Cesium Tungsten Bronze Applied for Transparent Thermal Insulating Coating

Cesium tungsten bronze for preparing transparent thermal insulating coating has selective optical absorption properties in the near-infrared region, leading to the synthesis of various morphologies and new compounds including nanorods, nanowires, and nanosheets.

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The experts have attempted to clarify the near-infrared absorption characteristics of the coating film using a theoretical model that considers the localized surface plasmon resonance(LSPR)-induced absorption, scattering caused by nanoparticles, and an interlayer refractive index-induced reflection. Absorption characteristics in the near-infrared region generally originate from the LSPR 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 cesium tungsten bronze 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 internanoparticle distance must be understood.

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