Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Graphene: Preparation and Characterization I (jointly with HL, MA and TT)
O 68.11: Talk
Thursday, March 14, 2013, 13:00–13:15, H17
Epitaxial graphene nanoflakes on Au(111): Structure, electronic properties and manipulation — •Mikhail Fonin1, Philipp Leicht1, Lukas Zielke1, Elena Voloshina2, and Yuriy S. Dedkov3 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Institut für Chemie und Biochemie - Physikalische und Theoretische Chemie, Freie Universität Berlin, 14195 Berlin, Germany — 3SPECS Surface Nano Analysis GmbH, 13355 Berlin, Germany
Graphene nanoribbons and graphene dots have been proposed to exhibit such peculiar phenomena like localized edge states or edge magnetism. The aim of the present study is the investigation of structural and electronic properties of epitaxial graphene nanoflakes on the Au(111) surface.
Upon in situ preparation, we observe a formation of two types of nanoflakes, which are either embedded in the gold surface or sit directly on top of Au(111). In all cases, flakes reveal a moiré contrast, which is modulated by the herring-bone reconstruction of the Au(111) surface with the moiré period depending on the orientation of the graphene sheet in relation to the substrate. We show that quasi-free-standing graphene nanoflakes can be easily manipulated by the STM tip regardless of the flake size. The details of the structure and electronic properites of such quasi-free-standing flakes are discussed upon comparison with graphene dots on Ir(111).