Doping Tungsten Trioxide Thin Film Property

Tungsten trioxide thin film will significantly improve certain properties, such as sensitivity and selectivity. Tungsten trioxide thin film doped with the metal ions can be incorporated or can be sputtered rare metals, such as palladium (Pd), platinum (Pt), gold (Au), silver (Ag), lithium (Li) and the like. Metal ions are in the form of he corresponding metal salt is added, such as LiN0₃, RbCl, CsCl, Bi (N0₃) ₃, AgN0₃.

Sensing property will be significantly different with the incorporation of different metal ions additives. After doping palladium or platinum to hydrogen sensitivity, tungsten trioxide thin film electrochromic performance is greatly improved, especially the speed time and fade time are improved. Silver-doped tungsten trioxide thin film gas sensitivity can be increased. Tungsten thin film as hydrogen-sensitive element in the test shows that the addition of palladium or platinum can improve the sensitivity of the thin film with the hydrogen and palladium or platinum, which can shorten the response time.

The 1.0% Ag-doped tungsten trioxide thin film effectively improve the sulfur dioxide (SO₂) sensitivity and selectivity at 450 ℃. Research shows that 15% Li-doped tungsten trioxide thin film is similar to the not doped tungsten trioxide thin film, but thin film doped coloration and its fade time is long. The Au-doped tungsten trioxide thin film improves the selectivity of NH₃.

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