2D Transition Metal Dichalcogenides, 2D Polymer and 2D Perovskites

讲座名称: 2D Transition Metal Dichalcogenides, 2D Polymer and 2D Perovskites
讲座时间 2018-10-13
讲座地点 化工学院办公楼 106 会议室
讲座人 LOH Kian Ping
讲座内容
讲座题目:2D Transition Metal Dichalcogenides, 2D Polymer and 2D Perovskites
讲座地点:化工学院办公楼 106 会议室
讲座时间:2018.10.13 (星期六)上午 10:30
报告人:LOH Kian Ping教授,新加坡国立大学
邀请人:唐伟 教授 化工学院
讲座内容:
Post-graphene discovery, there have been much research interests in 2-D transition metal dichalcodenide (TMDC) materials due to its layer-dependent band gap and valley-selectable optical and spin properties. However the problem of large area, scalable growth has to be addressed for research in TMDC to be sustainable. I will show the progress made in my team with regards to the large area growth of 2-D transition metal chalcogenides on low cost substrate such as glass, as well as wafer scale growth on hexagonal BN using Molecular Beam Epitaxy. High resolution TEM studies were carried out to look at grain boundary migration in TMDCs.
Going from 2D inorganic materials to 2D organic materials, the synthesis of graphene-like, conjugated aromatic 2D polymer is one of the greatest challenges in synthetic chemistry. We have successfully synthesized a crystalline 2D conjugated aromatic polymer (2D-CAP) by topochemical polymerization of a molecular crystal based on C-C coupling between adjacent monomers. 2DCAP crystalline polymer has a layered stacking structure and can be readily exfoliated into ultrathin sheets. 2DCAP also has highly ordered porosity (pore size 6 Å) created by the stacking of slightly slipped 2D-CAP sheets. Due to its intrasheet conjugation and ordered open 1D channels, 2D-CAP exhibits good cycle stability and rate capability when applied as an anode in an ambient temperature sodium battery cell. When applied as an asymmetric supercapacitor, it delivers a specific capacitance of 233 F g-1 at a current density of 1.0 A g-1 with outstanding cycle performance. The solid-state C-C coupling polymerization approach presented here opens a new avenue for constructing novel 2D polymers with highly regular porosity and chemical stability, which is currently a major challenge in synthetic chemistry.

 

 

讲座人介绍

Kian Ping Loh教授是石墨烯研究领域的国际知名专家,也是新加坡国立大学石墨烯中心的主要发起人之一。鉴于其突出的科研贡献,Loh教授于2013年被授予“ACS Nano Lectureship  Award”,2014年被授予新加坡学术界最高荣誉“President’s Science Award”。目前,Loh教授担任Chemistry of Materials和Diamond and Related Materials的副主编,同时还兼任Advanced Functional Materials, Advanced Optical Materials, 2D-Materials的编委。至今为止,已经发表200余篇SCI论文,包括Nature、 Nat. Mater.Nat. Nanotechnol.Nat. Chem. Nat. EnergyNat. Photo. Nat. Commun. JACSAngew. Chem.Nano lett. Adv. Mater.等。

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