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What is molybdenum disulfide

Molybdenum disulfide is a compound composed of two elements, molybdenum, and sulfur, with the chemical formula MoS2. The compound belongs to the transition-metal disulfide group, which has a silver-black sheen and occurs in nature as molybdenite, the most common molybdenite ore. Molybdenum disulfide crystals are usually found in powder form; they are insoluble in dilute acids and do not readily oxidize. Molybdenum disulfide is similar to graphite in appearance and is often used as a solid lubricant because of its low friction coefficient and high robustness. Bulk molybdenum disulfide solid is a diamagnetic indirect band gap semiconductor similar to silicon, with a band gap of 1.23eV. Crystalline powder. All molybdenum disulfide crystals are layered, with a single molybdenum plane sandwiched between two layers of sulfur atoms, forming a single molybdenum disulfide plane. Massive disulfide comprises stacked single molybdenum disulfide planes, and van der Waals forces connect the layers. Molybdenum disulfide crystals have two structures in nature, belonging to hexagonal crystals (2H-MoS2) and tripartite crystals (3R-MoS2). Another metastable phase (1T-MoS2) belongs to the tetragonal system. Molybdenum disulfide is a good lubricant material because of its layered structure and low friction coefficient. When shear stress is applied to the material, molybdenum disulfide dissipates energy by sliding between layers. Molybdenum disulfide is insoluble in water, dilute acid, and concentrated sulfuric acid, generally insoluble in other acids, bases, and organic solvents but soluble in hot sulfuric acid. Oxidation occurs slowly at 400 °C to form molybdenum trioxide. Ferrotitanium reagent can be used to test the generated molybdenum trioxide, the product is first treated with sodium hydroxide or potassium hydroxide solution (the principle is to convert molybdenum trioxide into molybdate), and then drop the solution of ferrotitanium reagent, and the generated sodium molybdate or potassium molybdate reaction, produce the golden key. This method is so sensitive that even trace amounts of molybdate can be detected. And if no molybdenum trioxide is made, the solution will not produce a golden color because molybdenum disulfide will not react with sodium hydroxide or potassium hydroxide solutions. If you are looking for high quality, high purity and cost-effective molybdenum disulfide, or if you require the latest price of molybdenum disulfide, please feel free to email contact mis-asia.

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