F-doped cesium tungsten bronze for preparing infrared thermal insulation nano material has good near-infrared shielding performance. And the near-infrared shielding performance of F doped cesium tungsten bronze is believed to be derived from the effect of local surface plasmon resonance.
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Experts say that local surface plasmon resonance is a localized surface electromagnetic movement in which photosynthetic free electrons are tightly bound. Experts introduce that the plasma itself has an inherent vibration frequency. When the frequency of incident light is close to the natural vibration frequency of plasma on metal surface, the plasma on the surface is strongly coupled with the incident light field to generate a localized surface plasmon wave. The plasma wave propagates along the metal surface while the energy is constantly absorbed by the metal, so the energy of incident light is mostly absorbed. Local surface plasmon resonance generally occurs on nano-metals, while F doped cesium tungsten bronze with special tunnel structure contains a large number of free carriers. These free carriers make the F doped cesium tungsten bronze have properties close to those of metals. The free carriers on the surface form a surface plasmon that couples with the incident light, thus shielding a certain wavelength of light.
