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  • 02월 20일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Raman Metrology for Graphene and its Application in Surface Scientific Problems

2014년 2월 24일 16시 56분 36초
MAT2-5 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 15시 : 50분
재료화학 - Two-Dimensional Materials: Graphene, Transition Metal Dichalcogenides, and Others II
저자 및
경희대학교 응용화학과, Korea
Raman spectroscopy has proven to be a versatile analytical tool in graphene research because of the varying spectral features for different thickness, stacking, defect density, charge density (n), mechanical strain (ε), temperature, etc. Such multimodal sensitivity, however, turns into difficulty when multiple unknown variables are to be determined simultaneously. Despite the strain-sensitivity of the Raman G and 2D modes, for example, optical characterization of native strain in graphene on silica substrates has been hampered by excess charges interfering with both modes. In this talk, I will show 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.[1] Additionally, the change in the electronic structure of graphene caused by the van der Waals interaction with hexagonal boron nitride (hBN) substrates can also be optically determined.[2] Employing the proposed analysis, I will address our recent findings on important surface scientific issues of graphene such as structural deformation caused by substrates and thermal perturbation,[1] interfacial charge transfer,[3, 4] and molecular intercalation[5] through graphene-substrate interface.

[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] G. Ahn , H. R. Kim , T. Y. Ko , K. Choi , K. Watanabe , T. Taniguchi , B. H. Hong , and S. Ryu,* “Optical Probing of Electronic Interaction between Graphene and Hexagonal Boron Nitride”, ACS Nano 7, 1533 (2013)
[3] S. Ryu, Li Liu, S. Berciaud, Y.-J. Yu, H. Liu, P. Kim, G. W. Flynn, and L. E. Brus, “Atmospheric Oxygen Binding and Hole Doping in Deformed Graphene on a SiO2 Substrate”, Nano Lett. 10, 4944 (2010)
[4] 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)
[5] D. Lee, G. Ahn and S. Ryu,* “Two-Dimensional Water Diffusion at a Graphene-Silica Janus Interface”, submitted (2013)