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

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

2009-04-08

arxiv.org/abs/0904.1251v2

Physical Review B Volume: 80 Issue: 8 Article Number: 085430 Published: AUG 2009

Physics

Condensed Matter

Materials Science

Missing figure caption 7 added. Small revisions to manuscript based on journal reviewer comments. Title changed to better desc

Scientific paper

10.1103/PhysRevB.80.085430

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, 18.5 and 30 degrees with respect to the most common variant. The about 30-degree-rotated structure is also studied by STM. We propose that all 4 variants are moire structures that can be classified using simple geometric rules involving periodic and quasi-periodic 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.

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