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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.49: Poster

Wednesday, March 16, 2011, 17:30–21:00, P4

Graphene and graphene nanodots on Ir(111) — •Andreas Zusan¹, Philipp Leicht¹, Muriel Sicot¹, Mikhail Fonin¹, Yuriy S. Dedkov², and Karsten Horn² — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz — ²Fritz-Haber-Institut der Max-Planck Gesellschaft, 14195 Berlin

The investigation of the electronic properties of graphene nanostructures is one of the most fundamental requirement on the route towards graphene based nanoelectronics. Within these studies a weak chemical bonding between the carbon monolayer and the substrate is required. For this purpose we used an Ir(111) substrate for the preparation of quasi-freestanding graphene and graphene nanodots by the decomposition of hydrocarbons. The topographic properties as well as the local electronic properties were studied by means of scanning tunneling microscopy and scanning tunneling spectroscopy. The nanodots exhibit a typical size of about 15 to 25 nm and show the well known Moiré superstructure. The edges of the nanodots are predominantly running along the main crystallographic directions of the Ir(111) substrate and the edge structure was determined to be of a zigzag type.