Sun Rong research team of Shenzhen Advanced Institute of Chinese Academy of Sciences has made new progress in the field of general preparation technology of two-dimensional materials

Sun Rong, research team of advanced materials center, Shenzhen Institute of advanced technology, Chinese Academy of Sciences, has made important progress in the field of general preparation technology of two-dimensional materials Relevant papers were published in the international top journal materials today (DOI: 10.1016 / j.material 2018.10.039) with the title of "a universal method for large-yield and high-concentration fusion of two-dimensional hexagonal boron nitride nanosheets" Hexagonal boron nitride (hBN) is a kind of inorganic ultra wide band gap electronic material with graphite structure The nano chips (hbns) separated from the hBN powder have excellent properties such as ultra wide band gap, high thermal conductivity, high chemistry and thermal stability, and have important application prospects in advanced electronic packaging, high power devices and other fields At present, the stripping methods of hbnns, including ultrasonic stripping, micro mechanical stripping, ball milling stripping and so on, generally have the disadvantages of low efficiency, small concentration or easy pollution, which affect the final application effect The research team found that under the critical reaction condition of high-pressure hydrothermal kettle, by selecting polar solvent matching with the stripping energy of hBN and high-speed agitation, the micron sized bulk materials can be peeled into two-dimensional hbns with atomic layer thickness by using the lithium-ion intercalation assisted hydrothermal stripping method The yield is as high as 55%, and the concentration of hbns dispersion solution reaches 4.13 mg / ml Through AFM and Raman characterization, the team found that the thickness of hbnns was within 10 atomic layers At the same time, the research team also applied this stripping method to the preparation of other common two-dimensional materials, and successfully obtained graphene and molybdenum disulfide nano sheets with a thickness of 1-3 nm So far, the research team has developed a general and effective method based on hydrothermal stripping to prepare two-dimensional nano materials The first author is Dr Wang Ning, advanced materials center, and Shenzhen Advanced Institute is the first unit of the paper This paper has been supported by the major research project of the Ministry of science and technology, the advanced electronic packaging materials Engineering Laboratory of the United Nations and the local government, the pilot project of the Chinese Academy of Sciences, the Key Laboratory of Guangdong Province, the production university research project of Guangdong Province, and the SIAT cas-cuhk high density electronic packaging and device laboratory project.