六方氮化硼的液相剥离及其在电子器件热管理应用的研究进展

Research progress in liquid phase exfoliation of boron nitride and their applications in thermal management of electronic devices

六方氮化硼纳米片(BNNS)具有优异的导热性、绝缘性、化学稳定性、耐高温性,在电子器件热管理领域具有广泛的应用前景。然而,如何快速、规模化地获得高质量的BNNS仍是其商业应用所面临一个重要挑战。液相剥离法是制备BNNS最有前景的方法之一,具有工艺简单、纳米片质量高、可规模化生产等优点。本文首先总结了近年来BNNS的液相剥离方法,重点介绍3种用于液相剥离BNNS的方法(h-BN剥离的溶剂选择、h-BN的非共价键改性以及共价键改性);其次,深入探讨了上述3种方法的剥离机理以及存在的不足(有机溶剂污染环境问题,部分修饰剂相容性差,共价键改性困难)。随着剥离分散机理的深入研究,液相剥离法将满足高质量高效率的BNNS的制备需求,使其在电子器件热管理领域发挥重要作用。

Boron nitride nanosheets(BNNS)exhibit prominent thermal conductivity,good electrical insulation,as well as high chemical and thermal stability,thus showing their promising application in thermal management of electronic devices.However,it is still challenging to obtain BNNS with high quality by facile and scalable production methods.Liquid phase exfoliation is considered to be one of the most promising methods to prepare BNNS due to its facile and scalable preparation procedure of nanosheets with high quality.Recent advances in liquid phase exfoliation methods for the preparation of BNNS were summarized in this review,with specially focusing on solvent selection of h-BN exfoliation,non-covalent and covalent surface modification of boron nitride.Furthermore,the exfoliation mechanism of the above three methods and the existing shortcomings were discussed in details(environmental problems caused by organic solvents,poor compatibility in some modifiers,difficulties in covalent bond modification).With the further study of the exfoliation mechanism,the liquid phase exfoliation method will be able to meet the requirement of high quality and high efficiency preparation of BNNS,making it play an important role in the thermal management of electronic devices.