Gas-sensing Material: WO3

WO3, an n-type semiconductor, is an excellent gas-sensing material and has good sensitivity to toxic gases such as NO2. According to the experts, in recent years, with the rapid development of economy and industry, toxic gases such as NO2 have caused serious environmental pollution problems, such as acid rain, photochemical smog, etc. Due to their toxicity and destructiveness, the detection of NO2 and other toxic gases has paid much attention.

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Therefore, a sensitive and reliable NO2 gas sensor with low detection limit and low power consumption is much needed. Among metal oxide semiconductors, WO3 is considered to be the most promising gas-sensing material for detecting NO2. While some scholars believe that the sensitivity of WO3 nanomaterials could be improved, working temperature could be reduced, especially selectivity and stability could be enhanced. Also, it is also necessary to overcome the high cost of preparation and explore a simple and reproducible preparation process so that it can be applied to commercial production earlier.

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