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Magnetodielectric effect of Graphene-PVA Nanocomposites

Graphene-Polyvinyl alcohol (PVA) nanocomposite films with thickness $120 μm$ 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.

preprint2012arXivOpen access
Sreemanta MitraOindrila MondalDhriti ranjan SahaAnindya DattaSourish BanerjeeDipankar Chakravorty
cond-mat.mes-hallcond-mat.mtrl-sci
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Sreemanta MitraOindrila MondalDhriti ranjan SahaAnindya DattaSourish BanerjeeDipankar Chakravorty

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