Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: Graphene IV
O 53.2: Vortrag
Mittwoch, 28. März 2012, 17:00–17:15, MA 041
Graphene and hexagonal Boron Nitride 2D Super Structures Analysed by Scanning Probe Spectroscopy — •Thilo Glatzel1, Sascha Koch1, Shigeki Kawai1, Ernst Meyer1, Sara Barja2, and Enrico Gnecco2 — 1Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland — 2Instituto Madrileño de Estudios Avanzados en Nanociencia n (IMDEA Nanociencia), Cantoblanco, 28049 Madrid, Spain
By high temperature exposure of ethylene or borazine [(HBNH)3] on transition metals between 500-1000∘C under UHV conditions leads to the formation of graphene or a boron nitride monolayer, respectively. A lattice mismatch between the layers and the metal surfaces cause a hexagonal superstructure but while graphene is electrically conducting the boron nitride layer is insulating.
STM measurements showed various imaging contrasts arising from the complicated surface geometry and electronic properties. In our nc-AFM and KPFM experiments the complexity of the superstructures is also frequently observed in the topography as well as in the local contact potential difference. We thoroughgoing investigate the tip-sample interaction by 2D dynamic force spectroscopy at room temperature. From the variations in the resonance frequency of the probing tip in close proximity to the sample and the low dissipation accompanying the tip vibrations an elastic nature of the graphene and boron nitride elevations is concluded.