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BAQIS Quantum Science Forum 29: On Surface Assembly of Conjugated Metal-Organic Coordination Frameworks
2020/12/28
Time: 14:00-15:00
Abstract: Metal–organic coordination structures are materials in which reticular metal centers and organic linkers bind with each other via metal–ligand coordination interaction. 2D metal-organic (or porous coordination) frameworks have attracted tremendous attention in the last two decades owing to their unique electronic, topological, magnetic properties. These properties of 2D metal-organic frameworks suggest many potential applications of the materials, for instance, they might be promising candidates to build functional molecular devices. However, the fabrication of single layers of 2D metal-organic frameworks remains a great challenge. In this regard, synthesizing conjugated organic monolayer with unique properties is highly desirable.
This report focuses on the fabrication of 2D metal–organic coordination structures through on-surface synthesis on Au(111), Cu(111) and Ag(111) substrates. We design and synthesize five conjugated 2D metal-organic frameworks which comprise a Kagome lattice of coordinated metal atoms. We used scanning tunneling microscopy (STM) as an experimental tool and density-functional theory (DFT) as a theoretical tool to characterize the electronic, topological, magnetic properties of the networks at a single-molecular level. These studies may contribute to the development of low-dimensional conjugated metal-organic materials.
Dr. Gao obtained his bachelor’s degree at Southern University of Science and Technology (SUSTech) as the first generation of graduates in 2015, and obtained his PhD degree at Hong Kong University of Science and Technology (HKUST), Physics department in Prof. Nian Lin’s group in 2020.
Dr. Gao’s research interest is design and synthesis of 2D metal-organic quantum materials by using scanning tunneling microscope (STM) and molecular beam epitaxy (MBE) technology. One of the highlights of his research work is, for the first time, he and the coauthors used an on-surface assembly protocol to synthesize a single layer of a two-dimensional conjugated network (Ni3(HITP)2) on a Au(111) surface. This work demonstrates that single layer 2D metal-organic frameworks adsorbed on surfaces are a new class of 2D materials that host quantum phases.