Cs doped tungsten oxide nanoparticles may be used to prepare thermal insulation dispersion with excellent near infrared absorbing ability. Wherein, Cs doped tungsten oxide nanoparticles can be synthesized by using sodium tungstate and cesium carbonate as raw materials, and citric acid as a reducing agent under hydrothermal conditions. The obtained nanoparticles are Cs0.32WO3 nano powders with a hexagonal phase structure, which exhibit strong near-infrared absorption performance in the near-infrared region, and the highest absorbance at the wavelength of 1100nm can reach 1.96.
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In this regard, the experts said that the reaction system needs to provide a certain reducing atmosphere. The reason is that the valence state of tungsten in sodium tungstate is hexavalent, and the valence state of tungsten in CsxWO3 should be lower than hexavalent. Therefore, CsxWO3 must be synthesized in a certain reducing atmosphere. Citric acid contains three carboxylic acid groups and one hydroxyl group. In a hydrothermal environment, its carboxylic acid groups and hydroxyl groups can be oxidized to acyl or carbon dioxide, which has strong reducing ability.
