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Advanced functional materials: preparation of transition metal halide nanosheets by solid phase stripping

wallpapers Cruise 2020-09-12

two-dimensional transition metal halides (MX2 m for vanadium tantalum molybdenum other transition metals X for sulfur selenium tellurium etc.) is a new two-dimensional material after graphene. Due to its adjustable chemical composition electronic structure it has important applications in electricity optics catalysis electrochemistry. In order to show its great potential the preparation of two-dimensional halogen compounds nanosheets is one of the current frontier hot spots. The mainstream preparation methods include mechanical stripping liquid phase stripping ion intercalation stripping solid phase stripping. However mechanical stripping liquid phase stripping ion intercalation stripping all have their own weaknesses such as low yield high safety risk low universality. The solid phase stripping method has the advantages of universal preparation high efficiency safety. Mainly through the ball milling method using the shear force generated by the grinding medium to achieve the two-dimensional material peeling. At present the preparation of graphene boron nitride has been realized. However solid phase exfoliation of transition metal selenides tellurides has not been reported.

Dr. Zhang Liangzhu his collaborators from Lei Weiwei research group of advanced cutting edge materials Institute of Deakin University in Australia designed MX2 crystals with cracks to solve this problem prepared 18 kinds of 2D transition metal halide nanosheets with a yield of gram level by solid phase stripping method. The effects of parameters such as milling time milling speed raw materials on the yield of nanosheets were discussed. By optimizing the parameters the yield of titanium telluride molybdenum selenide is higher than 80%. SPE process does not need to use toxic organic solvents such as dimethyl sulfoxide (DMSO) N-dimethylformamide (DMF) N-methyl 2-pyrrolidone (NMP). In addition the peeled nanosheets can be stored in powder form or dispersed in water in various concentrations for thin film device manufacturing. The advantages of solid phase stripping such as high efficiency safety macro preparation universality will greatly promote the application of two-dimensional transition metal halide nanosheets. Relevant research results are published in advanced functional materials ("solid phase exfoliation for producing discrete transition metal dichalcogenes nanosheets" doi: 10.1002/adfm.202004139).

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