Growth temperature dependent graphene alignment on Ir(111)
2011; American Institute of Physics; Volume: 98; Issue: 14 Linguagem: Inglês
10.1063/1.3548546
ISSN1520-8842
AutoresH. Hattab, Alpha T. N’Diaye, Dirk Wall, Giriraj Jnawali, Johann Coraux, Carsten Busse, Raoul van Gastel, Bene Poelsema, Thomas Michely, F.‐J. Meyer zu Heringdorf, M. Horn‐von Hoegen,
Tópico(s)Surface and Thin Film Phenomena
ResumoThe morphology of graphene monolayers on Ir(111) prepared by thermal decomposition of ethylene between 1000 and 1530 K was studied with high resolution low energy electron diffraction. In addition to a well-oriented epitaxial phase, randomly oriented domains are observed for growth temperatures between 1255 and 1460 K. For rotational angles of ±3° around 30° these domains lock-in in a 30° oriented epitaxial phase. Below 1200 K the graphene layer exhibits high disorder and structural disintegrity. Above 1500 K the clear moiré spots reflect graphene in a single orientation epitaxial incommensurate phase.
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