Preparation method of few-layer hexagonal boron nitride

Abstract

The invention provides a preparation method of few-layer hexagonal boron nitride, belongs to the technical field of nano-materials, and solves the technical problems that an existing process for preparing the few-layer hexagonal boron nitride is complicated, low in productivity and the like. The preparation method includes the steps: placing a high-temperature stainless steel container with boron nitride powder into a muffle furnace at normal temperature; beginning to heat the boron nitride powder, performing high-temperature baking on the boron nitride powder, and keeping the temperature for 5min-300min; taking out the container after temperature keeping, rapidly adding normal-temperature cooling solvents into the stainless steel container with the boron nitride powder, and performing quenching on the boron nitride to reach normal temperature; performing centrifuging on mixture after cooling, and taking liquid supernatant to obtain a few-layer hexagonal boron nitride sample. The preparation method has the advantages that the method is high in efficiency and productivity, green, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a preparation method of few-layer hexagonal boron nitride. Background technique [0002] Since graphene was first prepared by British scientists in 2004, graphene or its analogues have attracted widespread attention. The preparation of few-layer hexagonal boron nitride also lays the foundation for its application in the field of composite materials and nano-optoelectronics. [0003] Currently, there are three mainstream methods for preparing boron nitride: liquid phase ultrasonic method, mechanical stripping method and chemical vapor deposition method. [0004] The solvents required for liquid phase ultrasonic preparation are often toxic reagents, there are serious safety hazards in the process of stripping and separation, and the preparation efficiency is not high, which still needs to be further improved (Coleman J N, Lotya M, O'Neill A, et al.Two -dimensional nanos...

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Problems solved by technology

[0004] The solvents required for liquid phase ultrasonic preparation are often toxic reagents, there are serious safety hazards in the process of stripping and separation, and the preparation efficiency is not high, which still needs to be further improved (Coleman J N, Lotya M, O'Neill A, et al.Two -dimensional nanosheets produced by liquid exfoliation of layered materials[J].Science,2011,331(6017):568-571);

[0005] The mechanical exfoliation method requires high personal skills of the operator. Although it has excellent crystal quality, the yield is extremely low, and the application scenarios are extremely limited. It is mostly used for laboratory demonstrations (Gorbachev R V, Riaz I, Nair R R, et al. Hunting for monolayer boron nitride: optical and Raman signatures[J].Small,2011,7(4):465-468)

[0006] And the chemical vapor deposition method is not suitable for mass production to prepare thin layer hexagonal boron nitride

First of all, the products prepared by this method are mostly few-layer or single-layer films, which are suitable for applications in fields such as composite materials; secondly, the complexity of the reaction mechanism leads to too many technical requirements during actual preparation, and it is difficult to control product quality (Lee K H , Shin H J, Lee J, etal.Large-scale synthesis of high-quality hexagonal boron nitride nanosheets for large-area graphene electronics[J].Nano letters,2012,12(2):714-718)

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