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Structure and conductivity studies of PTh-Ni composites

Author Affiliations

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

Res. J. Physical Sci., Volume 3, Issue (9), Pages 5-10, November,4 (2015)

Abstract

Polythiophene (PTh) has been made by chemical oxidation method at 275 K using FeCl3 as an oxidant. Nickel nanoparticles were synthesized by modified polyol process. PTh and Ni nanoparticles were mixed mechanically in different weight percentages and the composites were prepared. Pure PTh, Ni nanoparticles and composites were characterized by XRD and SEM techniques. Electrical conductivity of pure PTh and PTh-Ni nanocomposites has been investigated for the temperature range from 303 K to 473 K. Temperature variation of conductivity revealed semiconducting nature. Conductivity of the composites has been found to be decreasing with increase of Ni in the composites. Mott’s Small Polaron Hopping (SPH) and Variable Range Hopping (VRH) models were applied to understand temperature behavior of conductivity. Activation energy for conduction and density of levels at Fermi energy were determined. Activation energy for conduction is found to be decreased with increasing weight percentage of Ni in the composites. For the first time PTh-Ni composites have been studied for temperature variation of conductivity and data analyzed thoroughly.

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