Application Of Nanocrystalline Tungsten Oxide - Photochromic Devices

Chinese tungsten oxide nanomaterials have their own characteristics, and have achieved good progress. These studies focused on the preparation and characterization of specific micro-structure of the basic properties, such as structural, optical properties, electrochromic properties and gas sensing and so on. Using silica as a hard template by cetyl trimethyl ammonium chloride cofactor hydrothermal growth habit, got mesoporous tungsten oxide material. By using WCl6 as precursor, with cyclohexane as solvent, hydrothermally synthesized Nonstoichiometry alkylene oxide W18O49 nanowires at 200 ℃, after heat treatment showed high activity with the lowest concentration of the test gas sensing ethanol reached 2.7 ppm.

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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