Cs doped tungsten oxide may be applied for producing transparent thermal insulation material, which is more and more widely used in building glass. Therefore, experts are also paid much attention to such material. They proposed a preparation method of cesium doped tungsten oxide nano powder, the specific process is as follows:
Adopt sodium tungstate as raw material to prepare a certain concentration of sodium tungstate solution. Prepare the tungstic acid sol by cation resin exchange. And then an appropriate amount of citric acid solution, ethanol and a certain concentration of cesium carbonate solution are added in the tungstic acid sol. The mixture is uniformly stirred to obtain a precursor liquid of hydrothermal reaction. And the precursor solution with citric acid concentration of 0.36, 0.55, 0.73moL/L and ethanol volume percentage of 56% and citric acid concentration of 0.55moL/L was prepared separately. And then the precursor liquid is placed in the autoclave at 190°C. The reaction is carried out for 1-5 days, and the obtained precipitate is subjected to ultrasonic water washing, alcohol washing, centrifugation and drying treatment to obtain pure cesium doped tungsten oxide powder.
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Experts analyzed the results and found that the nano cesium doped tungsten oxide powder synthesized at higher concentration of citric acid has higher absorbance in the short-wave near-infrared region. It could be that the increase of citric acid concentration improves the reduction of precursor liquid, and the reactivity is improved, so that more cesium ions enter the tungsten bronze structure, and the carriers in the system increase.
