Cs Doped Tungsten Oxide Nanoparticles Applied for Thermal Insulation Film

You know, Cs doped tungsten oxide nanoparticles or cesium tungsten bronze (CsxWO3) nanoparticles with excellent near-infrared shielding performance are important for preparing thermal insulation film. Well, do you know the effects of annealing in different atmosphere on the near-infrared shielding properties of Cs doped tungsten oxide nanoparticles under low temperature hydrothermal reaction?

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Some experts have synthesized CsxWO3 powders by low temperature hydrothermal reaction using sodium tungstate and cesium carbonate as raw materials, with citric acid as the reducing agent. They investigated the effects of annealing in different atmosphere on the near-infrared shielding properties of CsxWO3, and characterized the microstructure of CsxWO3 powders by X-ray diffraction. Also, they prepared CsxWO3 films on glass using polyvinyl alcohol solution as film-forming agent, and investigated the optical transmission properties of CsxWO3 thermal insulation films.

The results indicate that the near-infrared shielding ability of samples after annealed at 200°C in the air atmosphere did not deteriorate apparently, but the 400°C-annealed samples in the air atmosphere showed apparent decrease of near-infrared shielding properties. Annealing in the carbon powder atmosphere had no apparent effects on the properties of CsxWO3 particles. As for the N2 annealing, the 500°C-annealed samples showed best improved near-infrared shielding as well as high transparency in the visible light region.

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