Figure 2From: Thinning and functionalization of few-layer graphene sheets by CF4 plasma treatmentRaman spectra of graphene sheets before and after CF 4 plasma 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.Back to article page