Cs0.33WO3-xFx, which is known as an important near-infrared shielding material, may be prepared by the gel-gel method. For example, some experts have prepared Cs and F co-doped Cs0.33WO3-xFx by sol-gel method with using tungstic acid, CsCl, and CsF as raw materials (Cs/W = 0.33), and discussed the effects of different F doping amounts on product phase, morphology, and optical properties.
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The results showed that with the increase of the F doping amount, the diffraction peak of the product broadens significantly, and the product gradually changes from nanorods (about 30-50 nm in diameter and 20-hundreds of nanometers in length) to nanoparticles (about 10 nm in diameter). When F/W = 0.22, Cs0.33WO3-xFx exhibits the best near-infrared shielding performance. Tvis-max (the maximum visible light transmittance) = 76.3%, T950 nm (the transmittance at 950 nm) = 25.7%, TNIR-min (the minimum near infrared transmittance) = 10.5%.
