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.
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According to the study, the experts synthesized F-doped Cs0.33WO3-xFx particles by hydrothermal method with HF as fluorine source, and prepared heat insulating films from dispersion of Cs0.33WO3-xFx nanoparticles in PVA aqueous solution. And they also investigated the effects of F doping on the crystal structure and morphology of Cs0.33WO3-xFx particles as well as the NIR shielding ability and heat insulation properties of Cs0.33WO3-xFx films. The results indicated that HF addition could promote the formation of rod-like Cs0.33WO3-xFx particles and increase the yield of Cs0.33WO3-xFx powders. Moreover, the as-prepared films from Cs0.33WO3-xFx dispersion solution exhibited higher NIR shielding ability and heat insulating properties than that of the undoped Cs0.33WO3 film. Particularly, the as-prepared Cs0.33WO3-xFx sample with F/W (molar ratio)=0.45 showed best NIR shielding ability and transparent heat insulating performance.
