Nano Cesium Doped Tungsten Oxide Applied for Window Heat Insulation Film

Nano cesium doped tungsten oxide may be applied for preparing window heat insulation film. Among them, cesium doped tungsten oxide is a type of low-resistivity material. There are many free carriers in the system, so, there is strong free carrier absorption. Experts say that the free carrier absorption coefficient is proportional to the square of the illumination wavelength and the free carrier concentration.

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Therefore, when the wavelength of cesium doped tungsten oxide nano particles is greater than 450nm, the absorbance increases with the increasing of wavelength, and exhibits strong absorption in the short-wave near-infrared region. The prolongation of the hydrothermal reaction time contributes to the thorough reaction and complete crystal formation. And it may increase the content of cesium ions into the tungsten bronze and increase the carrier concentration in the cesium doped tungsten oxide system. With the extension of time, the absorbance in the visible light region and the short-wave near-infrared region gradually increases.

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