Figure 2.

Raman spectra of graphene sheets before and after CF4plasma treatment. ( a) Raman spectra of a single-layer graphene sheet before (lower panel) and after (upper panel) 2 s of CF4 plasma treatment. (b) Raman spectra of a few-layer graphene sheet before (lower panel) and after (upper panel) 5 s of CF4 plasma treatment. A thinning effect is obvious.

Shen et al. Nanoscale Research Letters 2012 7:268   doi:10.1186/1556-276X-7-268
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