3D quasi-vertical WO3•0.33H2O nanosheet film can be prepared by electrodeposition method, that is, the hydrated tungsten trioxide nanosheet prepared by a simple green solution method is formed on the conductive substrate, which can solve the limitation of the hydrothermal method on the film substrate.

The discoloration mechanism of the crystalline tungsten oxide thin film conforms to the Drude-like free electron scattering model. And the free electrons play an important role in the optical properties of the electrochromic performance of the crystalline tungsten oxide film.

Crystalline tungsten oxide film can be prepared by a reactive magnetron sputtering method under different oxygen partial pressures. The experts analyzed the surface morphology and the density of the WO3 thin films under different oxygen partial pressures, and studied the effects of surface morphology and porosity on the electrochromic properties.

Ti-doped yellow tungsten oxide thin film has the same electrochromic properties as the tungsten trioxide thin film. Experts say that at present, the research on the electrochromic properties of Ti-doped tungsten trioxide film is mostly concentrated in chemical preparation methods, such as sol-gel method and hydrothermal method. And there are few reports on the preparation of Ti-doped WO3 thin film by reactive magnetron sputtering method.