Violet Tungsten Oxide Nanoparticles Applied for Transparent Heat Insulation Glass Coating

Violet tungsten oxide nanoparticles have unique photochromic properties - absorption of near infrared rays, shielding of ultraviolet rays, and transmission of visible light. Therefore, violet tungsten oxide nano powder has been more and more widely used in the production of transparent heat insulation glass coating for applying to building glass.

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It is well known that tungsten is a transition metal element. Among the tungsten oxides, the most common one is tungsten trioxide, also known as WO3 or yellow tungsten oxide. The tungsten trioxide is a semiconductor material with excellent properties such as high sensitivity. The crystal unit of tungsten trioxide is a regular octahedron, and the crystal form is divided into a monoclinic crystal, a tetragonal crystal, a cubic crystal, and the like. In the actual preparation process, other than WO2.72 (W18O49, violet tungsten oxide), there are some other non-oxygen vacancies stoichiometric tungsten oxides (WO3-X), such as WO2.90 (W20O58, blue tungsten oxide), WO2.83 (W24O68), and WO2.80 (W5O14), etc.

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