Tungsten oxide thin film is promising in application of smart window as it has good electrochromic properties. Therefore, the synthesis of tungsten oxide thin film has been attracting more and more attention. It has been reported that sol-gel technology for deposition of WO3 electrochromic films has gained enough impetus over the past decade owing to its low cost and adaptability to large-area deposition.

Tungsten trioxide is an important material for obtaining an electrochromic film. And the prepared electrochromic film is promising for smart window applications. Therefore, the preparation of WO3 film attracted much attention. According to the experts, there are various conventional deposition methods for fabricating WO3 film, including direct current, radio frequency, magnetron sputtering, sol–gel methods, plasma spraying method, electron beam evaporation, thermal evaporation, and hydrothermal methods.

Mo-doped tungsten bronze nanorods are well-known as an electrochromic material with selective absorption of light, so they are often used to prepare electrochromic film. Then, how to prepare such a thin film?

Tungsten oxide is often used to prepare a new type of energy saving coating because of its excellent optical properties. The obtained transparent heat-insulating coating is environmentally-friendly, safe, and non-toxic.

Tungsten oxide for preparing water-based glass thermal insulation coating is selected from high-purity tungsten oxide nano powder - a new type of nano heat insulation medium. Some experts have developed robust super hydrophobic tungsten oxide coating with a water contact angle of 155° for photochromism via a facile and substrate-independent route.

Tungsten oxide for producing hotel lobby heat insulation coating is often adopting tungsten oxide nano particles with high heat insulation and high visible light transmission. It is reported that such transparent heat insulation glass coating meets the requirements of relevant industry standards. Also, it meets the three major conditions of advanced energy efficiency levels, good energy saving economics, and significant social benefits.

Lithium-doped tungsten oxide can be used to fabricate electrochromic device in the form of a thin film with better coloration and electrochromic properties than undoped tungsten oxide. According to the researchers, the electrochromic films can be prepared by electron beam evaporation on ITO glasses under the parameters of room temperature, with thicknesses of about 530 nm. Wherein, xLi2O-(1−x)WO3 powders were mixed with WO3 and Li2O and pressed into target pellets.

Tungsten oxide coating is well-known as a popular heat insulation coating because of the optical properties of tungsten oxide – high shielding performance to near infrared light and ultraviolet light and high transmittance to visible light. So, the production of tungsten oxide coating has been attracting much attention. It has been reported that tungsten oxide coating can be prepared via a sol-gel type process from tungstic chloride and tungstic acid precursors. Wherein, various combinations of ethanediol and block co-polymers are used as stabilizing additives to achieve microstructural control.

Tungsten oxide has good electro-optical properties to exhibit good electrochromic behavior so that it is used to manufacture electrochromic coating. Well, do you know how to gain the optical indices of tungsten oxide electrochromic coating?

Amorphous tungsten oxide may be applied to fabricate heat insulation film for applications of window glasses and glass curtain walls of buildings, and windshield windows of autos. Some experts have deposited the amorphous tungsten oxide film by pulsed laser deposition. And they investigated the correlation between morphology, composition, and the mechanical properties of metallic amorphous tungsten-oxygen and heat insulation film of amorphous tungsten oxide by the combined use of Brillouin spectroscopy and the substrate curvature method.