Cesium tungsten bronze for near infrared shielding material can be prepared via a simple thermal decomposition process involving the combination of ammonium metatungstate with oleylamine as both the surfactant and the solvent.
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According to the experts, the prepared cesium tungsten bronze capped with oleylamine had an average diameter of about 30 nm and exhibited a shielding property of approximately 80% of near-infrared radiation across a wavelength range of 780–2100 nm, while transmitting 70% of visible light upon dispersion in a non-polar solvent of toluene. In this process, cesium ions could successfully be intercalated into the framework of the cubic pyrochlore structure of tungsten oxide at a relatively low reaction temperature and within a short time, generating the cesium tungsten bronze nanoparticles. And the near infrared absorption properties upon the CsxWO3 that are superior to those of ATO and ITO nanoparticles in terms of absorption range and intensity, suggesting a significantly advanced solution process capable of producing useful near infrared absorbents.
