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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 - -
41 [Thu. 26 Oct. 2017] Dr. Jung-Nyoung Heo/Center for Medicinal Chemistry Research, Korea Research Institute of Chemical Technology, Daejeon, Korea new Dr. Jung-Nyoung Heo Thu. 26 Oct. 2017
40 [October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences new Dr. Byung-Kuk Yoo October 25, 2017
39 [Mon. 16 Oct. 2017] Prof. Kirk S. Schanze/Department of Chemistry, University of Texas at San Antonio, Texas, USA Prof. Kirk S. Schanze Mon. 16 Oct. 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
37 [Thu. 12 Oct. 2017] Student Host Colloquium : Versatile Dendrimer-Encapsulated Nanoparticles for Analytical Applications Prof. Joohoon Kim Thu. 12 Oct. 2017
36 [October 10, 2017] Novel Terahertz Spectroscopies file Director Mischa Bonn Tue, October 10, 2017
35 [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
34 [Thu. 14 Sep. 2017] Prof. Dokyoung Kim/Department of Anatomy and Neurobiology, Kyung Hee University, Seoul Prof. Dokyoung Kim Thu. 14 Sep. 2017
33 7th Jilin-Korea-Waseda Alliance Annual Symposium file - August 17 ~ 19, 2017
32 [Wed. 5 July. 2017] Seminar is canceled! - -
31 [Fri. 16 Jun. 2017] Prof. Martin Thuo/Department of Materials Science and Engineering, Iowa State University, USA Prof. Martin Thuo Fri. 16 Jun. 2017
30 [Thu. 8 Jun. 2017] Prof. Won-jin Chung/Department of Chemistry, GIST, Gwangju, Republic of Korea Prof. Won-jin Chung Thu. 8 Jun. 2017
29 [Thu. 1 Jun. 2017] Prof. Jong-Man Kim/Department of Chemical Engineering, Hanyang University, Seoul, Korea Prof. Jong-Man Kim Thu. 1 Jun. 2017
28 [Thu. 25 May. 2017] Prof. Wonsuk Kim/Department of Chemistry and Nano Science, Ewha Womans University, Seoul Prof. Wonsuk Kim Thu. 25 May. 2017
27 [Thu. 18 May. 2017] Student Host Colloquium : 1,1-Bisborylalkane: New Class of Organoboron Compound for the Chemo, Regio and Stereoselective Organic Transformations Prof. Seung Hwan Cho Thu. 18 May. 2017
26 [Thu. 11 May. 2017] Prof. Andreas Heinrich/IBS Research, Center for Quantum Nanoscience, Seoul, South Korea Prof. Andreas Heinrich Thu. 11 May. 2017
25 [Thu. 27 Apr. 2017] Seminar was canceled! - -
24 [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
23 [Thu. 6 Apr. 2017] Prof. Rong-Jie Chein/Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan Prof. Rong-Jie Chein Thu. 6 Apr. 2017
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