XIE Ji, XIE Zhenfang, HU Xiaobing, WU Yihua, ZHU Zhigang
(School of Environmental and Materials Engineering, College of Engineering, Shanghai Second Polytechnic University,
Shanghai 201209, China)

Abstract: As a kind of N-type semiconductor material, WO₃ showed good gas sensitivity. Recently, many studies have been researched on the detection of NO₂, and the researchers consider that the WO₃ has great application potential for NO₂ detection. In this paper, the gas sensing mechanism of N-type semiconductor WO₃ nano-material was first introduced, and then the research progress on enhancing the gas sensing performance in terms of morphology controlling, doping and forming the compounds was summarized.
Key words: nano materials, gas sensor, WO₃, NO₂