Bulletin of Materials Science

, 42:271 | Cite as

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

  • A Sunilkumar
  • S Manjunatha
  • T MachappaEmail author
  • B Chethan
  • Y T Ravikiran


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.


Polypyrrole tungsten disulphide humidity sensor relative humidity 



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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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • A Sunilkumar
    • 1
  • S Manjunatha
    • 1
    • 2
  • T Machappa
    • 1
    Email author
  • B Chethan
    • 3
  • Y T Ravikiran
    • 4
  1. 1.Department of Physics, VTURCBallari Institute of Technology and ManagementBallariIndia
  2. 2.Department of PhysicsCambridge Institute of TechnologyBengaluruIndia
  3. 3.Department of PhysicsJNN College of EngineeringShivamoggaIndia
  4. 4.Department of PG Studies in PhysicsGovernment Science CollegeChitradurgaIndia

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