Yellow tungsten oxide has good sensitivity to detect gas, but single tungsten oxide has low sensitivity, slow response speed and poor selectivity, so it is necessary to modify the tungsten oxide materials. Doped yellow tungsten oxide with trace amount of precious metals (gold, platinum or palladium) have fast response ability of H2S gas.
In addition, yellow tungsten oxide is also a good catalyst. In order to improve the photoelectric conversion efficiency and photoelectric catalytic activity of the WO3, doping is an important method. Fe is doped to form Fe2O3 and Fe3+ can capture the photo electron, which inhibits the recombination of electron and hole. Doping can improve the efficiency of photoelectric conversion and the ability of photoelectric catalysis.