Crystal Size Affects Tungsten Oxide Properties

Crystal refers to a unit structure with a large number of microscopic substances arranged in a regular way according to a certain rule. The arrangement rules and crystal sizes of tungsten oxide can be studied and judged from the size of the structure unit. The crystal size has a very important influence on the material properties of tungsten oxide.

As we all know, the size of tungsten oxide photocatalytic material properties have a significant impact. If the particle size of the tungsten oxide particles is smaller than the thickness of the space charge layer, the time for the photocarriers to diffuse to the tungsten oxide surface will shorten as the particle size decreases, thereby greatly increasing the utilization of photogenerated carriers. At the same time, the reduction of tungsten oxide particle size will increase the specific surface area. Thereby increasing the reactive sites of tungsten oxide and the amount of target adsorbed. In addition, the reduced tungsten oxide will widen the forbidden band width. This means that the oxidation-reduction ability of tungsten oxide is enhanced so that its photocatalytic reactivity can be enhanced.

Some scholars calcined by different temperatures of basic zinc carbonate, resulting in different sizes of zinc oxide photocatalyst. Their photocatalytic properties were also studied. It was found that the size of zinc oxide gradually increased with the increase of calcination temperature and the photocatalytic degradation of phenol decreased. This is due to the smaller particle size of the semiconductor with a larger specific surface area, a weaker space charge effect and a shorter photo-carrier-to-surface diffusion time, resulting in higher photocatalytic activity of smaller sized materials.

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