Sreemanta Mitra, Dipankar Chakravorty
Graphene/(Poly)vinyl alcohol (PVA) composite films with thickness $60 \mu m$ were synthesized by solidification of a PVA solution comprising of dispersed graphene nanosheets. The close proximity of the graphene sheets enables the tunneling of electrons from one sheet to another. The dielectric data show that the present system can be simulated to a parallel resistance-capacitor network. The high frequency exponent of the frequency variation of the ac conductivity indicates that the charge carriers move in a two-dimensional space.
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http://arxiv.org/abs/1204.2126
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