Cesium Doped Tungsten Oxide Nanopowder Applied for Transparent Thermal Insulation Material

A preparation method of cesium doped tungsten oxide nanopowder for transparent thermal insulation material, including the following steps:

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1.0 The reaction amount of the raw material ammonium tungstate and cesium nitrate is dissolved in absolute ethanol, respectively. And the ammonium tungstate solution is configured into a tungstic acid solution by exchanging resin;

2.0 The reaction solvent was prepared by dissolving citric acid in absolute ethanol. The mass of the reaction solvent is twice the sum of the mass of tungsten salt and cesium salt. The tungstic acid solution, the cesium nitrate solution and the reaction solvent are mixed. And the mixture is stirred under a water bath of 50°C for 1.5h to obtain a hydrothermal reaction precursor liquid;

3.0 The precursor liquid is placed in a closed hydrothermal reaction kettle with a stirring device. And the reaction is performed at 180°C for 12h;

4.0 The hydrothermal reaction precipitate was repeatedly washed with deionized water, dried at 80°C for 8h, and then pulverized by a jet mill. The air pressure in the crushing chamber was controlled at 0.5MPa, and the pulverizing speed was set at 3000r/min, finally, the powder was heated to 500°C at a rate of 5°C/min in an argon atmosphere. And heat treatment was continued for 1.5h to obtain cesium doped tungsten oxide nano powder. The obtained cesium doped tungsten oxide nano powder has good stability. And the ultraviolet blocking rate is 99.8%, visible light transmittance is 80%, and the infrared ray blocking rate is 94%.

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