Hattab, Hichem; N'Diaye, Alpha T.; Wall, Dirk; Jnawali, Giriraj; Coraux, Johann; Busse, Carsten; van Gastel, Raoul; Poelsema, Bene; Michely, Thomas; Meyer zu Heringdorf, Frank; Horn-von Hoegen, Michael:

Growth temperature dependent graphene alignment on Ir(111)

In: Applied Physics Letters, Jg. 98 (2011) ; Nr. 14, S. 141903 (3p)
ISSN: 1077-3118, 0003-6951
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
The 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.