Nano cesium tungsten bronze for preparing office building thermal insulating film is a type of mixed valence state hexagonal tungsten bronze material, which has been successfully synthesized by solution and possesses excellent near-infrared (NIR) shielding properties. Similarly, mixed valence state tungsten suboxide (violet tungsten oxide, W18O49) also possesses excellent NIR shielding properties, and the improvement of shielding property can be successfully realized by decreasing the particle size.
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According to the experts, the NIR shielding is thought to be closely related to the free electrons and oxygen-deficiency-induced small polarons. In the case of disordered films consisting of small nanocrystals of mixed valence state tungsten oxides, small polarons are formed when excess electrons polarize their surrounding lattice and localization of the wavelength ding takes place essentially to the lattice site. It is accepted that the visible light transparence will increased daftly when particle size are far smaller than the wavelength of visible lights, because of the decreased scattering of visible light and the existence of small polarons.
