Method for preparing hexagonal boron nitride nanosheets by chemical stripping

Abstract

The invention provides a method for preparing hexagonal boron nitride nanosheets by chemical stripping, which comprises the following steps: (1) uniformly mixing and stirring every 0.5-5g of hexagonal boron nitride powder with 100ml of acid, adding potassium permanganate according to the potassium permanganate / hexagonal boron nitride powder mass ratio of 1:10:10:1, and continuing stirring to prepare a mixture; (2) stirring the mixture in an ice bath to react for 1-24 hours; dropwisely adding oxydol to remove the residual potassium permanganate; and (3) finally, washing the reaction product with water until the pH value is 6-8, dissolving in anhydrous ethanol for separation, and removing unstripped boron nitride powder to obtain the boron nitride nanosheets. The acid, potassium permanganate, oxydol and hexagonal boron nitride react together to prepare the boron nitride nanosheets; and thus, the method is simple to operate and low in cost, does not need complex or expensive equipment, and is beneficial to large-scale production.

Description

technical field [0001] The invention relates to a method for preparing hexagonal boron nitride nanosheets by chemical liquid phase stripping, and belongs to the technical field of crystal materials. Background technique [0002] Since Geim and Novoselov from the Department of Physics and Astronomy, University of Manchester, UK discovered graphene, a new type of two-dimensional nanomaterial in 2004, two-dimensional materials and their special properties have attracted more and more attention. Hexagonal boron nitride (h-BN) and graphene both have similar layered structures in structure, so they have attracted the attention and interest of many research groups at home and abroad. It is worth noting that h-BN has many special properties compared with graphene; for example, excellent physical and chemical properties such as wide band gap, high thermal conductivity, and excellent oxidation resistance. h-BN has great application prospects in high temperature resistance, deep ultra...

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Problems solved by technology

However, the above methods have certain deficiencies that limit the large-scale commercial production of boron nitride nanosheets

For example, the yield of the mechanical exfoliation method is very low; the size of the boron nitride nanosheets obtained by the liquid phase exfoliation method is small, and post-processing is troublesome; the equipment conditions of the vapor deposition method are harsh, the experimental process is difficult to control, and the toxicity is very high

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