Continuity of graphene on polycrystalline copper

摘要: The atomic structure of graphene on polycrystalline copper substrates has been studied using scanning tunneling microscopy. overlayer maintains a continuous pristine over atomically flat planes, monatomic steps, edges, and vertices the surface. We find that facets different identities are overgrown with graphene’s perfect carbon honeycomb lattice. Our observations suggest growth models including stagnant catalytic surface do not apply to copper. Contrary current expectations, these results reveal macroscopic is limited by underlying structure.