Figure 3From: Thinning and functionalization of few-layer graphene sheets by CF4 plasma treatmentRaman spectra of plasma-thinned few-layer graphene sheets with different thicknesses. The three spectra were collected from three different spots respectively. The positions of the three spots are labeled in the inset optical image of a sample subjected to 5 s of CF4 plasma treatment. Scale bar, 5 μm.Back to article page