Cs doped tungsten bronze may be prepared into a near infrared light shielding film, which contains fine particles for absorbing infrared light. You know, windows of buildings and vehicles have been constituted with transparent glass plates or resin plates so that sunlight can be transmitted. However, the sunlight contains ultraviolet light and near infrared light in addition to visible light. Near infrared light having wavelengths of 780 to 2,100 nm is called heat rays and causes elevation of the temperature at the inside when the light is transmitted through the windows of buildings and vehicles.

CsxWO3, or cesium tungsten bronze, can be used to produce a new environmentally friendly near infrared light shielding film. According to the experts, with the promotion of CsxWO3 in the application of heat insulation, the preparation of cesium tungsten bronze has received more and more attention. Well, how to prepare cesium tungsten bronze nanoparticles?

Cesium tungsten bronze such as Cs0.33WO3 nano particles may be used to prepare a smart film to effectively shield near-infrared heat radiation and adjust the visible light transmittance. It has been reported that this new type of smart film has a wide range of applications in the field of building energy saving because it can selectively regulate (shield) the energy of sunlight.

Cesium tungsten bronze, such as Cs0.33WO3, is the most important functional material for producing near infrared light shielding film. And such a transparent thin film is advantageously used for attaching to window panes of buildings and windshield glasses of automobiles and, in particular, to windshield glasses of automobiles, because the Cs0.33WO3 nano particles can shield most of the heat rays (near infrared light having wavelengths of 780 to 2,100 nm) that causes elevation of the temperature at the inside when the light is transmitted through the open portions.