Defects of graphene on Ir(111): Rotational domains and ridges

By E. Loginova, S. Nie, K. Thurmer, N. Bartelt, K. Mccarty. 2009

172 citations recorded by the source corpus.

We use low-energy electron microscopy (LEEM), low-energy electron diffraction (LEED), and scanning tunneling microscopy (STM) to study different orientations of single-layer graphene sheets on Ir(111). The most-abundant orientation has previously been characterized in the literature. Using selective-area LEED we find three other variants, which are rotated $14\ifmmode^\circ\else\textdegree\fi{}$, $18.5\ifmmode^\circ\else\textdegree\fi{}$, and $30\ifmmode^\circ\else\textdegree\fi{}$ with respect to the most common variant. The $\ensuremath{\sim}30\ifmmode^\circ\else\textdegree\fi{}$-rotated structure is also studied by STM. We propose that all four variants are moir\'e structures that can be classified using simple geometric rules involving periodic and quasiperiodic structural motifs. In addition, LEEM reveals that linear defects form in the graphene sheets during cooling from the synthesis temperature. STM shows that these defects are ridges, suggesting that the graphene sheets delaminate locally as the Ir substrate contracts.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/fe292880651ee121608cc8910efb3b142a410ec0

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In Materials Chemistry

  1. H. Tetlow
  2. Dimitri D. Vvedensky
  3. Ian J. Ford
  4. J. Coraux
  5. J. Boer
  6. L. Kantorovich
  7. M. Batzill

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