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Imaging atomic-level random walk of a point defect in graphene

Author

Listed:
  • Jani Kotakoski

    (Faculty of Physics, University of Vienna
    University of Helsinki)

  • Clemens Mangler

    (Faculty of Physics, University of Vienna)

  • Jannik C. Meyer

    (Faculty of Physics, University of Vienna)

Abstract

Deviations from the perfect atomic arrangements in crystals play an important role in affecting their properties. Similarly, diffusion of such deviations is behind many microstructural changes in solids. However, observation of point defect diffusion is hindered both by the difficulties related to direct imaging of non-periodic structures and by the timescales involved in the diffusion process. Here, instead of imaging thermal diffusion, we stimulate and follow the migration of a divacancy through graphene lattice using a scanning transmission electron microscope operated at 60 kV. The beam-activated process happens on a timescale that allows us to capture a significant part of the structural transformations and trajectory of the defect. The low voltage combined with ultra-high vacuum conditions ensure that the defect remains stable over long image sequences, which allows us for the first time to directly follow the diffusion of a point defect in a crystalline material.

Suggested Citation

  • Jani Kotakoski & Clemens Mangler & Jannik C. Meyer, 2014. "Imaging atomic-level random walk of a point defect in graphene," Nature Communications, Nature, vol. 5(1), pages 1-5, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4991
    DOI: 10.1038/ncomms4991
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