Abstract: In order to promote the industrial production and widespread application of cesium-tungsten bronze(CsxWO3), CsxWO3 powders with high efficient near-infrared shielding performance were prepared by solid phase reaction method using cesium carbonate, tungsten trioxide as raw materials and using CO generated from solid oxalic acid pyrolysis as a reducing gas. The effect of reduction reaction temperature on the structure and properties of CsxWO3 particles was investigated. Based on Lambert-Beer law, a new and more reasonable transparent thermal insulation index was proposed to characterize and evaluate the near-infrared shielding performance of CsxWO3 films. The results showed that the CsxWO3-710 particles synthesized at 710 ℃ exhibited the best crystallinity, and the as-prepared CsxWO3-PVA composite film exhibited the best near-infrared shielding ability, with low haze and high transparency. Moreover, Cl-doped CsxWO3-yCly particles can be synthesized by using CsCl as cesium source at 690 ℃ and CO reduction. Cl doping is beneficial for further improving the W5+/W6+ ratio and near-infrared shielding performance. When the maximum transmittance of visible light was 70%, the near-infrared shielding rate of CsxWO3-710 and CsxWO3-yCly film samples at 1 500 nm reached 96.59% and 98.35%, and the transparent heat insulation index K attained to 4.35 and 5.20, respectively. The simulated insulation test results show that under infrared lamp irradiation, compared with blank glass, the internal temperature of the insulation box installed with CsxWO3-710 thin film and CsxWO3-yCly thin film glass can be effectively reduced by 15.5 ℃ and 17.8 ℃, respectively. Under natural sunlight irradiation, the results of continuous testing for 9 days showed that the internal temperature of the insulation box with CsxWO3-yCly thin film glass decreased by 5.1—11 ℃ compared with the blank control group.
李艺, 刘敬肖, 史非, 杨大毅, 田紫薇, 王美玉, 万佳翔, 陈超凡, 吕振杰. 基于草酸热还原制备CsxWO3用于高效近红外屏蔽薄膜研究[J]. 材料导报, 2025, 39(7): 23060135-8.
LI Yi, LIU Jingxiao, SHI Fei, YANG Dayi, TIAN Ziwei, WANG Meiyu, WAN Jiaxiang, CHEN Chaofan, LYU Zhenjie. Synthesis of CsxWO3 Particles for High Near Infrared Shielding Film by Oxalic Acid Thermal Reduction. Materials Reports, 2025, 39(7): 23060135-8.
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2025, Vol. 39 
