Invertis Journal of Science & Technology

  • Year: 2019
  • Volume: 12
  • Issue: 4

Investigations on the Enhanced Gas Sensing Character of WO3/Bi2S3 Heterogeneous Nano Composite at Nearby Room Temperature

1Department of Mechanical Engineering, National Institute of Technology, Surathakal, Karnataka, India

2Department of Mechanical Engineering, Vellore Polytechnic College, Vellore, Tamil Nadu, India

3Department of Metallurgical and Materials Engineering, IIT Roorkee, Roorkee, Uttarakhand, India

*Corresponding author email id: yathavan26@gmail.com

Online published on 6 February, 2020.

Abstract

Metal oxide based nanocomposites of WO3-Bi2S3 has been synthesized using hydrothermal method for the first time. The nanocomposite powders were characterized by powder X-Ray diffraction to confirm the existence of mixed crystallographic phases. EDX analysis on nanocomposites estimates the composition of individual element present in WO3-Bi2S3matrix. The induced strain upon loading Bi2S3 in WO3 matrix has been computed with the aid of Williamson-Hall plot. Surface morphologies of nanocomposite powders has been studied using FESEM images. The observed changes in the band gap energies of nanocomposite powders due to the inclusion of Bi2S3 has been ascertained fromthe tauc plots. Finally, the gas sensing activity characteristics of WO3, Bi2S3 and the nanocomposite powders of WO3-Bi2S3have also been studied. The overall results obtained has been discussed in detail.

Keywords

Gas sensing activity, Nanocomposites, Nano materials, Semiconductor