Tungsten Oxide Nanocrystalline Application- Photochromic Devices

Photocatalytic activity of the tungsten oxide is mainly dependent on the surface area to volume ratio of the material, the surface of the tungsten oxide crystal material under UV irradiation to generate electron - hole pairs, and the dissolved oxygen atom adsorption surface trapped electrons generated anion oxygen, tungsten oxide as a non-toxic catalyst entrainment hole oxidation power, high content is relatively abundant in nature, and therefore is an important catalyst for effective degradation of organic dyes silk processing generated pollution. To enhance the catalytic efficiency, people use various methods to certain specific crystal structure of the tungsten oxide nanocrystals surface exposed, such as the one prepared by anodization having oriented mesoporous like tungsten oxide, titanium oxide modification may well improve WO3 composite catalytic activity.

From the perspective of tungsten understanding of chemical reactions, photochromic effect is reversible redox process tungsten atoms; from the point of view of the electronic band, photochromic process is the UV excitation of the valence band electronic transitions to the conduction band after the formation of electron-hole pairs, photo-generated electrons are trapped into a W6 + W5 +, holes generated or absorbed water is crystal surface oxide film formed after proton H + diffuses into crystals or thin films of tungsten oxide to produce bonded tungsten bronze structure, thus showing a blue. However, this mechanism does not explain the WO3-x (x <0.3) photochromic non reasons.

Based on the above analysis mechanism, people use various methods to optimize the synthesis of photochromic properties of tungsten oxide films, successfully tungsten oxide thin film materials used in smart windows, photonic devices (optical information storage, light regulation) and WO3 / TiO2 composite solar cells and other fields.

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