Unveiling the Direct Correlation between the CVD-Grown Graphene and the Growth Template

Figure 2

(a) Schematic of copper pretreatment process via nitric acid. The surface roughness of copper increases with longer acid treatment time. SEM images of surface morphologies of (b) pristine copper and (c–e) after various acid treatment conditions.

(a)

(b)

(c)

(d)

(e)