GAO Xiaohong^1,2, WANG Yanming², FENG Huixia¹

(1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. College of Materials and Science;Technology Innovation Center of Modified Plastic of Hebei Province, Hebei University of Engineering, Handan 056038, China)

Abstract: The methods of producing boron nitride nanosheet (BNNS) by using hexagonal boron nitride (h-BN) powder as raw material were reviewed. The influence mechanism of raw material particle size, solvent, ultrasonic power, amount of grinding ball, additives and pretreatment technology on the preparation of BNNS was summarized.The surface modification methods of h-BN and BNNS were summarized, and the mechanism, advantages and disadvantages of covalent and non-covalent modification methods were summarized. Compared with chemical, liquid phase, mechanical and supercritical exfoliation methods, the medium-enhanced liquid phase exfoliation method is more simple, efficient and suitable for industrial batch production due to the π-π conjugation and lip-lip interaction between h-BN layers. However, it is necessary to select appropriate exfoliation additives and further reveal the mechanism of the exfoliation process. Due to the chemical inertia and local conjugation of B and N atoms in the h-BN structure, pure h-BN and BNNS are difficult to be directly modified by the covalent modification method based on chemical reactions. The non-covalent modification method of h-BN and BNNS is simple to operate, but the non-covalent modification method based on physical action has weak binding force and is easy to fail under harsh conditions such as high temperature and strong acid base.

Keywords: boron nitride nanosheets; exfoliation method; surface modification

Received： 2022-07-14，Revised：2022-11-17，Online：2022-12-06 08:55。

Funding Project：国家自然科学基金项目， 编号： 51805140； 河北省自然科学基金项目， 编号： E2018402121；中央引导地方科技发展资金项目，编号：206Z1201G，216Z1202G。

First Author:高晓红(1986—)，女，博士研究生，研究方向为纳米材料的制备及在润滑领域的应用。E-mail： gaoxiaohong2008@126.com。

Corresponding Author：冯辉霞(1966—)，女，教授，博士，博士生导师，研究方向为纳米材料的制备及应用。E-mail： fenghx@163.com。