Cs doped tungsten oxide nanopowder may be applied for preparing a transparent thermal insulation paper, that is, a green heat insulating film, which has excellent near-infrared absorption property.
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Experts said that the nano cesium doped tungsten oxide powder used as the raw material is actually cesium tungsten bronze nano powder, which can exhibit excellent transparent heat insulation performance. In addition, experts also introduced that the fluorine-doped cesium tungsten bronze nano powder exhibits better transparent heat insulation performance than the pure cesium tungsten bronze powder. This is because F ions can improve the performance of nano cesium tungsten bronze powder from three aspects: inducing the formation of rod-like morphology of cesium tungsten bronze powder and improving the near-infrared absorption; incorporating the cesium tungsten bronze oxygen vacancies to increase the forbidden band width and visible light transmission rate; and the cesium tungsten bronze oxygen vacancies can increase carrier concentration and improve near-infrared absorption.
