F-doped cesium tungsten bronze for transparent thermal insulation material has better near-infrared shielding properties than cesium tungsten bronze, which means that the doped cesium tungsten bronze is a better thermal insulation material than cesium tungsten bronze for building energy efficiency. And this is because the tungsten bronze doped with fluorine atoms exhibits higher concentration carriers and more excellent conductivity.
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Certainly, at present, the tungsten bronze that is mainly used to prepare transparent heat insulating materials is cesium tungsten bronze. Therefore, the synthesis process of cesium tungsten bronze has also been relatively mature. For example, a simple and low-cost hydrothermal synthesis method can be used to synthesize cesium tungsten bronze with better transparent heat insulating properties. Also, a sol-gel method, a sputtering method and many other preparation method can be applied to prepare cesium tungsten bronze. But why do higher concentrations of carriers predict better near-infrared shielding performance? Because it is reported that the carrier concentration determines the near-infrared shielding performance.
