Transition metal disulfides having a lamellar structure have been found in many singular properties in recent years and have attracted great research interest. In general, the method of stripping lithium alkyl intercalation is the most common method of chemical glass molybdenum disulfide/tungsten disulfide nanosheet, and the best peeling effect is through the intercalation of alkyl lithium into molybdenum disulfide/ The tungsten disulfide nanosheet layer is then treated in water and the van der Waals force is destroyed by the exothermic reaction of the alkyllithium with water to obtain a sheet. However, this reaction process is very intense and the residual lithium compound on the sheet is very sensitive in air and very difficult to remove. It is difficult to prepare quantum dots on the basis of transition metal disulfide nanosheets. So far only a few studies have produced molybdenum disulfide quantum dots, but their requirements for equipment are high and the subsequent separation process is often very complicated.
Wu Peiyi and Xu Shengjie, State Key Laboratory of Polymer Molecular Engineering, Fudan University, successfully prepared uniformly dispersed monolayer quantum dots by ultrasonically and heating the molybdenum disulfide/tungsten disulfide powder in a solvent. The prepared quantum dots were simply allowed to stand. Or it can be separated by centrifugation. Quantum dots have very strong fluorescence and can be used as fluorescent labeling probes. The experimental results show that the molybdenum disulfide/tungsten disulfide quantum dots have very high cell membrane permeability and very little cytotoxicity. At the same time as the preparation of the quantum dots, a nano-layer of molybdenum disulfide/tungsten disulfide loaded with quantum dots can be obtained, and the composite material has a very strong catalytic activity for hydrogen evolution reaction. Its catalytic starting potential reaches -120 mV, which is close to commercial platinum catalysts. The results are published in Advanced Functional Materials.
This work not only proposed this method not only can be very simple to prepare transition metal disulfide, but also is likely to be used for the preparation of other sheet material quantum dots and quantum dot/sheet composites.
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