Cesium tungsten bronze nanopowder for bathroom thermal insulating film can be synthesized by the traditional solid state reaction method. For example, some experts prepared the homogeneous cesium tungsten bronze nanoparticles by this method with changing reaction condition and investigated the heat-shielding properties of their films.
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The experts 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 ≤ 150 nm. In the other hand, the Cs0.33WO3 nanoparticle observed at the 75 nm and was aggregated with the mass of the few micron size. All synthesized nanoparticles exhibited the properties of NIR shielding. Particularly, the nanoparticle of Cs0.33WO3 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 nanoparticle thin film cut off the NIR radiation mainly by absorption.
