Nano cesium doped tungsten oxide may be used to prepare near infrared shielding material, such as, thermal insulation film. According to experts, the thermal insulation film has a high transmittance in the visible region, a low transmittance in the ultraviolet region and the short-wave near-infrared region. In other words, the heat insulation material of cesium doped tungsten oxide nano particles exhibits a good tendency of ultraviolet shielding and near-infrared shielding properties.
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Experts also said that after UV irradiation, the near-infrared shielding trend of the heat insulation thin film is further obvious, showing more excellent near-infrared shielding performance. In addition, after the thin film is irradiated with ultraviolet light, the color is deepened, indicating that the thermal insulation film of doped tungsten oxide has photochromic phenomenon. And the absorption edge of the transmission spectrum of such film moves in the short-wave direction. And therefore, such material of cesium doped tungsten oxide nano particles will have a good potential in heat insulation field.
