Nano Cesium Doped Tungsten Oxide Applied for Thermal Insulation Film

Nano cesium doped tungsten oxide may be applied for preparing thermal insulation film. And such heat insulation film can be prepared by the following steps: fully grinding and ultrasonically dispersing the cesium doped tungsten oxide nano powder in a citric acid solution, and then adding it to a 0.1g/mL polyvinyl alcohol solution. Then, the mixture was stirred in a water bath at 80°C for 30min, aged 1-2d to obtain a latex to be coated, and a film was prepared on a glass slide by a dip-drawing method.

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As for the absorbing properties of the heat insulating film, experts have said that, according to the free electron gas model, free carriers can excite plasma vibration, and the square of the plasma absorption edge frequency is proportional to the free carrier concentration. When the frequency of the incident light is less than the frequency of the absorption edge of the plasma, the light is strongly reflected. And when the frequency of the incident light is greater than the frequency of the absorption edge of the plasma, free carrier absorption occurs. It can be inferred that after ultraviolet light irradiation, the free carrier concentration in the cesium doped tungsten oxide system increases, and the absorption edge frequency of the plasma moves toward the short-wave high-frequency direction, and finally, under the combined action of light absorption and reflection, The absorption edge of the transmission spectrum of the cesium doped tungsten oxide film moves in the short-wave direction.

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