Raman Spectrum of Graphene and Graphene Layers

We show that graphene’s electronic structure is uniquely captured in its Raman spectrum that clearly evolves with increasing number of layers

A. C. Ferrari

2006

Scholarcy highlights

  • PACS numbers: The current interest in graphene can be attributed to three main reasons
  • Graphene layers only become visible when deposited on the top of oxidized Si substrates with a finely tuned thickness of the oxide layer because, in this case, even a monolayer adds to the optical path of reflected light to change the interference color with respect to the empty substrate
  • Raman fingerprints for single, bi- and few-layers reflect changes in the electronic structure and allow unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area
  • To provide the most definitive identification of single and bi-layer graphene we perform Transmission Electron Microscopy on some of the samples to be measured by Raman spectroscopy
  • A HR-TEM analysis of foldings at the edges or within the free hanging sheets gives the number of layers by direct visualization, since at a folding the sheet is locally parallel to the beam, Fig. 1(b-e)
  • The measurements are performed at room temperature with a Renishaw spectrometer at 514 and 633 nm
  • Raman fingerprints for single-, bi- and few-layer graphene reflect changes in the electronic structure and electron-phonon interactions and allow unambiguous, high-throughput, nondestructive identification of graphene layers

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