The carbon's solubility into copper is incredibly very low and therefore mostly area diffusion and nucleation of carbon atoms are included. For that reason along with the growth kinetics, the graphene thickness is limited to predominantly a monolayer. The big gain is that the graphene is usually grown on Cu https://www.facebook.com/permalink.php?story_fbid=pfbid035xccZZWoSeKZbLp6rFMzZsGNDQNab15eR85APt4TAi7pnNZbvT6k6XLxikzQPDcHl&id=61562415773754&__cft__[0]=AZW5XYBhl_y0RIJDr8gOuHdRU3nE78QCrQg63YdgwGY8xUVimuxGsKOXlVf0ZtH9PnqNGvHYcVsvfnl95qQt7TO3hI1B-ROspHZ9xSqkz2SM5DPFjU_nmKrGc_GqmAHuwLiJNaDyoHIWF2pBuIJqye0Mc0-JFrLDyH23P69QHJoWEXO2aMDUeA7iXTax3QK8jB_jedaq5lYOwPfdfFEaqbir&__tn__=%2CO%2CP-R