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A tungsten disulphide–polypyrrole composite-based humidity sensor at room temperature

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Abstract

An electrically conductive polypyrrole–tungsten disulphide (\({\hbox {PPy/WS}}_{2}\)) composite was synthesized by a chemical polymerization technique. The composite was characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and energy dispersive X-ray spectroscopy (EDX). FESEM images showed the grainy morphology with permeable nature. XRD and FTIR characteristic peak analysis exhibited semi-crystalline behaviour and confirming the interfacial interaction of the as-synthesized composite. EDX confirmed the presence of carbon, nitrogen, oxygen, tungsten and sulphur in the composite. The humidity sensing property of the \({\hbox {PPy/WS}}_{2}\)-50% composite was tested and an approximate linear decrease in resistance was observed with an increase in relative humidity, along with a maximum sensing response of 97% and a response-recovery time of 52 and 58 s, respectively. The sensing ability of the composite was observed to be stable, when monitored for a period of two months.

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Acknowledgements

All the authors thank Dr Yashvanth Bhupal, Director, Ballari Institute of Technology and Management, Ballari, for his support. S Manjunatha thanks Sri D K Mohan, Chairman and Dr L Suresh, Principal of Cambridge Institute of Technology, Bengaluru for their encouragement.

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Authors and Affiliations

  1. Department of Physics, VTURC, Ballari Institute of Technology and Management, Ballari, 583104, India

    A Sunilkumar, S Manjunatha & T Machappa

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

    S Manjunatha

  3. Department of Physics, JNN College of Engineering, Shivamogga, 577204, India

    B Chethan

  4. Department of PG Studies in Physics, Government Science College, Chitradurga, 577501, India

    Y T Ravikiran

Authors
  1. A Sunilkumar
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  2. S Manjunatha
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  3. T Machappa
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  4. B Chethan
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  5. Y T Ravikiran
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Correspondence to T Machappa.

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Sunilkumar, A., Manjunatha, S., Machappa, T. et al. A tungsten disulphide–polypyrrole composite-based humidity sensor at room temperature. Bull Mater Sci 42, 271 (2019). https://doi.org/10.1007/s12034-019-1955-5

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