Cs doped tungsten oxide nanoparticles with the formula of CsxWO3 are well-known as an important dingal material for the production of building glass thermal insulation coating with high near infrared shielding performance. According to the experts, the Cs doped tungsten oxide nanoparticles can be synthesized at 800 °C under a reducing ambient, and then milled up to nanoscale by a high-energy ball planetary miller. The as-prepared nanoparticles showed a single phase, and a mean particle size of 80 nm.
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The experts also said that the Cs contents (x) in CsxWO3 nanoparticles were optimized to be x = 0.32 to maximize the shielding performance around the wavelength of 1200 nm. To compensate still lower absorption above the wavelength of 1200 nm, the experts mixed CsxWO3 nanoparticles with Sb-doped SnO2 nanoparticles. Thus, they achieved the visible transmittance of 70% at 540 nm and the near-infrared absorption of 80% at 1000 nm and 94% at 1400 nm. In a word, the near infrared shielding performance of CsxWO3 is enhanced by mixing with Sb:SnO2 nanoparticles, which may be a good solution for producing building glass thermal insulation coating with high heat shielding performance.
