The preparation of nano organic composite tungsten oxide electrochromic films can make use of nano-structured tungsten oxide films to make organic electrochromic materials better compounded with nano-tungsten oxide electrochromic materials, thereby improving the electrochromic properties of tungsten oxide electrochromic films. The preparation process is as follows:

Tungsten trioxide (WO₃) is an n-type semiconductor oxide with wide band gap. Ordered nanostructured WO₃or hydrated WO₃ has the characteristics of quantum effect and surface effect unique to nanomaterials. It has wide application prospects in gas sensing, photocatalysis, energy storage devices and other fields.

Silver-tungsten electrical contacts are widely used in various household appliances due to their good thermal conductivity, electrical wear resistance, welding resistance and oxidation resistance.

Compared with titanium dioxide, tungsten trioxide (WO₃) nano-powder can efficiently photocatalytically degrade methylene blue due to its narrow band gap, which can only absorb ultraviolet light. However, the technical problem of photocatalytic degradation of methylene blue by tungsten trioxide is to select catalysts with high catalytic activity.