Progress in the research of 2D-2D ultra-thin heterojunction in Shenzhen Advanced Institute

Recently, the research center of nano regulation and biomechanics, Institute of medical engineering, Shenzhen Institute of advanced technology, Chinese Academy of Sciences has made new progress in the research of 2D-2D ultra-thin heterojunction Relevant achievements were published in Journal of the American Chemical Society (DOI: 10.1021 / JACS 9b08651) under the title of "from one to two: in situ construction of an ultra 2D-2D closure bonded junction from a single phase monolayer nanosheet" Dr Xing Zheng of science and technology of Israel, Associate Professor Hu Jun of Northwest University and associate researcher Ma Ming of Shenzhen Advanced Institute jointly wrote the article, and Professor Yang Shihe of Shenzhen Graduate School of Peking University and researcher Li Jiangyu of Shenzhen Advanced Institute were the corresponding authors of the article Up to now, the synthesis and preparation of nano materials have been precisely controlled in their composition, size and morphology, and various nano level preparation methods have been ingeniously developed to realize the preparation and synthesis of materials such as plasma, metal nanoparticles, metal chalcogenide quantum dots and multi-component nano particles At the same time, with the maturity of the preparation technology and means, the atomic scale preparation of nano materials can be realized by using the wet chemical synthesis method, including two-dimensional nano films with atomic wire and atomic thickness, such as graphene, transition metal dihalide (TMD) and transition metal oxide Researchers all over the world have tried to build 2D-2D ultra-thin heterostructure by wet chemical method, but up to now, 2D-2D composite still needs more complex preparation process and usually shows weak interface bonding state, so reasonable design idea and simple and efficient preparation method are the key to achieve 2D-2D ultra-thin heterostructure In this study, a mild chemical synthesis method has been developed to realize the in-situ growth of Bi 2O 2S in a single layer Bi 2WO 6, so as to assemble and prepare ultra-thin two-dimensional heterojunction nanofilms The strong interface bonding in the two-dimensional heterostructure nano chip makes it produce macromolecular like characteristics, which is also the main factor to improve the efficiency of charge carrier separation Compared with the pure Bi 2WO 6 nano sheet, the ultra-thin two-dimensional heterojunction nano sheet achieves more than 4 times photocurrent response, and generates more than 8 times hydrogen in the photocatalytic decomposition water system In addition, the heterojunction can achieve all visible light absorption and shift the photoanode initial potential to a more negative direction This method is also expected to be applied to other bismuth containing materials, including Bi 2O 2CO 3, Bi oxyhalide (bio I, bio BR, etc.), oxygen sulfur compounds containing [Bi 2O 2], etc., which is of great significance for the development of advanced catalysts, batteries and energy converters.