Tungsten trioxide photocatalysts are widely used in various fields because of their good photosensitivity, good electron transport properties, and excellent photostability.

The effect of topography on the properties of tungsten trioxide materials is largely changed from the specific surface area of tungsten trioxide, the surface structure, the different exposed crystal planes of different topographies, and the quantum size effect.

Sol-gel method is a more commonly used and effective preparation method of nano-semiconductor tungsten trioxide powder. Its general procedure is to hydrolyze tungstic acid inorganic salts or metal alkoxides and then polymerize and gel. Or in the preparation of tungstic acid solution system by adding organic acids as a ligand, inorganic acid and alkali tungstic acid solution system to adjust the p H value. Finally, the solvent was slowly evaporated and a gel was obtained. The gel was dried and calcined to give the final product. The advantage of the sol-gel method is that the tungsten oxide product has the advantages of smaller particle size, good uniformity and high purity, and is suitable for industrial production. Its disadvantage is that it is difficult to control the transformation of sol-gel, such as poor transformation, the gel tends to agglomerate after drying, and the synthesis period is generally longer.

The laser ablation method uses the characteristics of a pulsed laser beam to instantaneously heat the target above the gasification temperature, then place the tungsten foil in distilled water and then irradiate the tungsten foil with a laser while stirring the aqueous solution. Finally, after the sample is aged, filtered, washed and calcined, the leaf-shaped tungsten trioxide nano-sheets can be obtained. In the process, steam plume will be generated, while steam plume is composed of target atoms, ions and atomic clusters, collides with ambient gas atoms and decelerates during flight, collides with each other to nucleate and grow into nano-particles.

Different synthesis methods have a significant impact on the physical and chemical properties of tungsten trioxide. Because of the different synthesis methods, will directly affect the synthesis of tungsten trioxide crystal structure, particle size and so on. Currently there are a variety of ways to prepare tungsten trioxide, but according to the nature of raw materials and the reaction process can be divided into: solid phase method, gas phase method and liquid phase method.

Chemical precipitation is a method of preparation of tungsten trioxide. Chemical precipitation is the use of chemical reactions in the liquid phase to synthesize nano-tungsten trioxide powder. That is, adding the required amount of precipitating agent to the reaction liquid system to obtain the precursor precipitate, and converting the precursor into the final nano-tungsten oxide powder material through the drying and calcining processes. Some scholars have synthesized zinc oxide powder by chemical precipitation method.

Sodium tungstate is a chemical that is soluble in water, sparingly soluble in hydrogen but insoluble in ethanol, and glossy, lamellar or crystalline powders. Sodium tungstate weathering when exposed to the air, when dissolved in water, the aqueous solution was slightly alkaline, heated to 100 ℃ will lose crystal water and become anhydrous.

odium tungstate is a chemical that is soluble in water, sparingly soluble in hydrogen but insoluble in ethanol, and glossy, lamellar or crystalline powders. Preparation of sodium tungstate is mainly divided into three categories, as follows:

Cesium tungsten bronze citrate synthesis method is the use of hydrothermal conditions to easy to operate and lower cost of sodium tungstate and cesium carbonate as raw materials through the induction of cesium tungsten bronze synthesis powder. Cesium tungsten bronze citrate synthesis method is different from the traditional preparation methods such as high temperature and reducing atmosphere, the equipment requires a higher temperature thermal reduction method.

The morphology and structure of the surface of the tungsten oxide film will largely affect the properties and applications of the tungsten oxide material. The difference of the microstructure will make the tungsten oxide film show different characteristics to the outside, and then, in various applications of the tungsten oxide film. The field gets different application and development. Tungsten oxide grape film belongs to the tungsten oxide film, which is a new surface topography.