MoS2 molybdenum disulfide additive supplier coating CAS 1317-33-5 MoS2 pure molybdenum disulfide powder

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Overview of 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℃, the density is 4.80g/cm³ (14℃), and the Mohs hardness is 1.0~1.5.

Characteristics of Molybdenum Disulfide

Molybdenum disulfide is the main component of molybdenite. Black solid powder with a metallic luster. The chemical formula is MoS2, the melting point is 2375°C, the density is 4.80g/cm3 (14°C), and the Mohs hardness is 1.0 to 1.5. It begins to decompose at 1370°C and decomposes into metallic molybdenum and sulfur at 1600°C. When heated in air at 315°C, it begins to be oxidized, and the temperature increases 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 boiled concentrated sulfuric acid. Slow oxidation occurs at 400 ℃ to form molybdenum trioxide.

Molybdenum disulfide has a high content of active sulfur, which is easy to cause corrosion to copper. It has been discussed in many books and papers on lubricant additives. In addition, when the parts made of copper and its alloys need to be lubricated, it is not impossible to use molybdenum disulfide lubricating products, but also need to add copper corrosion inhibitor.

How to Prepare Molybdenum Disulfide

Natural law

Molybdenum disulfide has excellent properties and broad application prospects, so a lot of research has been carried out on the preparation and application of nano-MoS2 at home and abroad.

MoS2 can be prepared by a natural method, namely the molybdenum concentrate purification method. This method is to remove the acid insoluble matter, SiO2, Fe, Cu, SiO2, Fe, Cu, SiO2, Fe, and Cu, Impurities such as Ca and Pb are further refined to obtain nano-MoS2. The American Climax Molybdenum Company adopted this method to produce MoS2. The nano-MoS2 prepared by this method can maintain the natural MoS2 crystal form, has good lubricating performance, and is suitable for making lubricants. However, the purity of nano-MoS2 produced by the natural method is not high, and the purification technology needs to be further improved. When the temperature is lower than 400 ℃, it is recommended to use MoS2 with lower cost when working in an ordinary atmosphere. It has a lubricating ability below 1300 ℃, and it is recommended to use MoS2 with a lower cost.

Chemical synthesis

Synthetic methods can produce sulfides with high purity, few impurities and fine particle size, and can prepare sulfides that meet different functional requirements. There are many preparation methods for nano-MoS2, such as ammonium tetrathiomolybdate thermal decomposition method, hydrogen sulfide or sulfur steam reduction method, high-energy ball milling, carbon nanotube space confinement method, hydrothermal synthesis method, high-energy physical method and chemical method combination. and many more. In general, there are two preparation methods, one can directly react the tungsten source or molybdenum source with a sulfur source to obtain nano-MoS2, or first react the tungsten source or molybdenum source with a sulfur source to obtain a precursor, and then pass the precursor through an appropriate The method is decomposed or reduced to MoS2.

Application of Molybdenum Disulfide

Molybdenum disulfide (MoS2) is a two-dimensional layered material composed of two chemical elements, molybdenum and sulfur. It has excellent optical, electrical, magnetic, mechanical and thermal properties, so it is widely used in energy storage, catalysis, semiconductor, lubrication and other fields. Its main uses are as follows:

1. As an additive for solid lubricants: MoS2 powder is known as "the king of advanced solid lubricants", with a friction coefficient between 0.05 and 0.09, and has the advantages of good dispersibility, non-bonding and anti-oxidation, and can be added in various In the grease, a non-stick colloidal state is formed, which can increase the lubricity and extreme pressure of the grease, making it more suitable for applications in high temperature, high pressure, high speed, and high load applications.

2. As a modifier for lithium-ion battery electrode materials: MoS2 is a low-dimensional transition metal layered material with a large distance between layers, thus giving it a higher lithium ion holding capacity and wider width. The unique ion transport channel, combined with graphene, can effectively make up for the shortage of the low storage capacity of the existing pure graphite anode materials.

3. As a catalyst: MoS2 is expected to replace precious metal platinum for electrochemical hydrogen evolution due to its high catalytic activity, good chemical stability, preferentially exposed active sites and long-range/short-range ordered atomic arrangement.

4. Fabrication of transistors: Ultra-thin MoS2 transistors with a length of fewer than 100 nanometers provide greater possibilities for the large-scale popularization of high-performance flexible electronic products such as medical monitors, fitness trackers, smart clothing and foldable smartphones.

5. For bionic eyes: Indium-doped molybdenum disulfide has the characteristics of ultra-low-power optical synapses, which can effectively reduce the power consumption of bionic eyes and solve the problem of difficult surface processing and integration.

6. For joint pain treatment: MoS2 coating is the key material of "targeted nanoprobe" in the nanotechnology of targeted analgesia diagnosis and treatment of osteoarthritis.

7. For in situ gelling systems: A novel in situ gelling systems without photoinitiators designed by Texas A&M University utilizes the photothermal properties of MoS2 and the inherent phase transition capability of thermally responsive polymers, exposed to Near-infrared radiation activates dynamic polymer-nanomaterial interactions.

Technical parameters of Molybdenum disulfide

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