Figure 2
In-situ UV absorption spectroscopy and characterization of a standard CVD growth. (a) Time evolution of the absorbance spectra and (b) line profiles of the 220 nm (black) and 256 nm absorption peaks (red), with the dotted lines at 60 s and 150 s denoting when H2 and CH4 are introduced, respectively. (c) SEM image of the corresponding growth (scale bar 10 µm). (d,e) Raman maps of a single graphene grain on copper (d) I(2D)/I(G) ratio and (e) I(D)/I(G) ratio. Scale bars in (d) and (e) are 5 µm.
