Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 65: Graphene V
O 65.6: Talk
Thursday, March 29, 2012, 11:45–12:00, MA 041
Freely spanned graphene membranes from epitaxal graphene — •Daniel Waldmann1, Johannes Jobst1, Konrad Ullmann1, Felix Fromm2, Sebastian Bauer3, Benjamin Butz4, Jan Englert5, Thomas Seyller2, Patirk Schmuki3, Erdman Spieker4, and Heiko Weber1 — 1Lehrstuhl für Angewandte Physik, Universität Erlangen-Nürnberg — 2Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg — 3Lehrstuhl für Korrosion und Oberflächentechnik, Universität Erlangen-Nürnberg — 4Center for Nanoanalysis and Electron Microscopy, Universität Erlangen-Nürnberg — 5Zentralinstitut für Neue Materialien und Prozesstechnik, Universität Erlangen-Nürnberg, Germany
We developed a fabrication process for freestanding graphene membranes from high-quality epitaxial graphene on silicon carbide (SiC) by electrochemical removal of the SiC. The membranes with areas up to 700 µm2 are freely spanned over holes in the substrate. Thus we can perform measurements on epitaxial graphene without the disturbing influence of the substrate. The homogeneity is controlled by scanning electron microscopy and scanning transmission electron microscopy. Raman measurements display a strongly enhanced signal of the membranes compared to epitaxial graphene on substrate. Using high resolution transmission electron microscopy we imaged the graphene membranes with atomic resolution.