Graphene-Polyvinyl alcohol (PVA) nanocomposite films with thickness 120μm were synthesized by solidification of PVA in a solution with dispersed graphene nanosheets. Electrical conductivity data were explained as arising due to hopping of carriers between localized states formed at the graphene-PVA interface. Dielectric permittivity data as a function of frequency indicated the occurrence of Debye-type relaxation mechanism. The nanocomposites showed a magnetodielectric effect with the dielectric constant changing by 1.8% as the magnetic field was increased to 1 Tesla. The effect was explained as arising due to Maxwell-Wagner polarization as applied to an inhomogeneous two-dimensional,two-component composite model. This type of nanocomposite may be suitable for applications involving nanogenerators.
@article{arxiv.1205.0384,
title = {Magnetodielectric effect of Graphene-PVA Nanocomposites},
author = {Sreemanta Mitra and Oindrila Mondal and Dhriti ranjan Saha and Anindya Datta and Sourish Banerjee and Dipankar Chakravorty},
journal= {arXiv preprint arXiv:1205.0384},
year = {2012}
}