WO3 nanopowder is a typical n-type gas-sensing material that has high sensitivity and selectivity to toxic gases, so it has a wide application in gas sensor to detect various hazardous gases. Especially for trimethylamine gas, the reaction is rapid, and the sensitivity is very high. It means that the WO3-based gas sensor provides a quick, convenient, and accurate detection method for detecting whether fish or shellfish food has deteriorated. Also, the gas sensor based on WO3 nano particles has the advantages of low power consumption, low cost and convenient operation. So, WO3 has attracted much attention.

WO3 film, an n-type semiconductor, is used as an excellent thin film gas-sensing element in applications of gas sensors. You know, WO3 is a typical n-type gas sensing material that has attracted considerable attention to detect various hazardous gases, in the form of nano particles or thin films.

As a semiconductor gas sensing film material, WO3 film has good sensitivity to NOx, H2S, H2, CH4, C2H5OH, CO, NH3 and other gases, so it has broad application prospects. Therefore, the preparation of WO3 film has been paid much attention. Here is a preparation method of WO3 film.

As a gas sensing material, WO3 on the nanoscale has good gas sensitivity and selectivity towards H2, CO, H2S, NH3, NOx, O3 as well as some organic gases. WO3 nano powder is a typical n-type semiconductor that is considered to be the promising material to fabricate the gas sensor, which has a widespread utilization in the environment detecting and the safety monitoring. When WO3 nanopowder contacts the gas to be measured, its resistance changes, so that the output signal changes accordingly to achieve the purpose of gas detection.