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Frequency dispersion and Temperature variation of Dielectric properties in PPy-Cu Nanocomposites

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Author Affiliations

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

Res. J. Physical Sci., Volume 3, Issue (5), Pages 6-10, July,4 (2015)

Abstract

Nanocomposites of Polypyrrole-copper (PPy-Cu) were synthesized by mixing independently prepared Polypyrrole and copper nanoparticles, in different weight percentages. Dielectric properties were measured as a function of temperature in the range from 300K to 550K and frequency in the range from 50Hz to 1MHz. Dielectric constant decreased with increase in frequency and temperature. Dielectric loss decreased as the frequency and temperature are increased. Using dielectric data, ac conductivity has been determined. Conductivity was found to be in the order of 10-3 (Ω-1m-1) and exhibited semiconducting behavior with respect to temperature. Using Mott’s polaron hopping model to the conductivity data, activation energy for conduction has been obtained. Activation energy was found to be in the order of a meV and it has increased with increase in frequency and Cu nanoparticles content. It is for the first time PPy-Cu nanocomposites were investigated for dielectric properties with frequency and temperature as variable over wide ranges and data analyzed thoroughly.

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