Figure 3.

Raman spectra of different area of the AB bilayer ribbon. One is extracted from the bottom, the second from the middle of the ribbon. The bottom part of the ribbon exhibits a double G peak that can correspond to a different doping level between the top and bottom graphene sheet.

Tiberj et al. Nanoscale Research Letters 2011 6:478   doi:10.1186/1556-276X-6-478
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