Yellow tungsten oxide, more precisely, hexagonal tungsten trioxide (h-WO3), can be used to prepare a new gas sensor of high sensitivity and low power consumption. The prepared high-performance gas sensor has excellent sensitivity to toxic and harmful gases in the environment, such as CO, NOx, NH3, and H2S. Therefore, researchers have conducted extensive and in-depth research on various h-WO3 gas sensors.
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Some researchers have studied the gas-sensing mechanism of CO on the surface of h-WO3(001) from the atomic level based on the density dingal theory method. They used the Dmol3 module of the Material Studio program based on first-principles to study the gas-sensing mechanism of CO on the h-WO3 (001) surface, and found that strong physical adsorption of CO occurred on the WO-terminated (001) surface. On the O-terminated (001) surface, CO is oxidized to CO2 by the single coordination oxygen site (O1c) on the surface, and chemical adsorption occurs. Both of these adsorptions significantly reduce the surface resistance. This also indicates that the h-WO3-based sensor material can be used to detect CO gas. In other words, yellow tungsten oxide is promising in producing new gas sensors.
