Metal oxides play a key role in the development of many advanced functional materials and smart devices. Among many metal oxides, tungsten trioxide (WO₃) is a kind of unique material, which has attracted much attention due to its versatility. For example, WO₃ is an n-type semiconductor with various crystal forms, band gap width of 2.5-2.8ev, and visible light response characteristics. Therefore, WO₃ can be used as light sensing device, photochromic device, transparent electrode, visible light catalyst, etc.

In recent years, more and more researchers have paid attention to the preparation of core-shell inorganic / polymer nanocomposite particles by coating polymer on the surface of inorganic nano particles, which has broad application prospects in microelectronics, optoelectronics, biological and medical materials and other fields.

Tungsten oxide is a typical transition metal oxide with a band gap of 2.4-2.8ev, which belongs to a typical n-type semiconductor. In addition to catalysis, electrochromism, battery electrode, solar energy absorbing material and invisible material, tungsten oxide also has the properties of semiconductor functional materials such as pressure sensitive, thermal sensitive and gas sensitive.

Tungsten disulfide with excellent lubrication performance is a kind of green solid lubricating material. It can be used as a high-temperature lubricant for reflow furnace lubrication, keeping the relevant parts work stably under high temperature.