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VAIBHAV KHIRATKAR
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Volume 41 Issue 4 August 2018 Article ID 0107
VAIBHAV KHIRATKAR RADHAMANOHAR AEPURU H S PANDA
Perovskite-based flexible nanocomposites were realized by dispersing BaTiO$_3$ and modified monodisperse BaTiO$_3$ in PVDF–HFP matrix. BaTiO$_3$ was modified
in situ by the addition of carbon solution, which was prepared electrochemically by using graphite rod. Structural characterization revealed that the decrease in tetragonality due to reductionin particle size of modified BaTiO$_3$ than unmodified BaTiO$_3$. The controlled morphology of treated-BaTiO$_3$ nanoparticles was well dispersed in polymer matrix and exhibited effective dielectric constant.High active surface area of modified BaTiO$_3$ suggested strong interfacial polarization, reduced dielectric loss and induced relaxation as compared to PVDF–HFP/BTnanocomposite. The experimental dielectric behaviour was fitted with theoretical Maxwell–Garnet model and composites followed up to 20 wt.% filler. The polarization effect was further proven by electric modulus studies of nanocomposites in broad frequency (0.1 Hz–1 MHz) and temperature ($−$40 to 130$^{\circ}$C). The results suggested that the shift in relaxation peakstowards higher frequencies with increase in filler content in polymer matrix. Further, a flexible-pressure sensing device was fabricated and evaluated for real applications.
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Bulletin of Materials Science
Volume 43, 2020
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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