It has been reported that some researchers prepared electrochromic tungsten trioxide film by spray pyrolysis under various conditions using tungsten chloride (WCl6) to dissolve in 50% ethanol–50% water. And it was found that all the as-deposited electrochromic tungsten trioxide films were amorphous and dark. When annealed, they became crystallized and transparent. In the preparation process, the researchers also studied the structure and the composition of these films, before and after annealing.

Some experts have proposed a preparation method of inorganic all-solid WO3 electrochromic device. Wherein, the inorganic all-solid electrochromic device has a nickel oxide-zirconia-tungsten oxide stacked structure, and silver nanowires are spin-coated on the stacked structure.

Recently, tungsten-oxide-based material has received considerable attention among various photothermal nanomaterials because of its ability to absorb near-infrared light and its efficient light-to-heat conversion properties. In addition, tungsten-oxide-based material has an unusual oxygen defect structure and strong surface plasma resonance, which offers strong photoabsorption in a broad wavelength range of the near-infrared light region.

Tungsten oxide is an idea material for NO2 sensing. It has been reported that tungsten oxide based gas sensors exhibit excellent NO2 sensing properties to cover environmental standard of NO2. The experts have done researches to investigate several properties of nano crystallites of tungsten oxide including NO2 sensing characteristics.