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Modification in the crystallinity, optical and dielectric behavior of PVA polymer with CaTiO3 and graphite nanoflakes

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Abstract

Calcium titanate powder CaTiO3 was subjected to heat treatment and utilized to fabricate hybrid nanocomposite films of polyvinyl alcohol (PVA)/graphite nanoflakes by solution casting technique. The effects of various content of graphite (0, 4, and 8 wt%) on the crystal microstructure, optical parameters, and dielectric behavior of the PVA containing 4wt% of CaTiO3 were investigated. The X-ray diffraction analysis showed a heat treatment of CaTiO3 increased the crystal size and lattice strain. The addition of graphite into the PVA containing heat-treated CaTiO3 weakened the intensity of the main diffraction peaks in PVA films, indicating the drop of crystallinity. The optical absorption spectrum revealed a greater value of optical absorption and index of refraction for the PVA blend containing thermal-treated CaTiO3 than untreated CaTiO3. The incorporation of thermal-treated calcium titanate with graphite dropped the optical energy gap of PVA from 6.4 to 5.2 eV. That was followed by a subsequent increment in the value of Urbach energy in the prepared composite films. Dielectric characterizations showed the addition of heat-treated calcium titanate with graphite improved the low-frequency dielectric constant of the polymer and enhanced the ac conductivity by up to seven orders of magnitude. The increase of ac conductivity was found to be consistent with the rise in the value of loss tangent in the nanocomposite.

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Acknowledgements

I gratefully acknowledge the support from the University of Sulaimani, College of Science-Department of Physics, for this research.

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  1. Advanced Polymeric Materials Research Laboratory, Department of Physics, College of Science, University of Sulaimani, Sulaimani, 46001, Kurdistan Regional Government, Iraq

    Gulstan Serwan Ezat

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Ezat, G.S. Modification in the crystallinity, optical and dielectric behavior of PVA polymer with CaTiO3 and graphite nanoflakes. Appl. Phys. A 130, 115 (2024). https://doi.org/10.1007/s00339-024-07276-2

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