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2017.11.27 10:25

[Thu. 30 Nov. 2017] Prof. Sunmin Ryu/Department of Chemistry, POSTECH, Pohang, South Korea

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Speaker Prof. Sunmin Ryu
Date Thu. 30 Nov. 2017
Time 5:00pm
Venue #331, Asan Hall, College of Science

Surface Science of 2-Dimensional Crystals Probed by Optical Spectroscopy

 

Two-dimensional crystals (2DX) represented by graphene hold substantial potentials both in fundamental research and industrial applications owing to novel electronic and optical properties enabled by dimensional confinement. In addition, their intrinsic properties are readily manipulated by chemical entities in direct contact because of their high fraction of surface atoms. To uncover and control emerging properties, my group has explored surface and interfacial science of low dimensional materials and developed optimized spectroscopic methods. In particular, Raman spectroscopy has proven to be a versatile analytical probe because of the varying spectral features for different thickness, stacking, defect density, charge density, mechanical strain, temperature, etc. Such multimodal sensitivity, however, turns into difficulty when multiple unknown variables are to be determined simultaneously. In this talk, I will explain that the effects of strain and charges in graphene can be optically separated from each other by correlation analysis of the two modes, enabling simple quantification of both. Employing the analysis, I will present our recent findings on important surface scientific problems in 2-dimension such as structural deformation caused by substrates and thermal perturbation, interfacial charge transfer, and molecular diffusion through 2DX-substrate interface.

 

References

1.      J. E. Lee, G. Ahn, J. Shim, Y. S. Lee, and S. Ryu,* “Optical Separation of Mechanical Strain from Charge Doping in Graphene”, Nature Commun. 3, 1024 (2012) 

2.      J. Shim, C. H. Lui, T. Y. Ko, Y.-J. Yu, P. Kim, T. F. Heinz, and S. Ryu,* “Water-Gated Charge Doping of Graphene Induced by Mica Substrates”, Nano Lett. 12, 648 (2012) 

3.      D. Lee, G. Ahn and S. Ryu,* “Two-Dimensional Water Diffusion at a Graphene-Silica Interface”, J. Am. Chem. Soc. 136, 6634 (2014) 

 

 

 


List of Articles
No. Subject Speaker Date
Notice Fall semester 2017 Seminar Schedule file - -
9 [October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences Dr. Byung-Kuk Yoo October 25, 2017
8 [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
7 [October 31, 2017] New ways of vision: Protein structures in translational medicine and business development, my experience file Prof. Robert Huber(1988 Nobel Prize in Chemistry) October 31, 2017
6 [Fri. 30 Oct. 2017] Prof. Igor Rodin/Department of Chemistry, Moscow State University, Moscow, Russia Prof. Igor Rodin Fri. 30 Oct. 201
5 [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
4 [November 14, 2017] Zero-Point Energy, Fluctuations, and Dissipation : A (Mostly) Quantum-Optical Perspective Prof. Milonni, Peter November 14, 2017
3 [Thu. 23 Nov. 2017] Prof. Sung-Gon Kim/Department of Chemistry, Kyonggi University, Suwon, Korea Prof. Sung-Gon Kim Thu. 23 Nov. 2017
» [Thu. 30 Nov. 2017] Prof. Sunmin Ryu/Department of Chemistry, POSTECH, Pohang, South Korea Prof. Sunmin Ryu Thu. 30 Nov. 2017
1 [January 24, 2018] Electro-Optic Organic THz Wave Sources file Prof. O-Pil Kwon(Ajou University) January 24, 2018 (Wednesday)
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