Cs doped tungsten oxide nanoparticles such as Cs0.33WO3 nanoparticles have good NIR shielding ability and transparent heat insulating performance, so that they are mainly applied to produce car heat insulation film. Well, it has been reported that the car heat insulation film of F-doped Cs0.33WO3-xFx nanoparticles has better near infrared shielding ability than undoped Cs0.33WO3 film.

Cs doped tungsten oxide nanoparticles for building energy-saving film can be prepared by solvothermal reaction. Wherein, Cs doped tungsten oxide nanoparticles are also known as cesium tungsten bronze (CsxWO3) nanoparticles. According to the study, some experts have synthesized homogenous CsxWO3 and cesium doped molybdenum trioxide (Cs0.33MoO3) powder by solvothermal reaction using (NH4)10H2(W2O7)6, H8MoN2O4 and Cs2CO3 aqueous solution followed by annealing. And they deposited the nanocomposite films of CsxWO3 and Cs0.33MoO3 by sol-gel bar-coating method onto PET-film (thickness 186㎛) substrate.

Cs doped tungsten oxide nanoparticles are well-known as a near-infrared absorbing material. Also, CsxWO3 nanoparticles possess photocatalytic properties. According to the experts, hydrothermally synthesized CsxWO3 nanoparticles can be used to produce various types of coating films. And the coating films possess multi-functionality including near infrared (NIR) absorption and photocatalytic abilities.

Cs doped tungsten oxide nanoparticles are often applied to produce energy-saving building material, such as heat insulation coating and heat insulation film because homogeneous CsxWO3 nanoparticles have excellent NIR shielding property. According to the experts, the homogenous CsxWO3 nanorods can be synthesized by a designed water-controlled release process.