Recent Research Trend in WO3-based Gas Sensors for Enhancing Sensing Properties

Abstract

Semiconducting Metal Oxide (SMO) gas sensors have attracted considerable attention to analyze gases in exhaled breath and monitor air quality. This paper reports a recent research trend for enhancing sensing properties of WO 3 (tungsten oxide), a representative n-type gas sensing material. Firstly, the operating principle of WO 3 based gas sensors is explained. Secondly, various nanostructures of WO 3 from zerodimensional to three-dimensional are reviewed. Thirdly, doping and decoration as effective strategies to enhance gas sensing properties are introduced. We summarize recent progress and provide an insight for enhancing gas sensing properties of WO 3 based gas sensors.