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Real-time observation of epitaxial graphene domain reorientation

Author

Listed:
  • Paul C. Rogge

    (University of California, Berkeley
    Lawrence Berkeley National Laboratory)

  • Konrad Thürmer

    (Sandia National Laboratory)

  • Michael E. Foster

    (Sandia National Laboratory)

  • Kevin F. McCarty

    (Sandia National Laboratory)

  • Oscar D. Dubon

    (University of California, Berkeley
    Lawrence Berkeley National Laboratory)

  • Norman C. Bartelt

    (Sandia National Laboratory)

Abstract

Graphene films grown by vapour deposition tend to be polycrystalline due to the nucleation and growth of islands with different in-plane orientations. Here, using low-energy electron microscopy, we find that micron-sized graphene islands on Ir(111) rotate to a preferred orientation during thermal annealing. We observe three alignment mechanisms: the simultaneous growth of aligned domains and dissolution of rotated domains, that is, ‘ripening’; domain boundary motion within islands; and continuous lattice rotation of entire domains. By measuring the relative growth velocity of domains during ripening, we estimate that the driving force for alignment is on the order of 0.1 meV per C atom and increases with rotation angle. A simple model of the orientation-dependent energy associated with the moiré corrugation of the graphene sheet due to local variations in the graphene–substrate interaction reproduces the results. This work suggests new strategies for improving the van der Waals epitaxy of 2D materials.

Suggested Citation

  • Paul C. Rogge & Konrad Thürmer & Michael E. Foster & Kevin F. McCarty & Oscar D. Dubon & Norman C. Bartelt, 2015. "Real-time observation of epitaxial graphene domain reorientation," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7880
    DOI: 10.1038/ncomms7880
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