Preparation method of small-size transition metal chalcogenide two-dimensional nanosheet

Abstract

The invention relates to a preparation method of a small-size transition metal chalcogenide two-dimensional nanosheet. The method is characterized in that the powder of a block is treated as a raw material; a polymer is used as an additive, and polymer assistant ball milling is performed to obtain transition metal chalcogenide two-dimensional nanosheets with different sizes and different components. The method comprises three steps of weighing high polymers and polymer assistant ball milling prepared blocky powder; performing ball milling, separating, water adding, uniformly mixing and movingout; performing gradient centrifugation to obtain products with different sizes; purifying to remove excessive polymers. With the adoption of the method, the problems such as low yield, non-uniform appearance and complex processes of a current preparation method of a current small-size transition metal chalcogenide two-dimensional nanosheet can be solved; the method has the advantages of being high in yield, simple in processes, high in generality, easy to control processes,and the like; the prepared small-size transition metal chalcogenide two-dimensional nanosheet can be applied to differentfields, such as the fields of catalyzing, photoelectric and biomedicines.

Description

technical field [0001] The invention relates to a preparation method of two-dimensional nanosheets of transition metal chalcogenides, in particular to a method for preparing two-dimensional nanosheets of transition metal chalcogenides with controllable size through polymer-assisted ball milling, belonging to nanomaterials The field of synthetic technology. Background technique [0002] In recent years, nanomaterials such as two-dimensional transition metal chalcogenide nanosheets (2D TMDCNSs) with graphene-like two-dimensional structure have been developed (Chemical Reviews, 2013, 113, 3766). 2D TMDC NSs are a sandwich structure (MX 2 , M=Mo, W, V, Nb, Ta, Ti, Zr, Hf, etc.; X=S, Se, Te) compound, which has a layered structure, and the metal atoms in the layer and the chalcogenide nonmetal atoms share a common Valence bonding, weak van der Waals force exists between layers, and 2D TMDC NSs can be prepared by breaking the weak force between layers (Chemical Society Reviews, ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the steps are cumbersome and time-consuming, the size of the product is large and the uniformity is not good

The disadvantage of this method is that the yield is low and the product uniformity is poor

The disadvantage of this method is that the organic solvent has certain volatility and toxicity, the solvent must be replenished in time during the process, the stripping efficiency of wet ball milling is low, and the product size is large

[0004] So far, the preparation methods of transition metal chalcogenide two-dimensional nanosheets reported in the literature and patents all have the following common problems: such as high cost, cumbersome process, harsh reaction conditions, high toxicity of raw materials, and inability to prepare small-sized nanosheets. Sheets, etc., and the yield is low, it is difficult to meet the needs of mass production

The preparation of two-dimensional transition metal chalcogenide nanosheets by ball milling has the advantages of simple process, high exfoliation efficiency, large yield, energy saving and high efficiency, and environmental friendliness.

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