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The European Physical Journal Special Topics

, Volume 148, Issue 1, pp 171–176 | Cite as

Raman mapping of a single-layer to double-layer graphene transition

  • D. GrafEmail author
  • F. Molitor
  • K. Ensslin
  • C. Stampfer
  • A. Jungen
  • C. Hierold
  • L. Wirtz
Article

Abstract.

We report on confocal Raman spectroscopy on a few-layer graphene flake. Adjacent single- and double-layer graphene sections allow mapping the transition in vibrational and electronic properties to a second stacked graphene sheet and with it a weak interlayer coupling. Most prominently the width of the D' peak doubles upon going from a single to a double layer, which can be explained within the double-resonant Raman model. The intensities of the G and G' lines decrease at the crossover to a single layer. Contrary to the G' line the G peak position shifts to higher wave numbers, however, not uniformly over the entire section: its frequency fluctuates spatially. The Raman map of the D line intensity shows a non-zero contribution at the boundaries of the flake and the individual sections, which can be attributed either to defects and disorder or to the breakdown of translational symmetry, whereas within the flake no D line signal is detected.

Keywords

European Physical Journal Special Topic Line Intensity Translational Symmetry Highly Orient Pyrolytic Graphite High Wave Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • D. Graf
    • 1
    Email author
  • F. Molitor
    • 1
  • K. Ensslin
    • 1
  • C. Stampfer
    • 2
  • A. Jungen
    • 2
  • C. Hierold
    • 2
  • L. Wirtz
    • 3
  1. 1.Solid State Physics LaboratoryZurichSwitzerland
  2. 2.Micro and Nanosystems, ETH ZurichZurichSwitzerland
  3. 3.Institute for Electronics, Microelectronics, and Nanotechnology (IEMN), CNRS-UMR 8520Villeneuve d'Ascq CedexFrance

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