Some experts have carried out heat treatment on the Cs0.33WO3 nanoparticles for window heat insulation film in a nitrogen atmosphere at different temperatures for 2h. And they used the prepared powders to produce films. Then, they observed the visible-near-infrared light shielding properties of the obtained film.
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From the transmittance spectra of Cs0.33WO3 films prepared before and after N2 atmosphere annealing at different temperature for 2h, experts said that the overall transmittance of the prepared film in the visible light region and near-infrared region is obvious as the heat treatment temperature increases. When the temperature reaches 900°C, the film has no shielding performance in the near-infrared region, but after 500°C nitrogen heat treatment, the visible light transmittance of the Cs0.33WO3 powder improves while ensuring high shielding rate in the near-infrared region. And the high near-infrared shielding rate guarantees good thermal insulation properties, so the film has excellent thermal insulation properties. The above-mentioned Cs0.33WO3 is cesium tungsten bronze.
