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 dingal 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.
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However, the main issue concerning CsxWO3 polymer films is the detrimental photochromic effect under strong ultraviolet irradiation, which hampers their extensive application in energy-efficient windows, such as in automobiles and architecture. Herein, the photochromic effect is largely relieved by embedding CsxWO3 nanoparticles into inert PET instead of mixing with resins like polyurethane or acrylic resin, and the final organic-inorganic films exhibit almost no coloration under strong UV illumination. In a word, it provides a new insight into making hybrid films with high stability, transparency and multi-dingality in the optical fields.
