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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Nano Lett. 2010 Feb 10;10(2):398–405. doi: 10.1021/nl902741x

Figure 6.

Figure 6

Polarization dependence of D peak before and after electron transfer chemistry. (a) Microscopic image of graphene sheet. The upper part is a single layer. (b) Raman of pristine graphene sheet edge (spot E): D peak depends on the angle of polarization of the incident laser light. Light parallel to the edge is 0° and perpendicular is 90°. The D/G=0.12 for 0° but 0.02 for 90° for edge of pristine sheet. (c) Edge point E after reaction shows weak or no dependence of D peak on the angle of polarization. (d) Point on the bulk of single graphene sheet has a lower D/G than edge and no polarization dependence. Reactions are all performed at 35 °C with 17 mM 4-nitrobenzene diazonium water with 1 wt% SDS.