Synthesis of Molybdenum disulfide


There are different techniques used to obtain material layers. Figure 2, and each of them results in different quantities, shapes, and sizes. Mainly, the approaches used in synthesizing TMDs nanostructures are the top-down and the bottom-up approaches. The first approach depends on etching crystal planes from a substrate with the crystals laid over it, while in the second approach, the crystals are stacked over the substrate. Exfoliation is one of the top-bottom techniques for obtaining MoS2 layers. The weak Van der Waal forces between layers of TMDs paved the way in front of different exfoliation synthesizing techniques. Mechanical exfoliation is done using sticky tape rubbed out and shifted on a substrate with MoS2 flakes over it. The method gives a low yield and is good for lab use. Exfoliation can also be done in the liquid phase by adding a chemical compound and stirring, bubbling, or grinding. This method is simple and cheap but has low quality. The low yield in liquid exfoliation was avoided using carbon aerogel composites. The synthesizing is fast and completed in 30 minutes. It also avoids pyrophoric materials typically used in liquid exfoliation and increases the electrical conductivity and porosity of MoS2. Sonication is one of the techniques that showed simple synthesis when used with liquid exfoliation. It disposes of the use of hazardous materials used in liquid exfoliation. It is based on ultrasonic waves emitted from a probe in the shape of bubbles that peels MoS2 layers when they burst. The challenge in using sonication-assisted techniques is that they produce relatively small area MoS2 nanosheets, limiting their use in practical applications. Generally, Top-down techniques have low controllability, scalability, and high cost. The yield is increased to >90% when using ultrasound sonication with supercritical carbon in an intercalating solvent N-methyl-2-pyrrolidone (NMP). The method is fast, simple, and scalable. Sputtering is used to prepare layers of MoS2 to be used as lubricants, the layers have a low friction coefficient, but these frictional properties can be changed under humidity, especially for thin films of MoS2. 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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