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Effect of Zn source concentration on structural, optical and electrical properties of zinc sulphide–polyaniline (ZnS–PANI) nanocomposite thin films

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Abstract

Zinc sulphide–polyaniline (ZnS–PANI) nanocomposites are prepared by preparing ZnS nanoparticles in the same reaction bath for synthesis of PANI. Three different composites have been prepared by varying the concentration of zinc source. The films obtained from the colloidal dispersion are characterized by Scanning electron microscopy, energy dispersive analysis of X-rays, transmission electron microscopy, X-ray diffraction studies, Fourier transform infrared spectroscopy, UV–visible optical absorption, photoluminescence and current–voltage studies. Broadening of X-ray diffraction peaks suggest change in crystallite size and this is in agreement with the results from transmission electron microscopy. Fourier transform infrared spectra indicate crosslinking in the composite film. UV–visible absorption spectra of the film exhibit enhancement of doping level which is assigned to the existence of greater number of charges on the polymer backbone. Optical properties of the films are studied by measuring photoluminescence spectra. This shows decrease in intensity and blue shift with the increase in zinc source concentration. The blue shift indicates strong quantum confinement. Current–voltage characteristics exhibit excellent light response indicating tunneling type of conduction.

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Acknowledgments

Authors acknowledges Department of Chemistry, Gauhati University for UV–visible and PL measurements, USIC, Gauhati University for XRD measurements, SAIF (NEHU), Shillong for TEM measurements, IACS (Kolkata) for SEM measurements. Authors also acknowledge Department of Science and Technology for providing infrastructure facility through various grants.

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  1. Department of Physics, Gauhati University, Guwahati, 781014, India

    Shyamal Kr. Dey & D. Sarkar

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  1. Shyamal Kr. Dey
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Correspondence to D. Sarkar.

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Dey, S.K., Sarkar, D. Effect of Zn source concentration on structural, optical and electrical properties of zinc sulphide–polyaniline (ZnS–PANI) nanocomposite thin films. J Mater Sci: Mater Electron 25, 5638–5645 (2014). https://doi.org/10.1007/s10854-014-2353-9

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  • DOI: https://doi.org/10.1007/s10854-014-2353-9

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