Two-dimensional metal-organic framework (MOF) films are porous crystalline materials formed by coordination bonds between metal ions and organic ligands. Because of its high specific surface area, stable chemical structure and adjustable physical and chemical properties, it has broad application prospects in the fields of catalysis, energy, gas separation, biomedicine, chemical sensing and other fields. Currently, there are still challenges in preparing high-quality large-area two-dimensional MOF films.
Chen Jianyi and Liu Yunqi, researchers in the Organic Solids Laboratory of the Institute of Chemistry, Chinese Academy of Sciences, used coordination chemical reactions to prepare high-quality two-dimensional organic frame material films. In the previous work (Mater. Chem. Front. 2020, 4, 243), researchers used exahydroxytriphenylene (HHTP) as the molecular building element, using chemical vapor deposition technology, through a solid-solid reaction, A Cu3(HHTP)2 MOF film was grown on the surface of the copper foil.
Recently, the research team proposed a charge induction mechanism and used electrochemical methods to prepare large-area uniform Cu3(HHTP)2, Cu3(BTPA)2, Cu2(MTCP) and Cu3(TBTC) on the surface of single crystal copper. ) 2 MOF film. In this method, an external voltage is applied to make the ligand ion migrate to the anode and undergo a coordination reaction with the dissociated Cu2+. After low-voltage induced nucleation and epitaxial growth, high-quality MOF films can be deposited directly on the surface of the copper anode. On this basis, the research uses polymethyl methacrylate transfer technology to realize the transfer of MOF film from the surface of copper foil to any substrate. The film has high crystal quality, and the conductivity can reach 0.087 S cm-1, which is three orders of magnitude higher than that reported in the literature.
Doctoral student Liu Youxing is the first author of the paper, and Chen Jianyi and Liu Yunqi are the corresponding authors of the paper. Related results were published on Angewandte Chemie International Edition (2021, 60(6), 2887-2891). The research work is supported by the Chinese Academy of Sciences' Strategic Leading Science and Technology Special (Category B) "Function-oriented Frontier Scientific Issues of Atomic Manufacturing".
Electrochemical preparation of large-area two-dimensional Cu3(HHTP)2 MOF thin films
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