Exfoliated Molybdenum disulfide flakes
What is Molybdenum disulfide?
MoS2 is employed as a cocatalyst for desulfurization in petrochemistry, for example, hydrodesulfurization. The effectiveness of the MoS2 catalysts is enhanced by doping with small amounts of cobalt or nickel. The intimate mixture of these sulfides is supported by alumina. Such catalysts are generated in situ by treating molybdate cobalt or nickel-impregnated alumina with H2S or an equivalent reagent. Catalysis does not occur at the crystallites' regular sheet-like regions but at the edge of these planes.
Catalysis of Molybdenum disulfide
MoS2 finds use as a hydrogenation catalyst for organic synthesis. It is derived from a common transition metal, rather than group 10 metal, as are many alternatives; MoS2 is chosen when catalyst price or resistance to sulfur poisoning is of primary concern. MoS2 is effective for the hydrogenation of nitro compounds to amines and can be used to produce secondary amines via reductive amination. The catalyst can also affect the hydrogenolysis of organosulfur compounds, aldehydes, ketones, phenols, and carboxylic acids to their respective alkanes. However, the catalyst suffers from rather low activity, often requiring hydrogen pressures above 95 atm and temperatures above 185 °C.
Exfoliated MoS2 flakes
While bulk MoS2 in the 2H-phase is known to be an indirect-band gap semiconductor, monolayer MoS2 has a direct band gap. The layer-dependent optoelectronic properties of MoS2 have promoted much research in 2-dimensional MoS2-based devices. 2D MoS2 can be produced by exfoliating bulk crystals to produce single-layer to few-layer flakes through a dry, micromechanical process or solution processing. Micromechanical exfoliation, also pragmatically called "Scotch-tape exfoliation," involves using an adhesive material to repeatedly peel apart a layered crystal by overcoming the van der Waals forces. The crystal flakes can then be transferred from the adhesive film to a substrate. Konstantin Novoselov and Andre Geim first used this facile method to obtain graphene from graphite crystals. However, it can not be employed for uniform 1-D layers because of the weaker adhesion of MoS2 to the substrate (either Si, glass, or quartz). The scheme above is good for graphene only. While Scotch tape is generally used as an adhesive, PDMS stamps can also satisfactorily cleave MoS2 if it is important to avoid contaminating the flakes with residual adhesive. Liquid-phase exfoliation can also produce monolayer to multi-layer MoS2 in solution. A few methods include lithium intercalation, delaminating the layers, and sonication in a high-surface tension solvent.
Price of Molybdenum disulfide
Molybdenum disulfide particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Molybdenum disulfide. A large amount of large amount will be lower. The Price of Molybdenum disulfide is on our company's official website.
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