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Aleksić, Obrad S.

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  • Aleksić, Obrad S. (2)
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Author's Bibliography

Humidity sensing potential of Fe2TiO5—pseudobrookite

Nikolić, Maria Vesna; Luković, Miloljub D.; Vasiljević, Zorka Ž.; Labus, Nebojša; Aleksić, Obrad S.

(Springer US, 2018)

TY  - JOUR
AU  - Nikolić, Maria Vesna
AU  - Luković, Miloljub D.
AU  - Vasiljević, Zorka Ž.
AU  - Labus, Nebojša
AU  - Aleksić, Obrad S.
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4650
AB  - Bulk samples of pseudobrookite with an orthorhombic crystal structure were prepared by sintering a mixture of starting hematite and anatase nano powders in the weight ratio 60:40 at three different sintering temperatures (950, 1050 and 1150 °C) resulting in different microstructures determined by SEM analysis. Humidity sensing properties of pseudobrookite were investigated by measuring changes in electrical properties at operating temperatures of 20, 40 and 60 °C in the frequency range 100 Hz–100 kHz in the relative humidity range 30–90% in a climatic chamber. At 100 Hz, and 20 °C the impedance of pseudobrookite sintered at 1150 °C reduced over 5 times in the humidity range 40–90%, and 7 times at 60 °C for pseudobrookite sintered at 950 °C. Detailed analysis of dielectric properties showed that the dielectric constant increased noticeably with increase in humidity at low frequencies. Electrical conductivity change with frequency followed the Jonscher power law, and increased with increase in relative humidity. The determined frequency constant reduced with increase in sample temperature and increase in relative humidity. The conduction mechanism can be explained using the correlated barrier hopping model. Analysis of complex impedance using an equivalent circuit showed the dominant influence of grain boundaries. Low hysteresis (3.6 and 2.99%) was obtained in the 40–90% humidity range at room temperature (25 °C) for pseudobrookite sintered at 950 and 1150 °C. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
PB  - Springer US
T2  - Journal of Materials Science: Materials in Electronics
T1  - Humidity sensing potential of Fe2TiO5—pseudobrookite
SP  - 9227
EP  - 9238
VL  - 29
IS  - 11
DO  - 10.1007/s10854-018-8951-1
ER  - 
@article{
author = "Nikolić, Maria Vesna and Luković, Miloljub D. and Vasiljević, Zorka Ž. and Labus, Nebojša and Aleksić, Obrad S.",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4650",
abstract = "Bulk samples of pseudobrookite with an orthorhombic crystal structure were prepared by sintering a mixture of starting hematite and anatase nano powders in the weight ratio 60:40 at three different sintering temperatures (950, 1050 and 1150 °C) resulting in different microstructures determined by SEM analysis. Humidity sensing properties of pseudobrookite were investigated by measuring changes in electrical properties at operating temperatures of 20, 40 and 60 °C in the frequency range 100 Hz–100 kHz in the relative humidity range 30–90% in a climatic chamber. At 100 Hz, and 20 °C the impedance of pseudobrookite sintered at 1150 °C reduced over 5 times in the humidity range 40–90%, and 7 times at 60 °C for pseudobrookite sintered at 950 °C. Detailed analysis of dielectric properties showed that the dielectric constant increased noticeably with increase in humidity at low frequencies. Electrical conductivity change with frequency followed the Jonscher power law, and increased with increase in relative humidity. The determined frequency constant reduced with increase in sample temperature and increase in relative humidity. The conduction mechanism can be explained using the correlated barrier hopping model. Analysis of complex impedance using an equivalent circuit showed the dominant influence of grain boundaries. Low hysteresis (3.6 and 2.99%) was obtained in the 40–90% humidity range at room temperature (25 °C) for pseudobrookite sintered at 950 and 1150 °C. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.",
publisher = "Springer US",
journal = "Journal of Materials Science: Materials in Electronics",
title = "Humidity sensing potential of Fe2TiO5—pseudobrookite",
pages = "9227-9238",
volume = "29",
number = "11",
doi = "10.1007/s10854-018-8951-1"
}
Nikolić, M. V., Luković, M. D., Vasiljević, Z. Ž., Labus, N.,& Aleksić, O. S. (2018). Humidity sensing potential of Fe2TiO5—pseudobrookite.
Journal of Materials Science: Materials in ElectronicsSpringer US., 29(11), 9227-9238.
https://doi.org/10.1007/s10854-018-8951-1
Nikolić MV, Luković MD, Vasiljević ZŽ, Labus N, Aleksić OS. Humidity sensing potential of Fe2TiO5—pseudobrookite. Journal of Materials Science: Materials in Electronics. 2018;29(11):9227-9238
Nikolić Maria Vesna, Luković Miloljub D., Vasiljević Zorka Ž., Labus Nebojša, Aleksić Obrad S., "Humidity sensing potential of Fe2TiO5—pseudobrookite" 29, no. 11 (2018):9227-9238,
https://doi.org/10.1007/s10854-018-8951-1 .
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Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films

Peleš, Adriana; Aleksić, Obrad S.; Pavlović, Vera P.; Đoković, Vladimir; Dojčilović, Radovan; Nikolić, Z.; Marinković, F.; Mitrić, Miodrag; Blagojević, Vladimir A.; Vlahović, Branislav; Pavlović, Vladimir B.

(IOP Publishing, 2018)

TY  - JOUR
AU  - Peleš, Adriana
AU  - Aleksić, Obrad S.
AU  - Pavlović, Vera P.
AU  - Đoković, Vladimir
AU  - Dojčilović, Radovan
AU  - Nikolić, Z.
AU  - Marinković, F.
AU  - Mitrić, Miodrag
AU  - Blagojević, Vladimir A.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4079
AB  - The influence of the mechanical activation of ZnO nanoparticle fillers on the structural and electrical properties of the matrix of poly(vinylidenefluoride)-ZnO (PVDF-ZnO) films was investigated. Transmission electron microscopy and scanning electron microscopy analyses showed that mechanical activation in a high energy planetary ball mill reduces the size of ZnO particles. X-ray diffraction and Raman spectroscopy revealed that PVDF crystallized predominantly as the γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-phase, indicating that mechanical activation of the filler can be used as a general method for fabrication of PVDF composites with increased content of piezoelectric β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-phase (with ZnO filler activated for 5 min) exhibits the highest value of dielectric permittivity in 150-400 K range of temperatures. Kinetic analysis shows combined effects of increased surface area and increased concentration of surface defects on the interactions between polymer chains and activated nanoparticles. © 2018 IOP Publishing Ltd.
PB  - IOP Publishing
T2  - Physica Scripta
T1  - Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films
SP  - 105801
VL  - 93
DO  - 10.1088/1402-4896/aad749
ER  - 
@article{
author = "Peleš, Adriana and Aleksić, Obrad S. and Pavlović, Vera P. and Đoković, Vladimir and Dojčilović, Radovan and Nikolić, Z. and Marinković, F. and Mitrić, Miodrag and Blagojević, Vladimir A. and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4079",
abstract = "The influence of the mechanical activation of ZnO nanoparticle fillers on the structural and electrical properties of the matrix of poly(vinylidenefluoride)-ZnO (PVDF-ZnO) films was investigated. Transmission electron microscopy and scanning electron microscopy analyses showed that mechanical activation in a high energy planetary ball mill reduces the size of ZnO particles. X-ray diffraction and Raman spectroscopy revealed that PVDF crystallized predominantly as the γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-phase, indicating that mechanical activation of the filler can be used as a general method for fabrication of PVDF composites with increased content of piezoelectric β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-phase (with ZnO filler activated for 5 min) exhibits the highest value of dielectric permittivity in 150-400 K range of temperatures. Kinetic analysis shows combined effects of increased surface area and increased concentration of surface defects on the interactions between polymer chains and activated nanoparticles. © 2018 IOP Publishing Ltd.",
publisher = "IOP Publishing",
journal = "Physica Scripta",
title = "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films",
pages = "105801",
volume = "93",
doi = "10.1088/1402-4896/aad749"
}
Peleš, A., Aleksić, O. S., Pavlović, V. P., Đoković, V., Dojčilović, R., Nikolić, Z., Marinković, F., Mitrić, M., Blagojević, V. A., Vlahović, B.,& Pavlović, V. B. (2018). Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films.
Physica ScriptaIOP Publishing., 93, 105801.
https://doi.org/10.1088/1402-4896/aad749
Peleš A, Aleksić OS, Pavlović VP, Đoković V, Dojčilović R, Nikolić Z, Marinković F, Mitrić M, Blagojević VA, Vlahović B, Pavlović VB. Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films. Physica Scripta. 2018;93:105801
Peleš Adriana, Aleksić Obrad S., Pavlović Vera P., Đoković Vladimir, Dojčilović Radovan, Nikolić Z., Marinković F., Mitrić Miodrag, Blagojević Vladimir A., Vlahović Branislav, Pavlović Vladimir B., "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films" 93 (2018):105801,
https://doi.org/10.1088/1402-4896/aad749 .
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