High purity yellow tungsten oxide nanopowder, also called high purity tungsten trioxide nanopowder, can be applied as a semiconductor gas sensor.
Tungsten trioxide (WO3) is an n-type transition metal semiconductor that has been considered as one of the most promising new oxide gas sensing materials for detecting NOx, SOx, NH3, CO, hydrogen (H2) and hydrogen sulfide (H2S) and other gases. The principle of WO3 gas sensitive material is that when it is exposed to the specific gas, oxygen is adsorbed from the air as an electron acceptor state in the band gap material of tungsten trioxide, surface reaction leading to the acceptor state on some parts of surface coverage changes, causing the change of electrical conductivity, thus to realize the detection of specific gas concentration.
There are many fruits about research of tungsten trioxide gas sensor, such as WO3 thin film gas sensor, WO3 hydrogen optical fiber sensor, porous silicon substrate WO3 nano-thin film gas sensor, tungsten trioxide nanowire CO gas sensor, and so on.
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