The carbon's solubility into copper is extremely reduced and thus primarily 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 massive gain would be that the graphene is usually developed on Cu foil https://www.facebook.com/permalink.php?story_fbid=pfbid02KEf2Bo3roshTT3SjjqwSHMjto3SwFFbcnU6jaawi2YjV2CziSPF5oVf5zeKdwVoBl&id=61562415773754&__cft__[0]=AZWt-L_QtJpVnodXuS_hhTx_0SDBFEeqoFa1vjvJ-fHB_m5TnGbC1iQ0Zv5cBiGSFH2G72_ola1Z1IJcTHQR1hifeS8mZW3-qqeJEwyt_YCo-EZgaQ-WC63s2EwlrXwext9JQux1O-qQ5bA5KE--AwHFLS4opeiK8F9NEs4KHXFFSVBuNLqjFaVx2QXO1yJq15q-vlXvj6LaF9eyZe0cizzk&__tn__=%2CO%2CP-R