Preparation method of two-dimensional boron nitride nanosheet

Abstract

The invention relates to a boron nitride nanosheet, in particular to a preparation method of a two-dimensional boron nitride nanosheet. The preparation method comprises: subjecting blocky hexagonal boron nitride, as a raw material, and a solid intercalation agent, which may fully decompose into gas after being heated, to premixing according to their mass ratio of 1:(5-50) to obtain a mixture; adding the premixed mixture into a ball mill tank, adding milling balls different in size according to a ball-to-material ratio of (6-80):1, with total charge quantity 1/3-2/3 of the ball mill tank by volume, stirring at the speed of 100-400 r/m for ball milling for 2-12 h so that edge defects occur to the boron nitride and the intercalation agent is embedded in the boron nitride for intercalation toobtain a boron nitride mixture physically intercalated with the intercalation agent, which is a uniform white solid mixture; heating the white solid mixture to obtain solid two-dimensional boron nitride nanosheet powder; alternatively, dispersing the white solid mixture in isopropanol to obtain two-dimensional boron nitride nanosheet dispersion.

Description

technical field [0001] The invention relates to boron nitride nanosheets, in particular to a method for preparing a two-dimensional boron nitride nanosheet using a solid-state intercalation agent that can be completely decomposed into gas after being heated. Background technique [0002] Since Geim, a professor at the University of Manchester in the United Kingdom, used the tape stripping method to strip graphene from graphite for the first time in 2004, the structure, properties and potential applications of two-dimensional materials have attracted more and more attention from researchers. Hexagonal boron nitride (h-BN), commonly known as "white graphite", and the corresponding two-dimensional boron nitride nanosheets are called "white graphene". Compared with graphene, two-dimensional boron nitride nanosheets have many excellent properties such as high thermal conductivity, high-strength mechanical properties, higher thermal and chemical stability, insulation (5.5eV broadb...

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Problems solved by technology

However, this method has certain risks: high-temperature objects are quickly immersed in liquid nitrogen, and a large amount of gas is easily generated.

In addition, the size of the two-dimensional boron nitride nanosheets obtained by this method is too small

[0004] In the mechanical ball milling method, using sodium hydroxide or a mixture of sodium hydroxide and potassium hydroxide as a medium for wet ball milling of hexagonal boron nitride is a common method for preparing two-dimensional boron nitride nanosheets (Nano Lett. 2015,15,1238-1244), however, due to the strong reaction between strong alkali and boron nitride and the large damage to the structure of boron nitride, the yield of the obtained two-dimensional boron nitride nanosheets (<20%) and low quality, it is difficult to meet the needs of large-scale preparation

Recently, using urea as the ball milling medium and hexagonal boron nitride for ball milling, the hexagonal boron nitride can be stripped into two-dimensional boron nitride nanosheets with surface amino functionalization, although the yield of this method is stronger than that of the alkali ball milling method (> 20%), but the size of the resulting two-dimensional boron nitride nanosheets is too small, which greatly limits its application prospects and potential (Nat.Commun.2015,6.)

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