Cesium tungsten oxide, also known as cesium tungsten bronze (CsxWO3), belongs to one of the tungsten bronze types and is a semiconductor material with a non-stoichiometric ratio and narrow band gap. Cesium tungsten oxide, also known as cesium tungsten bronze or cesium-doped tungsten oxide, is an inorganic compound added with cesium metal on the basis of tungsten oxide. It is a dark blue powder with a special structure of oxygen octahedron. The English name is Cesium Tungsten Bronze. The chemical formula is CsxWO3 (x is between 0 and 0.33), and the CAS number is 189619-69-0. Due to its unique crystal structure, cesium tungsten oxide has high visible light transmittance and near-infrared ray blocking rate, and has very attractive application prospects in heat insulating glass materials. However, the physical and chemical properties of cesium tungsten bronze with different crystal forms are quite different.
The study found that the structure and near-infrared absorption properties of cesium tungsten oxide (CsxWO3) powder will improve with the prolongation of reaction time and the increase of citric acid concentration in the precursor solution, and the prepared crystal structure is hexagonal tungsten bronze structure. Among them, the cesium tungsten oxide (CsxWO3) powder synthesized in the precursor solution with a citric acid concentration of 1.10mol/L, a reaction temperature of 190°C, and a reaction time of 3 days has an average minimum particle size of 185nm and is in the shape of a needle. Morphology, the specific surface area is 41.17m2/g, and the near-infrared absorption of the powder is the strongest. At 1100nm, the absorption brightness is 1.96, and the transmission spectrum of the film shows that the near-infrared shielding trend is the most obvious. The difference between the highest transmittance in the visible light region and the minimum transmittance at 1100nm in the near-infrared region is 13-18%; After that, it can be increased to 26%; the powder is heat-treated at 500°C in nitrogen for 2 hours, and then coated into a film. The difference between the highest transmittance in the visible light region of the film and the minimum transmittance at 1100nm in the near infrared can be increased to 33%. It exhibits good near-infrared shielding performance, and its thermal insulation temperature difference can reach a maximum of 21°C.
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