Mo doping tungsten oxide electrochromic film can be prepared by a spray coating method. First, prepare a Mo-doped tungsten oxide nanosol, followed by preparation of a Mo-doped tungsten oxide electrochromic film.

Mo-doped tungsten oxide electrochromic film is a type of widely studied and applied electrochromic layer material, which is extremely important for producing smart windows as the color change of smart window is achieved by the change in the valence state of the electrochromic material. For example, when a negative voltage is applied to the electrochromic layer (WO3 film), the cations (H+, Li+) migrate into WO3 to change the valence state of the W atom, showing a blue color.

WO3 powder can be prepared into an electrochromic film and then be used to assemble a large area electrochromic glass. As you may have known, the reason why the color of tungsten oxide electrochromic film undergoes a reversible transition in a specific wavelength range of light is that WO3 undergoes a redox reaction under the stimulus of applying a lower voltage to it. In fact, the color change of tungsten oxide electrochromic film is mainly due to the fact that it produces a new absorption band in the spectral region.

Tungsten oxide powder can be prepared into a tungsten oxide film with high electronic conductivity, ionic conductivity, large light modulation range, high coloring efficiency and good cycle stability, and then be used as an electrochromic layer for assembling large area electrochromic glass. And these smart glasses may be applied in the buildings and automobiles for heat insulation performance.