The carbon's solubility into copper is incredibly very low and therefore mostly floor diffusion and nucleation of carbon atoms are involved. For that reason along with the growth kinetics, the graphene thickness is restricted to predominantly a monolayer. The massive gain is that the graphene is usually developed on Cu https://www.facebook.com/permalink.php?story_fbid=pfbid0cBYku2ZfZsKExwQysMwxQWVLaaRzxn6KPz9DG8JCCiARFBfPQ8jcWQvzafLHRNEbl&id=61562415773754&__cft__[0]=AZUKzhYoPBYu64Arap6YU-1EI46p7zf3k7wgPFokdYD8_yypNsu3Q-if0gUjm5fTqbKRKbrZ0DPzi81dJnCtfoYj1YeG3b87rN_0sf5o2Uv2B7L4B58QiOKa31VTSZrlu3thAXA10m_Bd2hgpScXTk4bPC0ZSqrKO2asF_sJhTbKavJyLcszJL1hWdfejqyFlOcEKhyzOvSFGhOXXFo8Z57v&__tn__=%2CO%2CP-R