Rare earth trivalent ions have rich 4f energy level configuration, and their fluorescence characteristics are greatly affected by the crystal field environment and the symmetry of the lattice. At present, many scholars use the small size effect of semiconductor nano materials (ZnO, TiO₂) and lattice sensitization to improve the optical properties of rare earth trivalent ions, which are widely used in biological fluorescent probes, optical devices and new luminescent materials.

WS₂ and reduced graphene oxide (WS₂/rGO) nanocomposite is prepared by in situ reduction of graphene oxide. This kind of material has good catalytic activity for hydrogen evolution as well as high sodium storage capacity. It can be widely used in many fields such as supercapacitor, Na-ion battery and so on.

Tungsten disulfide is not only a kind of solid lubricating material with high quality, but also a catalyst with good activity. It is widely used in lubrication material,  piezoelectric material and other important fields, which is closely related to some of its properties.

Tungsten disulfide engine oil is a kind of lubricating oil with high quality and high efficiency. It can not only reduce the wear between metal parts effectively, but also improve the overall performance of the engine, making its operation more stable.

Recently, a new type of transistor with heterojunction of tungsten disulfide and graphene has been created by the research team of University of Groningen. Details of the research have been published in the October 16 issue of Physical Review B.

Tungsten disulfide with good lubricating performance works stably under the condition of high temperature, high speed and heavy load, which is the working environment of crankshaft. Therefore, tungsten disulfide is an ideal material for crankshaft lubrication.

Tungsten disulfide is a kind of lubricating material with high quality. It can be used in automotive gear lubrication to speed up the heat dissipation and reduce the wear on the gear surface. The lubrication treatment with tungsten disulfide is usually simple, which make the material an ideal choice for the automotive gear lubrication.

Tungsten disulfide has good high temperature and extreme pressure resistance, so it is suitable for the lubrication of automotive gear. Applied on the gear surface, tungsten disulfide can reduce the friction loss in the operation process and greatly prolong the gear’s service life.

With good lubricating performance and excellent extreme pressure resistance, tungsten disulfide is an ideal material for connecting rod lubrication. This kind of material works stably under the condition of high temperature and heavy load. It can prolong the service life of connecting rod effectively.

With the continuous exploitation of tungsten resources, scheelite and medium ores with high impurity content become the main sources of tungsten smelting raw materials. In the existing technology, the smelting of Scheelite Concentrate and medium ore generally adopts the high alkali pressure boiling technology, and the alkali input is generally 2.8-4 times of the theoretical amount. The quality ratio of excess NaOH and WO₃ in the coarse sodium tungstate solution obtained after the alkali pressure boiling slurry is 0.7-1.2. If not recovered, it will not only bring adverse effects on the subsequent process, but also consume sulfuric acid to neutralize it before discharging.