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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Probing carbon isotope effects on the Raman spectra of graphene with different C-13 concentrations

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Title
Probing carbon isotope effects on the Raman spectra of graphene with different C-13 concentrations
Author
Carvalho, Bruno R.Hao, YufengRighi, ArieteRodriguez-Nieva, Joaquin F.Colombo, LuigiRuoff, Rodney S.Pimenta, Marcos A.Fantini, Cristiano
Issue Date
2015-09
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.92, no.12, pp.125406 - 125406
Abstract
A resonance Raman study of graphene samples with different C-13 isotopic concentrations and using different laser excitation energies is presented. The main Raman peaks (D, G, G*, and 2D) of graphene were measured and the dependence of their frequencies on the isotope atomic mass follows a simple harmonic oscillator relation. The G* and 2D double-resonance peak positions were measured as a function of the laser energy, and we observed that the slopes of the laser energy dependence are the same independently of isotope concentration. This result shows that isotopic substitution does not alter the electron and phonon dispersions near the K point of the graphene Brillouin zone. From the linewidth of G and 2D Raman peaks, we have also obtained a dependence of the phonon lifetime on the C-13 isotope concentration
URI
https://scholarworks.unist.ac.kr/handle/201301/17342
URL
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.125406
DOI
10.1103/PhysRevB.92.125406
ISSN
2469-9950
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CHM_Journal Papers
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