Cesium tungsten bronze powder is a kind of infrared thermal insulation nano material. It is also a kind of tungsten bronze doped with alkali metal element (Cs).
As a kind of infrared thermal insulation material, cesium tungsten bronze has the ability to selectively transmit light waves. Generally, it has high visible light transmittance and low near-infrared transmittance. It means that cesium tungsten bronze may shield the near-infrared light while guaranteeing good daylighting, thereby playing a role of transparent heat insulation. And therefore, it has broad application prospect in energy efficient glass of building.
On the basis of the mechanism of tungsten bronze, it was found that tungsten bronze has good near-infrared shielding performance as there is small polaron effect and plasmon resonance on local surface. The small polaron is a lattice-bound carrier in tungsten bronze that is generated in the surrounding lattice. If the doped particles are smaller, the small polaron will be less bound, and it is more beneficial to absorb light, thereby the near-infrared shielding performance will be better.
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