Why can nano tungsten trioxide be applied for preparing sun room thermal insulating film? According to the experts, this is because under the sunlight containing ultraviolet light and near-infrared light, the tungsten trioxide film will show a significant photochromic phenomenon. In other words, it is nano tungsten trioxide that makes the sun room thermal insulating film play a role of shielding near-infrared heat radiation and UV hazardous radiation.
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Well, do you know the photochromic mechanism of tungsten oxide film? Firstly, the experts prepared amorphous tungsten oxide thin films by the sol-gel method. And they analyzed the UV/visible spectrum of the thin films. Eventually, they discovered that the coloration was due to the formation of tungsten bronze compounds. In the process, they also measured the relationship between the optical density and the irradiation time. And they found that the photochromic mechanism of the tungsten oxide thin film is the transition of electrons between O2- to W6 +, and the charge transfer between W5 + to W6 +.
