Direct Observation of "pac-Man" Coarsening

X. X. Yu, A. Gulec, A. Yoon, J. M. Zuo, P. W. Voorhees, L. D. Marks

Research output: Contribution to journalArticlepeer-review


We report direct observation of a "Pac-Man" like coarsening mechanism of a self-supporting thin film of nickel oxide. The ultrathin film has an intrinsic morphological instability due to surface stress leading to the development of local thicker regions at step edges. Density functional theory calculations and continuum modeling of the elastic instability support the model for the process.

Original languageEnglish (US)
Pages (from-to)4661-4664
Number of pages4
JournalNano letters
Issue number8
StatePublished - Aug 9 2017


  • Oxide
  • coarsening
  • environmental TEM
  • in situ
  • thin film

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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