Nano CsxWO3, or cesium tungsten bronze nano powder, may be used to prepare near-infrared shielding material, such as thermal insulation film, and therefore be used in the field of building energy conservation. In other words, the prepared nano material may be applied in glass products such as architectural glass door and glass window.
Some experts have studied the mechanism of cesium tungsten bronze. And they found that the doping ions can contribute electrons, so that part of W6+ is reduced to W5+. And a large amount of free electrons inside can also be regarded as electron gas under positive charge motion, which is equivalent to plasma. A plasma wave can be formed if these electrons oscillate together. When the plasma wave and the light wave meet, resonance may occur. When the carrier concentration increases, the resonance frequency of the plasma also increases, and then moves in the short-wave direction. In other words, the shielding ability of the material in the near-infrared band can be improved by changing the concentration of free electrons in the cesium tungsten bronze material.
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