Cs0.32WO3, or cesium tungsten bronze, has attracted much attention as a near-infrared absorbing material. And cesium tungsten bronze nano particles are mainly applied to produce greenhouse heat insulation coating. As such coating is more and more popular, the preparation of cesium tungsten bronze is also getting much attention. For example, some experts have successfully synthesized the highly crystalline and high purity Cs0.32WO3 nanoparticles through a spray pyrolysis route.
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According to the experts, the careful analyses disclosed the presence of cationic defects, that is, a tungsten deficiency and insufficient Cs doping in the Cs0.32WO3 nanoparticles. These cationic defects can be controlled by facile heat treatment in a mildly reducing atmosphere. In particular, the experts clarify that the tungsten deficiency is a key factor among the cationic defects to obtain high near-infrared absorption properties. Furthermore, it clearly demonstrates the precise tunability of the optical properties by means of the lattice constants of the Cs0.32WO3 crystal. The realized range of lattice constants is significantly wider than those previously reported. These findings should contribute to the engineering of Cs0.32WO3 structure and properties.
