Home > News >

What is Molybdenum disulfide?

wallpapers News 2021-11-23
What is Molybdenum disulfide?
Molybdenum disulfide is an inorganic substance with the chemical formula MoS2, which is the main component of molybdenite. Black solid powder with a metallic luster. The melting point is 2375°C, the density is 4.80g/cm³ (14°C), and the Mohs hardness is 1.0~1.5.
The main component of molybdenite. Black solid powder with a metallic luster. Chemical formula MoS2, melting point 2375℃, density 4.80g/cm3 (14℃), Mohs hardness 1.0~1.5. [1] It begins to decompose at 1370°C and decomposes into metallic molybdenum and sulfur at 1600°C. It starts to be oxidized when heated at 315°C in the air, and the temperature rises, and the oxidation reaction accelerates. Molybdenum disulfide is insoluble in water, dilute acid, and concentrated sulfuric acid, generally insoluble in other acids, alkalis, and organic solvents, but soluble in aqua regia and boiling concentrated sulfuric acid.
Uses of molybdenum disulfide
Molybdenum disulfide is an important solid lubricant, especially suitable for high temperatures and high pressure. It is also diamagnetic, can be used as a linear photoconductor and a semiconductor showing P-type or N-type conductivity, and has the functions of rectification and energy conversion. Molybdenum disulfide can also be used as a catalyst for the dehydrogenation of complex hydrocarbons.
The main function of molybdenum disulfide used in friction materials is to reduce friction at low temperature, increase friction at high temperature, and have a small loss on ignition. It is volatile in friction materials.
In addition, molybdenum disulfide can also become a new material for making transistors. Compared with graphene, which is also a two-dimensional material, molybdenum disulfide has an energy band gap of 1.8 eV, while graphene does not have an energy bandgap. Therefore, molybdenum disulfide may have a broad application space in the field of nano-transistors. Moreover, the electron mobility of a single-layer molybdenum disulfide transistor can reach up to about 500 cm^2/(V·s), and the current switching rate can reach 1×10^8.
Preparation method of molybdenum disulfide
MoS2 can be prepared by the natural method, namely, the molybdenite concentrate purification method, which is to remove the acid-insoluble matter, SiO2, Fe, Cu, Impurities such as Ca and Pb are further refined to obtain nano-MoS2.
The synthetic method can produce sulfides with high purity, fewer impurities, and fine particle size, and can prepare sulfides that meet different functional requirements. Therefore, the production of nano sulfides by synthetic methods has always attracted much attention. There are many methods for preparing nano-MoS2, such as ammonium tetrathiomolybdate thermal decomposition method, hydrogen sulfide or sulfur vapor reduction method, high-energy ball milling method, carbon nanotube space confinement method, hydrothermal synthesis method, high-energy physical method, and chemical method combination, and many more.
Molybdenum disulfide protection
When molybdenum disulfide is used in engineering production, it should be operated in a closed manner and partially exhausted.
When the concentration of molybdenum disulfide dust in the air exceeds the standard, it is recommended that the operator wear a self-priming filter dust mask. In case of emergency rescue or evacuation, relevant personnel should wear air respirators.
Once the molybdenum disulfide leaks, immediately isolate the leaked contaminated area, restrict personnel access, and cut off the fire source. To ensure safety and avoid accidents, it is recommended that emergency personnel wear dust masks (full-face masks) and wear protective clothing. When handling the leaked dust, avoid raising dust. Carefully sweep up the molybdenum disulfide, place it in a bag and transfer it to a safe place. If a large amount of molybdenum disulfide leaks, it needs to be covered with plastic sheeting or canvas, and then collected and recycled, or transported to a waste disposal site for disposal.
Molybdenum disulfide Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. The Molybdenum disulfide produced by our company has high purity, fine particle size, and impurity content. For the latest price of Molybdenum disulfide, send us an email or click on the needed products to send an inquiry.