Tungsten Trioxide Nanoparticles Applied for Smart Window

Tungsten trioxide nanoparticles, as one of the most important raw materials applied in the preparation of smart window, have the characteristics of environmental protection and excellent optical properties. So, this new type of smart glass is increasingly used in the field of construction and auto. Therefore, not only the WO3 film, but also the Ti-doped tungsten trioxide electrochromic film has received much attention.

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For example, some experts used pulsed DC reactive magnetron sputtering to prepare Ti-doped tungsten trioxide electrochromic thin films on FTO transparent conductive glass substrates under different oxygen partial pressure conditions. Experts found that when the partial pressure of oxygen is low, the prepared film is in the under-oxidized triclinic system, which can be converted into a cubic crystal structure when increases oxygen. As the oxygen partial pressure increases, the degree of crystallization of the film increases, the surface particles of the film gradually bulge from the sheet, the particle size decreases, the surface roughness decreases, the film density increases, and the film changes from light blue to pale yellow. As the transmittance increases, the optical band gap gradually decreases.

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