Nano Tungsten Oxide Applied for Near Infrared Absorption Material

Nano tungsten oxide is a near infrared absorption material with high transmittance in the visible region. Also, it has strong plasma absorption in the near-infrared region near the visible region.

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It is believed that the performance of tungsten oxide anno particles is significantly related to its particle size, so it is necessary to control the grain size and specific surface area of the WO3 nano-semiconductor. When the particle size of the nano-semiconductor powder is r and the density is ρ, the total blocking area A of the nano-semiconductor powder with a certain mass m can be expressed by the following formula:

A=3ρ/4rm

It can be seen from the formula that the smaller the particle size r is, the larger the specific surface area is, and the larger the total blocking area A is. However, if the particle size is too small, changes in the electron density of the particles may cause a reduction in the solar shielding function. Therefore, the particle size r should have an optimum range to ensure high visible light transmittance and high near infrared absorption rate.

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