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

被引:1
作者
A Sunilkumar
S Manjunatha
T Machappa
B Chethan
Y T Ravikiran
机构
[1] Ballari Institute of Technology and Management,Department of Physics, VTURC
[2] Cambridge Institute of Technology,Department of Physics
[3] JNN College of Engineering,Department of Physics
[4] Government Science College,Department of PG Studies in Physics
来源
Bulletin of Materials Science | 2019年 / 42卷
关键词
Polypyrrole; tungsten disulphide; humidity sensor; relative humidity;
D O I
暂无
中图分类号
学科分类号
摘要
An electrically conductive polypyrrole–tungsten disulphide (PPy/WS2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\hbox {PPy/WS}}_{2}$$\end{document}) 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 PPy/WS2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\hbox {PPy/WS}}_{2}$$\end{document}-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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