The carbon's solubility into copper is extremely minimal and so largely floor diffusion and nucleation of carbon atoms are included. For this reason as well as the growth kinetics, the graphene thickness is limited to predominantly a monolayer. The massive edge is that the graphene might be grown on Cu https://www.facebook.com/permalink.php?story_fbid=pfbid0Zkff5axPy6uAtu7ed6jL7bBkwRNQEiAdoff9FT6dTCiHjS7GfgNMKvgNrf2mHVSvl&id=61562415773754&__cft__[0]=AZUI90kXm6CF6WoBAoZpB--pN0ExuRPIfNrUipwWeTq75wQFBs2jd06YYlMjt9ypC06o0VzAripYTDyjtQ27LDW2agoiG8cq9hmV7HjUa7VSDgwTmV1UXdtYQdRO6BbQJ9t_ngaTGgccCTSq9QJEAIFpXosT23jashvb28TDuSJZb3q2jvmVkoRA73NDeQQCtly1ns3YbwrOOXRH2-Vp8O-t&__tn__=%2CO%2CP-R