Fig. 2: XPS C1s spectra after conventional cooling.
From: Self-limited monolayer graphene growth on SiC with propane-hydrogen CVD
The samples were obtained with different growth times and conventional cooling. Spectra are normalized and shifted with respect to the SiC peak. The spectra for 11 and 15 min of growth are those of graphene on a buffer layer, as evidenced by the high-energy shoulder due to interface peaks. In contrast, the absence of such a shoulder on the graphene peaks for 2, 4 and 7 min of growth indicates that the graphene/SiC interface is hydrogenated for these samples.
