Cs Doped Tungsten Oxide Nanoparticles Applied for Transparent Thermal Insulation Material

Cs doped tungsten oxide nanoparticles are often applied to produce transparent thermal insulation material such heat insulation film and heat insulation coating as the absorbance of such a functional material is high in the near-infrared region, and the absorbance increases with the increase of the wavelength in the visible and near-infrared regions. But why does the absorbance of cesium tungsten bronze increase with the increase of wavelength in the visible and near infrared regions?

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According to the experts, the near-infrared absorption of materials is related to the free carrier concentration in the material system. And the absorption coefficient of free carriers is proportional to the square of the wavelength and the carrier concentration. Transparent thermal insulation material of Cs doped tungsten oxide nanoparticles has high absorbance in the near-infrared region because cesium-doped tungsten oxide nanoparticles are doped semiconductor materials and low-resistivity materials with high free carrier concentration in the system. In addition, the forbidden band width is another important factor affecting the near-infrared shielding performance of cesium tungsten bronze.

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