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Tungsten disulfide: an efficient material in enhancement of AC conductivity and dielectric properties of polyaniline

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Abstract

Conducting polyaniline–tungsten disulfide (PANI–WS2) composites with 10, 20, 30, 40 and 50 wt% of WS2 in PANI were synthesized using one step in situ polymerization technique. Room temperature AC conductivity and the dielectric behavior of the aforementioned composites were investigated in the frequency range 50–106 Hz. Apart from obeying the power law above the critical frequency, indicating the universal behavior of disordered media; remarkable increase in conductivity of the composites by one order was observed. Complex plane impedance plots exhibited single semicircle for each composite, indicating the conduction mechanism is by hopping of charge carriers. High dielectric constant of order 106, at the lower frequency for the composites, started decreasing with increase in applied frequencies; this could be attributed to the Maxwell–Wagner polarization. Dielectric tangent loss curves exhibited peculiar peaks due to the relaxation loss at the resonant frequency of the hopping charge carriers and the applied AC field. Higher values of dielectric loss in the lower frequency range, make these materials as suitable candidates to design the medium frequency devices.

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Acknowledgements

S. Manjunatha acknowledges Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bangalore, in providing facilities for structural characterization of the samples and U. Gupta, Dr. P. Vishnoi for their useful discussions. Authors (S. Manjunatha, A. Sunilkumar and T. Machappa) render special thanks to Dr. Yashvanth Bhupal, Director of Ballari Institute of Technology and Management, Ballari for his support and encouragement.

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Authors and Affiliations

  1. Department of Physics, VTU Research Centre, Ballari Institute of Technology and Management, Ballari, 583104, India

    S. Manjunatha, T. Machappa & A. Sunilkumar

  2. Department of PG Studies and Research in Physics, Govt. Science College, Chitradurga, 577501, India

    Y. T. Ravikiran

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  1. S. Manjunatha
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  2. T. Machappa
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Correspondence to T. Machappa.

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Manjunatha, S., Machappa, T., Sunilkumar, A. et al. Tungsten disulfide: an efficient material in enhancement of AC conductivity and dielectric properties of polyaniline. J Mater Sci: Mater Electron 29, 11581–11590 (2018). https://doi.org/10.1007/s10854-018-9255-1

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