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Effect of holmium oxide on impedance and dielectric behavior of polyaniline–holmium oxide composites

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Abstract

Applying chemical in situ polymerization method, conducting polyaniline–holmium oxide (PANI/Ho2O3) composites with varying wt% of Ho2O3 in PANI were prepared. Composites were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy. Room temperature frequency response conductivity and the dielectric studies of the as synthesized composites were investigated in the range 50 to 106 Hz. AC conductivity was found to decrease with the increasing wt% of Ho2O3. Further, conductivity of the composites obeyed power law of disordered materials. Cole–Cole plots for each composite, depicted single semicircle inferring that the conduction is due to the hopping of charge carriers. With increasing wt% of Ho2O3, dielectric constant and dielectric loss both decreased and at low frequencies, high dielectric constant of the composites, found decreasing with increasing applied frequencies due to Maxwell–Wagner type polarization. Tangent loss plots showed relaxation peaks at the resonant frequency.

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Acknowledgements

Authors acknowledge Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru, in providing facilities for structural characterization of the samples. S. Manjunatha thanks Sri D. K. Mohan, Chairman, Dr. L. Suresh, Principal, Cambridge Institute of Technology, Bengaluru for their support in research activity. All the authors render special thanks to Dr. Yashvanth Bhupal, Director and Prof. Y.J. Prithviraj, Dep. Director, Ballari Institute of Technology & Management, Ballari for their encouragement.

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Authors and Affiliations

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

    S. Manjunatha, A. Sunilkumar & T. Machappa

  2. Department of Physics, Cambridge Institute of Technology, Bengaluru, 560036, India

    S. Manjunatha

  3. Department of PG Studies & Research in Physics, Govt. Science College, Chitradurga, 577501, India

    Y. T. Ravikiran

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  1. S. Manjunatha
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  2. A. Sunilkumar
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  3. Y. T. Ravikiran
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Correspondence to Y. T. Ravikiran or T. Machappa.

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Manjunatha, S., Sunilkumar, A., Ravikiran, Y.T. et al. Effect of holmium oxide on impedance and dielectric behavior of polyaniline–holmium oxide composites. J Mater Sci: Mater Electron 30, 10332–10341 (2019). https://doi.org/10.1007/s10854-019-01371-4

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  • DOI: https://doi.org/10.1007/s10854-019-01371-4

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