The carbon's solubility into copper is extremely small and thus mostly floor diffusion and nucleation of carbon atoms are included. For this reason along with the growth kinetics, the graphene thickness is limited to predominantly a monolayer. The big gain is that the graphene could be grown on Cu foil https://www.facebook.com/permalink.php?story_fbid=pfbid0pJKGgRvVTsfTCtJ5tak6SUJ5ymgDetxzjcgW6kEiTpAqgHasCi2doykziDdLBxVBl&id=61562415773754&__cft__[0]=AZV964PfkhTubvAMf2bTV1XhNBUUD2Vg-F7bLhy7GWl7zj1onQbBObHNkuvws4QUTstxSG8tJHvPu2i75NOHj9zgd4OHn0QvWLuR3-J-NN5qO5GluG5mTMBNXNvy_sY_CHjeRzSU_LGsDLKF1cvaLTMLq1lm8qe6o41LucAUqCX9nVZpW4UxcRu-y78djF1vwg_u3f2vPQpMFB3Au-4_Ovry&__tn__=%2CO%2CP-R