Cs doped tungsten oxide, or cesium tungsten bronze, may be applied for preparing an environmentally-friendly transparent thermal insulation paper. And the raw material powder used is a nano powder, according to experts. In addition, experts have proposed an F-doped cesium tungsten bronze, which also has excellent visible light transmission and near-infrared shielding properties, and has broad application prospects in the thermal insulation fields of building and automotive glass.
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Experts also said that the preparation of the F-doped cesium tungsten bronze mainly comprises the following steps: mix the tungstic acid solution with the fluorine source solution, add the organic acid to form the WO3-F composite sol; add the Cs2CO3 solution to the WO3-F composite sol, and the Cs-WO3-F composite sol is formed; the Cs-WO3-F composite sol is placed in an autoclave, and hydrothermally reacted at 180-200°C for 1-3 days; the reactants are sequentially centrifuged, washed with water, washed with alcohol and dried to prepare a F-doped cesium tungsten bronze powder (CsxWOyFz). The preparation method does not require high-temperature hydrogen reduction, and has simple process, low cost and low toxicity, which is favorable for large-scale production and practical application.
