As a heat shielding material, Cs doped tungsten oxide nanoparticles are well known as cesium tungsten bronze nanoparticles, with the formula of CsxWO3. Due to the excellent near-infrared (NIR) shielding properties, Cs doped tungsten oxide nanoparticles are more and more popular in the study of heat insulation products for applying to glasses of buildings and autos. While the color of CsxWO3 nano powder changes under UV irradiation due to photochromic instability, which hinders its commercial applications. Then, how to solve the color change of cesium tungsten bronze?
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It is reported that spray pyrolysis is adopted to solve the color change of Cs doped tungsten oxide nanoparticles under UV irradiation. According to the experts, the Cs0.32WO3 nanoparticles prepared by spray pyrolysis exhibited an improved photochromic stability under UV irradiation compared to those synthesized through a solid state reaction. Detailed analysis using atomic resolution transmission electron microscopy revealed that the Cs0.32WO3 nanoparticles of spray pyrolysis route retain Cs ions up to a depth of less than 1 nm from the surface. Also, it is suggested that the less-Cs-deficient Cs0.32WO3 nanoparticles are beneficial to improve the photochromic stability.
