As a heat shielding material, Cs doped tungsten oxide nanoparticles are well known as cesium tungsten bronze nanoparticles, with the formula of CsxWO3. Due to the excellent near-infrared (NIR) shielding properties, Cs doped tungsten oxide nanoparticles are more and more popular in the study of heat insulation products for applying to glasses of buildings and autos. While the color of CsxWO3 nano powder changes under UV irradiation due to photochromic instability, which hinders its commercial applications. Then, how to solve the color change of cesium tungsten bronze?

Cs doped tungsten oxide nanoparticles for producing energy-efficient window can be synthesized by a simple thermal reduction method, and then further dispersed by bead milling to obtain the nano dispersion liquid of CsxWO3 nanoparticles. The nano dispersion liquid can be employed to make a unique functional film with 70% visible light transmittance and a near infrared transmittance less than 10%, while maintaining a high transparency with less than 1.0% haze.

Cs doped tungsten oxide nanoparticles for producing heat insulating glass may be Cs0.32WO3 nanoparticles with excellent NIR shielding properties. Wherein, the Cs doped tungsten oxide nanoparticles are often prepared into heat insulation film at first. And then the Cs0.32WO3 film is used for covering on an ordinary sheet of glass to obtain heat insulating glass.

Cs doped tungsten oxide nanoparticles such as Cs0.33WO3 nanoparticles are usually applied to produce highly transparent heat insulation products as a near-infrared absorber. It has been reported that the optical and dielectric properties of Cs0.33WO3 bulk crystal and nanoparticles can be investigated by high energy-resolution electron energy-loss spectroscopy (HR-EELS).