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2017.10.13 13:27

[Fri. 13 Oct. 2017] Dr. J. Nathan Hohman/The Molecular Foundry, Lawrence Berkeley National Laboratory, California, USA

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Speaker Dr. J. Nathan Hohman
Date Fri. 13 Oct. 2017
Time 5:00pm
Venue #331, Asan Hall, College of Science

“Engineering Quantum Confinement 

in Metal-Organic Chalcogenide Assemblies (MOCHA)”

 

When 2D monolayers are abstracted from layered materials, new properties—and opportunities—emerge. In the archetypical example of the layered transition metal dichalcogenide MoS­2, there is a change from an indirect band gap in the bulk to a direct band gap in the monolayer. This change in the light-matter interaction has been the source of much attention for luminescent, photovoltaic, catalytic, spintronic, and other applications utilizing 2D materials. However, building devices out of such ultrathin materials poses a variety of technical challenges: considerable effort must be expended to ensure isolation of stable monolayers, post-synthetic modification and doping is challenging, and integration into devices can alter the unique properties enabled by the ultrathin structure. As a route towards solving these challenges, we employ a hybrid chemical approach that combines organic and inorganic constituents in a single material: metal-organic chalcogenide assemblies (MOCHA). By employing organic ligands as a structural and functional elements of a hybrid coordination polymer, we are able to achieve 3D crystalline assemblies of 2D monolayers that are quantum confined in their as-synthesized bulk state. Here, we will demonstrate the synthetic flexibility of the MOCHA system, show how ligand identity controls the transition between 1D, 2D, and 3D coordination polymer systems, and introduce how new techniques in crystal growth and design can be employed to achieve new opportunities for manipulating the optoelectronic properties of low-dimensional material systems.

 

 Dr. J. Nathan Hohman

The Molecular Foundry, Lawrence Berkeley National Laboratory, California, USA


List of Articles
No. Subject Speaker Date
Notice Fall semester 2017 Seminar Schedule file - -
48 Fall semester 2016 Seminar Schedule file - -
47 Spring semester 2017 Seminar Schedule file - -
46 [Fri. 17 Mar. 2017] 9th RINS Symposium file - Fri. 17 Mar. 2017
45 [Thu. 27 Apr. 2017] Seminar was canceled! - -
44 [Wed. 5 July. 2017] Seminar is canceled! - -
43 7th Jilin-Korea-Waseda Alliance Annual Symposium file - August 17 ~ 19, 2017
42 [October 10, 2017] Novel Terahertz Spectroscopies file Director Mischa Bonn Tue, October 10, 2017
41 [October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences Dr. Byung-Kuk Yoo October 25, 2017
» [Fri. 13 Oct. 2017] Dr. J. Nathan Hohman/The Molecular Foundry, Lawrence Berkeley National Laboratory, California, USA Dr. J. Nathan Hohman Fri. 13 Oct. 2017
39 [Thu. 26 Oct. 2017] Dr. Jung-Nyoung Heo/Center for Medicinal Chemistry Research, Korea Research Institute of Chemical Technology, Daejeon, Korea Dr. Jung-Nyoung Heo Thu. 26 Oct. 2017
38 [Thu. 13 Apr. 2017] Dr. Wan Ki Bae/Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul, Korea Dr. Wan Ki Bae Thu. 13 Apr. 2017
37 [Mon. 13 Oct. 2016] Prof. Amir H. Hoveyda/Multicomponent Catalytic Synthesis of Organoboron Compounds for Scalable Natural Product Synthesis Prof. Amir H. Hoveyda Monday 13 October 2016
36 [Thu. 11 May. 2017] Prof. Andreas Heinrich/IBS Research, Center for Quantum Nanoscience, Seoul, South Korea Prof. Andreas Heinrich Thu. 11 May. 2017
35 [Thu. 22 Sep. 2016] Prof. Anna Lee/Organocatalyzed Asymmetric Reactions Prof. Anna Lee Thursday 22 September 2016
34 [Thu. 20 Oct. 2016] Prof. Chan Hyuk Kim/Novel Small Molecule-based Approaches for Cancer Immunotherapy Prof. Chan Hyuk Kim Thursday 20 October 2016
33 [Thu. 14 Sep. 2017] Prof. Dokyoung Kim/Department of Anatomy and Neurobiology, Kyung Hee University, Seoul Prof. Dokyoung Kim Thu. 14 Sep. 2017
32 [Thu. 28 Sep. 2017] Prof. Eunsung Lee/Department of Chemistry, POSTECH and Center for Self–assembly and Complexity, Institute for Basic Science (IBS), Pohang, Republic of Korea Prof. Eunsung Lee Thu. 28 Sep. 2017
31 [Thu. 16 Nov. 2017] Prof. Hyungjun Kim/Department of Chemistry, and Graduate school of Energy, Environment, Water, and Sustainability (EEWS), KAIST, Daejeon, Korea Prof. Hyungjun Kim Thu. 16 Nov. 2017
30 [Fri. 30 Oct. 2017] Prof. Igor Rodin/Department of Chemistry, Moscow State University, Moscow, Russia Prof. Igor Rodin Fri. 30 Oct. 201
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