obtained for the PZT–PVDF (50–50) flexible film. In addition, a comparison between the properties of the lead-based and lead-free flexible films, as well as the potential use of these films as energy storage and energy harvesting systems were analyzed.",
journal = "Crystals",
title = "Properties and Potential Application of Lead-Free (BaZr0.2Ti0.8O3) and Lead-Based (PbZr0.52Ti0.48O3) Flexible Thick Films",
volume = "13",
number = "8",
pages = "1178",
doi = "10.3390/cryst13081178"
}

Bobić, J., Ilić, N., Despotović, Ž., Džunuzović, A., Grigalaitis, R., Stijepović, I., Stojanović, B.,& Vijatović Petrović, M.. (2023). Properties and Potential Application of Lead-Free (BaZr0.2Ti0.8O3) and Lead-Based (PbZr0.52Ti0.48O3) Flexible Thick Films. in Crystals, 13(8), 1178.
https://doi.org/10.3390/cryst13081178

Bobić J, Ilić N, Despotović Ž, Džunuzović A, Grigalaitis R, Stijepović I, Stojanović B, Vijatović Petrović M. Properties and Potential Application of Lead-Free (BaZr0.2Ti0.8O3) and Lead-Based (PbZr0.52Ti0.48O3) Flexible Thick Films. in Crystals. 2023;13(8):1178.
doi:10.3390/cryst13081178 .

Bobić, Jelena, Ilić, Nikola, Despotović, Željko, Džunuzović, Adis, Grigalaitis, Robertas, Stijepović, Ivan, Stojanović, Biljana, Vijatović Petrović, Mirjana, "Properties and Potential Application of Lead-Free (BaZr0.2Ti0.8O3) and Lead-Based (PbZr0.52Ti0.48O3) Flexible Thick Films" in Crystals, 13, no. 8 (2023):1178,
https://doi.org/10.3390/cryst13081178 . .

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Ammar, Souad
AU  - Ilić, Nikola
AU  - Singh, Charanjeet
AU  - Dojčinović, Milena
AU  - Jotania, Rajshree
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11874
AB  - SrCo0.2Zn0.2Fe11.6O18.8 hexaferrite was obtained by a “one-pot” green sol-gel synthesismethod utilizing aqueous mandarin orange (Citrus reticulata) peel extract as an eco-friendly reactant.The research objective was to analyze the influence of cobalt and zinc co-doping and the synthesisprocess on the structure, morphology, magnetic, dielectric and ferroelectric properties of strontiumhexaferrite in view of future applications. Structural and morphological characterization usingX-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electronmicroscopy coupled to energy dispersive X-ray spectrometry (SEM-EDX) confirmed the formationof a Co and Zn ion incorporated M-type magnetoplumbite with c/a lattice parameter ratio of 3.919as crystallite nanoplatelets of 32 and 53 nm in thickness and width, respectively. The magnetichysteresis loop of the synthesized powder recorded by a vibrating sample magnetometer (VSM) atroom temperature confirmed its ferromagnetic nature with a coercive field (Hc) of 2539 Oe and asaturation magnetization (Ms) and remanent magnetization (Mr) of 44.6 emu/g and 21.4 emu/g,respectively. Room temperature ferroelectric loops measured at 100 Hz showed a maximal (Pmax)and a remanent (Pr) polarization of 195.4 and 31.0 nC/cm2, respectively. Both increased when themagnitude of the applied electrical field increased in the 1–24 kV/cm range. The dielectric constantdecreased with the frequency increase, in accordance with the Maxwell–Wagner model, while theconductivity changed according to the Jonscher power law. The complex impedance was modeledwith an equivalent circuit, enabling identification of the dominant contribution of grain boundaryresistance (272.3 MW) and capacitance (7.16 pF).
T2  - Crystals
T1  - Ferroelectric, Magnetic and Dielectric Properties of SrCo0.2Zn0.2Fe11.6O18.8 Hexaferrite Obtained by “One-Pot” Green Sol-Gel Synthesis Utilizing Citrus reticulata Peel Extract
VL  - 13
IS  - 1452
DO  - 10.3390/cryst13101452
ER  - 

@article{
author = "Nikolić, Maria Vesna and Ammar, Souad and Ilić, Nikola and Singh, Charanjeet and Dojčinović, Milena and Jotania, Rajshree",
year = "2023",
abstract = "SrCo0.2Zn0.2Fe11.6O18.8 hexaferrite was obtained by a “one-pot” green sol-gel synthesismethod utilizing aqueous mandarin orange (Citrus reticulata) peel extract as an eco-friendly reactant.The research objective was to analyze the influence of cobalt and zinc co-doping and the synthesisprocess on the structure, morphology, magnetic, dielectric and ferroelectric properties of strontiumhexaferrite in view of future applications. Structural and morphological characterization usingX-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electronmicroscopy coupled to energy dispersive X-ray spectrometry (SEM-EDX) confirmed the formationof a Co and Zn ion incorporated M-type magnetoplumbite with c/a lattice parameter ratio of 3.919as crystallite nanoplatelets of 32 and 53 nm in thickness and width, respectively. The magnetichysteresis loop of the synthesized powder recorded by a vibrating sample magnetometer (VSM) atroom temperature confirmed its ferromagnetic nature with a coercive field (Hc) of 2539 Oe and asaturation magnetization (Ms) and remanent magnetization (Mr) of 44.6 emu/g and 21.4 emu/g,respectively. Room temperature ferroelectric loops measured at 100 Hz showed a maximal (Pmax)and a remanent (Pr) polarization of 195.4 and 31.0 nC/cm2, respectively. Both increased when themagnitude of the applied electrical field increased in the 1–24 kV/cm range. The dielectric constantdecreased with the frequency increase, in accordance with the Maxwell–Wagner model, while theconductivity changed according to the Jonscher power law. The complex impedance was modeledwith an equivalent circuit, enabling identification of the dominant contribution of grain boundaryresistance (272.3 MW) and capacitance (7.16 pF).",
journal = "Crystals",
title = "Ferroelectric, Magnetic and Dielectric Properties of SrCo0.2Zn0.2Fe11.6O18.8 Hexaferrite Obtained by “One-Pot” Green Sol-Gel Synthesis Utilizing Citrus reticulata Peel Extract",
volume = "13",
number = "1452",
doi = "10.3390/cryst13101452"
}

Nikolić, M. V., Ammar, S., Ilić, N., Singh, C., Dojčinović, M.,& Jotania, R.. (2023). Ferroelectric, Magnetic and Dielectric Properties of SrCo0.2Zn0.2Fe11.6O18.8 Hexaferrite Obtained by “One-Pot” Green Sol-Gel Synthesis Utilizing Citrus reticulata Peel Extract. in Crystals, 13(1452).
https://doi.org/10.3390/cryst13101452

Nikolić MV, Ammar S, Ilić N, Singh C, Dojčinović M, Jotania R. Ferroelectric, Magnetic and Dielectric Properties of SrCo0.2Zn0.2Fe11.6O18.8 Hexaferrite Obtained by “One-Pot” Green Sol-Gel Synthesis Utilizing Citrus reticulata Peel Extract. in Crystals. 2023;13(1452).
doi:10.3390/cryst13101452 .

Nikolić, Maria Vesna, Ammar, Souad, Ilić, Nikola, Singh, Charanjeet, Dojčinović, Milena, Jotania, Rajshree, "Ferroelectric, Magnetic and Dielectric Properties of SrCo0.2Zn0.2Fe11.6O18.8 Hexaferrite Obtained by “One-Pot” Green Sol-Gel Synthesis Utilizing Citrus reticulata Peel Extract" in Crystals, 13, no. 1452 (2023),
https://doi.org/10.3390/cryst13101452 . .

TY  - JOUR
AU  - Ilić, Nikola
AU  - Teixeira, Guilhermina F.
AU  - Bobić, Jelena
AU  - Spasojević, Vojislav
AU  - Džunuzović, Adis
AU  - Petrović, Mirjana Vijatović
AU  - Zaghete, Maria Ap.
AU  - Stojanović, Biljana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10211
AB  - Bismuth ferrite (BiFeO3) powders were synthesized by auto-combustion method using glycine as a fuel. Doping ions of different valence were used to study the influence on electrical conductivity and ferroelectric properties. Powders were mixed and hot-pressed with α-PVDF to form flexible composite samples. Composites endured significantly higher electrical fields with lower leakage and retained the weak ferromagnetism present in powders. Dielectric properties were improved by doping with Zr4+, Y3+ and Ca2+ as well as the electrical resistivity. Flexible composites exhibited improved electrical resistivity and modified conduction mechanism. Relatively high magnetization of powders completely originates from magnetite particles formed during the combustion, while sintered samples exhibited typical antiferromagnetic behaviour.
T2  - Materials Science and Engineering: B
T1  - Auto-combustion synthesis as a method for preparing BiFeO3 powders and flexible BiFeO3/PVDF films with improved magnetic properties. Influence of doping ion position, size and valence on electric properties
VL  - 280
SP  - 115686
DO  - 10.1016/j.mseb.2022.115686
ER  - 

@article{
author = "Ilić, Nikola and Teixeira, Guilhermina F. and Bobić, Jelena and Spasojević, Vojislav and Džunuzović, Adis and Petrović, Mirjana Vijatović and Zaghete, Maria Ap. and Stojanović, Biljana",
year = "2022",
abstract = "Bismuth ferrite (BiFeO3) powders were synthesized by auto-combustion method using glycine as a fuel. Doping ions of different valence were used to study the influence on electrical conductivity and ferroelectric properties. Powders were mixed and hot-pressed with α-PVDF to form flexible composite samples. Composites endured significantly higher electrical fields with lower leakage and retained the weak ferromagnetism present in powders. Dielectric properties were improved by doping with Zr4+, Y3+ and Ca2+ as well as the electrical resistivity. Flexible composites exhibited improved electrical resistivity and modified conduction mechanism. Relatively high magnetization of powders completely originates from magnetite particles formed during the combustion, while sintered samples exhibited typical antiferromagnetic behaviour.",
journal = "Materials Science and Engineering: B",
title = "Auto-combustion synthesis as a method for preparing BiFeO3 powders and flexible BiFeO3/PVDF films with improved magnetic properties. Influence of doping ion position, size and valence on electric properties",
volume = "280",
pages = "115686",
doi = "10.1016/j.mseb.2022.115686"
}

Ilić, N., Teixeira, G. F., Bobić, J., Spasojević, V., Džunuzović, A., Petrović, M. V., Zaghete, M. Ap.,& Stojanović, B.. (2022). Auto-combustion synthesis as a method for preparing BiFeO3 powders and flexible BiFeO3/PVDF films with improved magnetic properties. Influence of doping ion position, size and valence on electric properties. in Materials Science and Engineering: B, 280, 115686.
https://doi.org/10.1016/j.mseb.2022.115686

Ilić N, Teixeira GF, Bobić J, Spasojević V, Džunuzović A, Petrović MV, Zaghete MA, Stojanović B. Auto-combustion synthesis as a method for preparing BiFeO3 powders and flexible BiFeO3/PVDF films with improved magnetic properties. Influence of doping ion position, size and valence on electric properties. in Materials Science and Engineering: B. 2022;280:115686.
doi:10.1016/j.mseb.2022.115686 .

Ilić, Nikola, Teixeira, Guilhermina F., Bobić, Jelena, Spasojević, Vojislav, Džunuzović, Adis, Petrović, Mirjana Vijatović, Zaghete, Maria Ap., Stojanović, Biljana, "Auto-combustion synthesis as a method for preparing BiFeO3 powders and flexible BiFeO3/PVDF films with improved magnetic properties. Influence of doping ion position, size and valence on electric properties" in Materials Science and Engineering: B, 280 (2022):115686,
https://doi.org/10.1016/j.mseb.2022.115686 . .