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Raman Spectrum of Graphene and Graphene Layers

2006; American Physical Society; Volume: 97; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.97.187401

1092-0145

Andrea C. Ferrari, Jannik C. Meyer, Vittorio Scardaci, Cinzia Casiraghi, Michele Lazzeri, Francesco Mauri, S. Piscanec, Da Jiang, Kostya S. Novoselov, S. Roth, A. K. Geǐm,

Carbon Nanotubes in Composites

Graphene is the two-dimensional building block for carbon allotropes of every other dimensionality. We show that its electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers. The $D$ peak second order changes in shape, width, and position for an increasing number of layers, reflecting the change in the electron bands via a double resonant Raman process. The $G$ peak slightly down-shifts. This allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.