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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.16: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

SFM manipulation techniques applied to graphene — •Stefan Eilers, Tobias Liebig, and Jürgen P. Rabe — Humboldt-Universität zu Berlin

The properties of graphene render it a promising candidate for future generation electronic devices. For the investigation of properties and possible applications or devices structuring and manipulation techniques are needed. Thinness, flexibility and flatness make it possible to apply SFM techniques to single or multilayer graphene well known from using with molecules on graphite. Here, some effects produced by a SFM tip are demonstrated. First, manipulation of graphene itself is shown, in detail sawing were a gap and a nanoribbon is produced and manipulating parts of graphene without destruction. In both cases the manipulation is started on SiO2 substrate and kept in contact with it while moving the SFM tip. It appears that the graphene can only be desorbed and turned when the manipulation is done near an edge of graphene or when the graphene piece is small enough because there the adsorption force between graphene and the substrate is smaller than the force to breake the bonds in graphene. Second, adsorption and manipulation of DNA on an amphiphile interlayer is presented. The interlayer is needed to make sure that the DNA is mobile enough to be manipulated. It appears that a force can be found large enough to manipulate DNA but to small to damage the graphene.