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Structural, dielectric, ac conductivity and electromagnetic shielding properties of polyaniline/Ni0.5Zn0.5Fe2O4 composites

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Abstract

A conducting polymer, polyaniline (PANI)/Ni0.5Zn0.5Fe2O4 composites with high dielectric absorbing properties and electromagnetic shielding effectiveness at low frequencies were successfully synthesized through a simple in situ emulsion polymerization. PANI was doped with hydrochloric acid to improve its electrical properties and interactions with ferrite particles. PANI/Ni0.5Zn0.5Fe2O4 composites were characterized by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and thermal gravimetric analysis. Frequency dependence of dielectric and ac conductivity (σac) studies have been undertaken on the PANI/Ni0.5Zn0.5Fe2O4 composites in the frequency range 50 Hz–5 MHz. The electrical conduction mechanism in the PANI/Ni0.5Zn0.5Fe2O4 is found to be in accordance with the electron hopping model. Further, frequency dependence of electromagnetic interference (EMI) shielding effectiveness (SE) is studied. The EMI shielding effectiveness is found to decrease with an increase in the frequency. The maximum value 55.14 dB of SE at 50 Hz was obtained at room temperature for PANI/Ni0.5Zn0.5Fe2O4 composites in the 50 Hz–5 MHz frequency range. PANI/Ni0.5Zn0.5Fe2O4 composites were demonstrated as a promising functional material for the absorbing of electromagnetic waves at low frequencies because of a large amount of dipole polarizations in the polymer backbone and at the interfaces of the Ni–Zn ferrite particles and PANI matrix.

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Acknowledgments

Authors wish to acknowledge the STIC, CUSAT, Cochin for XRD, SEM, TEM and TG analysis.

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Authors and Affiliations

  1. Post Graduate Department of Physics, Government Science College, Chitradurga, 577 501, India

    B. J. Madhu

  2. VTU Research Resource Centre, Belgaum, Karnataka, India

    M. Gurusiddesh & T. Kiran

  3. Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore, 560 056, India

    B. Shruthi

  4. Department of Physics, Kuvempu University, Shankaraghatta, 577 451, India

    H. S. Jayanna

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  1. B. J. Madhu
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  2. M. Gurusiddesh
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  3. T. Kiran
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  5. H. S. Jayanna
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Correspondence to B. J. Madhu.

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Madhu, B.J., Gurusiddesh, M., Kiran, T. et al. Structural, dielectric, ac conductivity and electromagnetic shielding properties of polyaniline/Ni0.5Zn0.5Fe2O4 composites. J Mater Sci: Mater Electron 27, 7760–7766 (2016). https://doi.org/10.1007/s10854-016-4764-2

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  • DOI: https://doi.org/10.1007/s10854-016-4764-2

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