The carbon's solubility into copper is extremely minimal and for that reason generally surface diffusion and nucleation of carbon atoms are involved. Because of this and the growth kinetics, the graphene thickness is restricted to predominantly a monolayer. The large benefit is that the graphene may be developed on Cu https://www.facebook.com/permalink.php?story_fbid=pfbid02mUVuZyHHdsh31rc8QsVrjH8s8mCuDJY6Lw317V5Rd75nxtVxEzGN7wVRzjCWvPR6l&id=61562415773754&__cft__[0]=AZUgoi40qiHqUdNfu5xFFbpgmG4s-jUPQPuoxG93CgHPtdyozagjwjbxXZSAuG0bwLAFXJSHJY7i3N9isrOXqSB6OBywDfOVCbxOrFh5RJPSjwyLyFCQLaigCmMzjsfxmE1lAY4d4BRGbVSikU74V3q3fY8aBKO-z4yTSjTT60ugrMisI4STOvAOI6BH2Fr8V7zOnSwtN7GODIACt-2dXaV_&__tn__=%2CO%2CP-R