Tungsten Oxide Structural Dimension

Tungsten oxide materials by dimension can be divided into zero-dimensional nanosphere, one-dimensional nanofibers and nanotubes, two-dimensional nanosheets and three-dimensional interconnect structure.

Tungsten oxide zero-dimensional structure has a large specific surface area, with organic pollutants have more contact area, which has high degradation efficiency. The one-dimensional nanofibers and nanotubes have a short diffusion distance and a light scattering property, which can reduce recombination of photogenerated electrons and holes. Two-dimensional nanosheets not only have a large specific surface area, but also have a smooth surface and high adhesion. It can photocatalytic good contact with the material being catalyzed to improve the photocatalytic efficiency. The special structure of the three-dimensional interconnection structure can provide an effective diffusion channel to exhibit higher carrier mobility and promote efficient separation of photogenerated electrons and holes.

One of the most common uses of tungsten oxide is as a photocatalyst. It has a wide range of application prospects in photolysis water, photocatalytic hydrogen evolution and pollutants degradation. But in fact, some disadvantages of tungsten oxide have limited its application. Tungsten oxide bandgap at 3.2 eV or so, are wide bandgap semiconductor, only the absorption of ultraviolet light, the utilization of sunlight is relatively low. In addition, the photocatalytic mechanism shows that some photoelectrons and holes generated by tungsten oxide excited by light are easily recombined, reducing the photocatalytic efficiency.

Therefore, some modifications should be made to tungsten oxide modification, its purpose has two purposes: First, to improve the utilization of tungsten oxide on sunlight; the second is to avoid photogenerated electron and hole recombination to improve its separation efficiency. In the case of tungsten oxide itself, tungsten oxides of different structural dimensions will have different structures, topographies, sizes and specific surface areas. These factors will affect the tungsten oxide light absorption and electron transport properties, thereby affecting the photocatalytic efficiency.

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