Raman spectroscopy of graphene edges.
By Cinzia Casiraghi, A. Hartschuh, H. Qian, S. Piscanec, C. Georgi, A. Fasoli, K. Novoselov, D. Basko, Andrea C. Ferrari. Nano letters (Print), 2008
974 citations recorded by the source corpus.
Graphene edges are of particular interest since their orientation determines the electronic properties. Here we present a detailed Raman investigation of graphene flakes with edges oriented at different crystallographic directions. We also develop a real space theory for Raman scattering to analyze the general case of disordered edges. The position, width, and intensity of G and D peaks are studied as a function of the incident light polarization. The D-band is strongest for polarization parallel to the edge and minimum for perpendicular. Raman mapping shows that the D peak is localized in proximity of the edge. For ideal edges, the D peak is zero for zigzag orientation and large for armchair, allowing in principle the use of Raman spectroscopy as a sensitive tool for edge orientation. However, for real samples, the D to G ratio does not always show a significant dependence on edge orientation. Thus, even though edges can appear macroscopically smooth and oriented at well-defined angles, they are not necessarily microscopically ordered.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/b897fe7d97a50eef35f7865aceb6fe96923ddc66
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In Materials Chemistry
- A. Jorio
- Zhipei Sun
- Andrea C. Ferrari
- Tawfique Hasan
- Edmund J. R. Kelleher
- Zhenhua Ni
- Francesco Bonaccorso
- F. Torrisi
Citations in the corpus
- Graphene mode-locked ultrafast laser. (2009, background): “We rather assign it to the edges of the submicrometer flakes we produce.(29) We note that the 2D band, although broader than in pristine graphene,(25) is still fitted by a single Lorentzian line shape.”
- Monolayer graphene as a saturable absorber in a mode-locked laser (2010, background): “Figure 1(c) shows that the graphene surface contains many wrinkle-like defects, which are responsible for the strong D band [19] in the corresponding Raman spectrum in Fig.”