Cs0.33WO3 Applied for Window Thermal-insulation Film

Cs0.33WO3 for producing window thermal-insulation film is known as cesium tungsten bronze with excellent near-infrared absorption properties. And it is often nano particle size cesium tungsten bronze. According to the experts, they have attempted to clarify the near-infrared absorption characteristics of the heat insulation film using a theoretical model that considers the localized surface plasmon resonance-induced absorption, scattering caused by nanoparticles, and an interlayer refractive index-induced reflection.

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The experts also introduced that absorption characteristics in the near-infrared region generally originate from the localized surface plasmon resonance and can be predicted using the Mie-Gans theory with the following factors proving influential: the aspect ratio, the electron deficiency of the cesium tungsten bronze according to nonstoichiometric compositions, and the purity of the tungsten bronze cesium as determined by the annealing condition. Although these parameters are well defined, they focus on rather qualitative aspects confined to the material itself. The optical characteristics based on quantitative data such as the number of nanoparticles, the interference of the medium, and the inter nanoparticle distance must be understood.

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