Mo-doped tungsten oxide heat insulating film can be prepared by spraying. It is reported that the spraying method is a method of coating the surface of a film substrate. So, how to obtain a Mo doped tungsten oxide film by spraying? Apply the nano slurry of Mo doped tungsten oxide fine particles containing infrared absorbing material particles to the surface of the film substrate uniformly.

Tungsten oxide has excellent performance of shielding near-infrared rays and ultraviolet rays, and therefore it may be used to produce smart window film. In the hot summer, heat of the sun can easily enter the car through car window glass, and natural temperature inside the car can quickly reach 70 °C or above. In addition to the extremely uncomfortable burning sensation, it will also accelerate the aging of interior items. On rainy days, the side and rear mirrors are shrouded by rain and mist, which may affect driving safety.

Tungsten oxide has excellent optical properties, so it may be used to produce a transparent heat insulating window film with high infrared shielding performance and high visible light transmittance. The infrared shielding rate of such a heat insulation film can reach more than 95%, and the visible light transmittance can be above 80%. That is to say, building glasses applying with such thermal insulation films can achieve ideal heat insulation and heat preservation effect, thereby saving energy.

Tungsten oxide has a strong absorption capacity for electromagnetic waves so that it can be used as an excellent solar absorbing material. For example, it may be used to produce building thermal insulating glass. And the prepared glass has the properties of heat insulation and heat preservation. Also, it is waterproof, moisture proof and anti-glare. And that is because the tungsten oxide nanopowder has many properties such as good shielding performance to near infrared rays and ultraviolet rays.