Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 76: Nanostructures at surfaces: Wires, tubes
O 76.9: Talk
Thursday, March 25, 2010, 17:00–17:15, H38
Production and electrical properties of nanostructures on graphite surfaces — •Lukas Patryarcha1, Stefan Balk1, Karl Bauer1, Axel Rudzinski2, Lars Bruchhaus2, and Heinz Hövel1 — 1TU Dortmund, Experimentelle Physik I — 2Raith GmbH, Dortmund
A Focused Ion Beam (FIB) of Ga+ ions with 25 keV kinetic energy was used to produce defects in a graphite (HOPG) crystal up to a depth of about 50 nm. Subsequently carbon atoms at the defect positions were oxidized in an Ar/O2 atmosphere and released from the bulk. Using the ionLiNE FIB instrument (Raith GmbH) bars with different width, length and artificial breaks at different positions were isolated from the surrounding crystal and investigated with STM and AFM. The current distribution in the conductive bars was simulated by an array of discrete resistors. The results of the simulations are planned to be compared to a four tip nanoprobe experiment. Nanostructures with specific electrical properties can be designed on HOPG surfaces if the current distribution is localized sufficiently to the bars.