Cs0.32WO3 is often prepared into a heat insulation window film, which is environmentally friendly with excellent near-infrared shielding performance and high transparency. Cs0.32WO3 is also known as cesium tungsten bronze (CsxWO3). According to the experts, the CsxWO3 heat insulation window films can be grown on glass substrates by electron beam evaporation with using the CsxWO3 powders prepared by the low-reaction temperature method, which can produce mass amount of hexagonal CsxWO3 powders more easily.
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The as-deposited thin films are amorphous and that transform into hexagonal CsxWO3 with some cubic phase peaks after annealing under N2 atmosphere. With the gas changing into H2, the phase changes into hexagonal CsxWO3. The result shows that the hexagonal thin films have better visible transmittance and near-infrared shielding properties than the cubic phase. In addition, with the annealing temperature increasing, the ability of NIR shielding is more desirable. Under the condition of 500?°C and H2, annealed CsxWO3 has the highest transmittance of 80% in the visible light region and the lowest transmittance of 42% in the NIR region.
