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Title of Journal: Int J Miner Metall Mater

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Abbravation: International Journal of Minerals, Metallurgy, and Materials

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University of Science and Technology Beijing

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DOI

10.1007/s12613-012-0683-2

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ISSN

1869-103X

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Simple point contact WOSubscript3/Subscript se

Authors: Wubin Gao Yunhan Ling Xu Liu Jialin Sun
Publish Date: 2012/12/09
Volume: 19, Issue: 12, Pages: 1142-1148
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Abstract

A simple and new point contact tungsten trioxide WO3 sensor which can be prepared by the oxidation of tungsten filaments via insitu induction heating likely detects low concentration ppm level environmental pollutants such as NO2 Xray diffraction XRD and field emission scanning electron microscopy FESEM were applied to characterize the phase and the microstructure of the samples respectively It was found that the synthesized WO3 films exhibited a monoclinic phase and were composed of hierarchical microcrystals and nanocrystals The point contact WO3 sensor WWO3W showed rectifying characteristics and an ideal sensing performance of about 110°C A single semicircle in Nyquist plots was recorded by electrochemical impedance spectroscopy EIS at a relatively low temperature of 150°C but faded away above 200°C which revealed that the sensing process was governed by a determining factor ie grain boundaries at the contact site

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