Acetone plays an important role in the growth of tungsten trioxide. The addition of acetone during the preparation of tungsten trioxide will result in the formation of tungsten oxide crystal cavities, which will cause the sample to lose its crystalline water. In general, tungsten oxide crystal growth is determined by its intrinsic crystal structure and external reaction environment.

The nature of the reaction system of tungsten trioxide, will continue to change as the amount of acetone added. The addition of acetone will change the solubility of sodium tungstate solution, the system of saturated vapor pressure and viscosity properties. These factors affect the process of nucleation, growth and mass transfer of tungsten trioxide, respectively. Acidified sodium tungstate can be dissolved in a mixed solvent of water and acetone, but can not be dissolved in acetone.

Tungsten trioxide photocatalyst has a wide range of applications because of its excellent material properties. Tungsten trioxide photocatalysts have different methods of synthesis, and ion exchange is a method based on ion exchange reactions.

Tungsten trioxide has two main disadvantages as a photocatalyst: the narrow spectral range that can be utilized because of the wide bandgap of tungsten trioxide. And the utilization of photogenerated electrons is relatively low due to the alignment of the conduction band of tungsten trioxide, so that the utilization of photogenerated holes of tungsten trioxide is suppressed. Based on these two drawbacks, the carbon doping technique can further improve the photocatalytic activity of tungsten trioxide.

Magnetron sputtering method is a common method of preparing tungsten oxide thin film. The principle of the magnetron sputtering method for the preparation of tungsten oxide thin film is that when the argon ions are accelerated by the cathode and bombard the cathode target surface, the surface atoms of the tungsten oxide target are sputtered. The tungsten oxide surface atoms then deposit on the substrate surface to form a thin film.

In recent years, with the continuous development of science and technology, spherical tungsten powder is widely used in thermal spraying, porous materials and powder metallurgy industry. Its demand is also increasing. In the field of thermal spraying, spherical tungsten powder not only has good fluidity, but also has more uniform and dense coating so that the product has better abrasion resistance.

Photocatalysis technology is a kind of chemical treatment method using light-driven organic pollutants to make it redox reaction. An important aspect of studying tungsten oxide photocatalysis is the study of functional materials that can be used as photocatalysts. Tungsten oxide is an important transition metal oxide, and its properties will vary depending on the type of crystal and the water it contains.

Tungsten oxide photocatalyst dye sensitization process, is the use of dyes and other materials that can absorb visible light. Tungsten oxide modified surface is to broaden the optical response of tungsten oxide photocatalyst range. Thereby increasing light utilization and increasing photocatalytic activity.

Tungsten trioxide, as an important transition metal oxide, has been widely used in many fields of research, such as photochromism, electrochromism, lithium-ion batteries and gas-sensitive materials.

The ammonium ion in urea stabilizes the skeleton of tungsten trioxide. If the removal of ammonium trioxide in the framework of ammonium ions, will lead to the collapse of the framework of tungsten trioxide. This shows that the monovalent cation in urea plays an important role in stabilizing the structure of tungsten trioxide. Since urea hydrolyzes under hydrothermal conditions, ammonium and bicarbonate ions are released and the pH of the reaction system is slowly adjusted.