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DC Conduction in Polythiophene Nanocomposites doped with V2O5

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Author Affiliations

  • 1 Department of Physics, Gulbarga University, Gulbarga-585106, Karnataka, INDIA

Res. J. Material Sci., Volume 3, Issue (3), Pages 1-6, July,16 (2015)

Abstract

Polythiophene (PTh) has been prepared at 323K by an oxidation method using ferric chloride as an oxidizing agent. The Pth-VO composites were prepared by mechanical mixing of PTh and V2O5 in different wt%. PTh were confirmed to be 2O5 structure. Using XRD peaks, grain sizes were estimated. They were found to be nanocrystalline. SEM image of pure V2O5 showed nano size grains and SEM images of PTh-VO composites exhibited nano size grains and some tubular structure. Temperature dependence of conductivity has been determined in the temperature range from 300K to 425K and found to be semiconducting type. Conductivity behaviour with temperature has been analyzed in view of Mott’s small polaron and variable range hopping models. Activation energy, Ea for dc conduction was deduced and its value was found to be the fraction of an eV for all the samples. With increase in V2O5 content, Ea decreased and σ increased. Density of states of charge carriers at the Fermi level was determined.

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