期刊
SCIENTIFIC REPORTS
卷 4, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep04630
关键词
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资金
- National Research Foundation (NRF) [2011-0013461, 2011-0017605]
- Center for Advanced Soft Electronics under the Global Frontier Research Program of MSIP
- Korean government (MSIP) [2011-0013461, 2011-0017605, 2011-0031630]
- National Research Foundation of Korea [2011-0013461, 2011-0017605, 2011-0031630] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The dependence of the Raman spectrum on the excitation energy has been investigated for ABA- and ABC-stacked few-layer graphene in order to establish the fingerprint of the stacking order and the number of layers, which affect the transport and optical properties of few-layer graphene. Five different excitation sources with energies of 1.96, 2.33, 2.41, 2.54 and 2.81 eV were used. The position and the line shape of the Raman 2D, G*, N, M, and other combination modes show dependence on the excitation energy as well as the stacking order and the thickness. One can unambiguously determine the stacking order and the thickness by comparing the 2D band spectra measured with 2 different excitation energies or by carefully comparing weaker combination Raman modes such as N, M, or LOLA modes. The criteria for unambiguous determination of the stacking order and the number of layers up to 5 layers are established.
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