Cs doped tungsten oxide nanoparticles for producing thermal insulating coating may be Cs0.33WO3 nano particles with excellent performance of shielding near-infrared radiation in the sunlight by absorption. According to the experts, they have synthesized the homogeneous cesium tungsten bronze nanoparticles by using traditional solid state reaction method with changing reaction condition and investigated the heat-shielding properties of the coating films.
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It was found that only the Cs0.33WO3 nanoparticles mainly has the hexagonal tungsten bronze structure by annealing at 800 °C, size of CsxWO3 observed as being 30-100 nm. And the Cs0.33WO3 nanoparticles observed at the 75 nm were aggregated with the mass of the few micron size. All synthesized nanoparticles exhibited the properties of NIR shielding. Particularly, the Cs doped tungsten oxide nanoparticles synthesized by the annealing at 800 °C showed a pronounced absorption of NIR light transmittance. Due to thermographic analysis of IR light, the Cs0.33WO3 film formed on the glass substrate by coating the as-prepared thermal insulating coating shields the NIR radiation mainly by absorption.
