Spatially resolved Raman spectroscopy of single- and few-layer graphene.
By D. Graf, F. Molitor, Klaus Ensslin, Christoph Stampfer, A. Jungen. Nano letters (Print), 2006
2,488 citations recorded by the source corpus.
We present Raman spectroscopy measurements on single- and few-layer graphene flakes. By using a scanning confocal approach, we collect spectral data with spatial resolution, which allows us to directly compare Raman images with scanning force micrographs. Single-layer graphene can be distinguished from double- and few-layer by the width of the D' line: the single peak for single-layer graphene splits into different peaks for the double-layer. These findings are explained using the double-resonant Raman model based on ab initio calculations of the electronic structure and of the phonon dispersion. We investigate the D line intensity and find no defects within the flake. A finite D line response originating from the edges can be attributed either to defects or to the breakdown of translational symmetry.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/e414f2eb56f2cfc82589bb1d183cbf0b4643ac23
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In Materials Chemistry
Citations in the corpus
- Electronic properties of graphene in a strong magnetic field (2010, neutral): “(Ferrari et al., 2006; Graf et al., 2007; Gupta et al., 2006; Pisana et al., 2007; Yan et al., 2007)].”
- Anomalies in thickness measurements of graphene and few layer graphite crystals by tapping mode atomic force microscopy (2008, background): “[22] Graf D, Molitor F, Ensslin K, Stampfer C, Jungen A, Hierold C, et al.”
- Raman spectroscopy and imaging of graphene (2008, background): “It is observed in the previous work [39] that the area of the 2D band is almost identical for 1 to 4 layers graphene.”
- Contact and edge effects in graphene devices. (2008, background): “Moreover, the possibility to generate photo-excited carriers in graphene is corroborated by recent Raman and visibility studies revealing the optical absorption of graphene at visible wavelength”