Fig. 3.

Schematic illustration of the cvdG growth process on a carbon-soluble metal support (Ni) where the hydrocarbon molecules, e.g., methane, decompose and the C atoms diffuse into the bulk of the metal. The C atoms segregate upon supersaturation, nucleate, and grow a carbon layer (a). On a Cu substrate, the hydrocarbons decompose as carbon poorly segregates in copper. The adsorbed adatoms migrate along the surface, nucleate, and form the graphene layer (b). As depicted in detail by Muñoz and Gómez-Aleixandre [52]