On the Role of Metal Step-Edges in Graphene Growth

Souheil Saadi, Frank Abild-Pedersen, S. Helveg, J. Sehested, Berit Hinnemann, C.C. Appel, Jens Kehlet Nørskov

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Graphene growth on transition metal surfaces is studied by means of density functional theory calculations. The results show that graphene grows preferentially out from surface step edges onto lower facets on fcc and hcp metal surfaces. The results also reveal that an epitaxial lattice match between graphene and the metal step-edge stabilizes graphene and lowers the corresponding critical graphene nucleus size. In the case of a graphene-metal lattice mismatch, a destabilization of the critical graphene nucleus size may be compensated by tuning the carbon chemical potential. The concepts of metal-graphene lattice and carbon chemical potential are included in a simple growth model that describes experimental trends in graphene formation at different metal surfaces under varying growth conditions.
Original languageEnglish
JournalJournal of Physical Chemistry Part C: Nanomaterials and Interfaces
Volume114
Issue number25
Pages (from-to)11221-11227
ISSN1932-7447
DOIs
Publication statusPublished - 2010

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