基于草酸热还原制备CsxWO3用于高效近红外屏蔽薄膜研究

doi:10.11896/cldb.23060135

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Abstract In order to promote the industrial production and widespread application of cesium-tungsten bronze(Cs_xWO₃), Cs_xWO₃ 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 Cs_xWO₃ 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 Cs_xWO₃ films. The results showed that the Cs_xWO₃-710 particles synthesized at 710 ℃ exhibited the best crystallinity, and the as-prepared Cs_xWO₃-PVA composite film exhibited the best near-infrared shielding ability, with low haze and high transparency. Moreover, Cl-doped Cs_xWO_3-yCl_y 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 Cs_xWO₃-710 and Cs_xWO_3-yCl_y 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 Cs_xWO₃-710 thin film and Cs_xWO_3-yCl_y 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 Cs_xWO_3-yCl_y thin film glass decreased by 5.1—11 ℃ compared with the blank control group.

Key words： cesium tungsten bronze solid-phase synthesis near infrared shielding energy-saving window CO reduction transparent thermal insulation index

Published: 10 April 2025 Online: 2025-04-10

CLC number:

TQ136.1

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	Articles by authors
	LI Yi
	LIU Jingxiao
	SHI Fei
	YANG Dayi
	TIAN Ziwei
	WANG Meiyu
	WAN Jiaxiang
	CHEN Chaofan
	LYU Zhenjie

Cite this article:

LI Yi,LIU Jingxiao,SHI Fei, et al. Synthesis of Cs_xWO₃ Particles for High Near Infrared Shielding Film by Oxalic Acid Thermal Reduction[J]. Materials Reports, 2025, 39(7): 23060135-8.

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https://www.mater-rep.com/EN/10.11896/cldb.23060135 OR https://www.mater-rep.com/EN/Y2025/V39/I7/23060135

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