Fig. 7: Evolution of graphene coverage with growth time.
From: Self-limited monolayer graphene growth on SiC with propane-hydrogen CVD
a C1s XPS spectra (normalized and shifted with respect to the SiC peak) of graphene samples obtained with different growth times and argon cooling. The graphene peak, and therefore the graphene coverage, is seen to increase up to 4 min of growth. From this growth time, all XPS spectra are almost superimposed up to 15 min, indicating that graphene coverage remains stable. b Average number of graphene layers estimated with Raman spectroscopy (integrated intensity of the G peak normalized to the one of a reference HOPG sample) on the same samples. In accordance with XPS, the average number of graphene layers determined with Raman spectroscopy evolves slowly from 0.94 at 7 min of growth to 1.02 after 15 min.
