Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 6: Nanostrukturen I

O 6.5: Vortrag

Montag, 24. März 2003, 12:15–12:30, M\"UL/ELCH

Locally reconfigurable arrays of supramolecular nanowires — •Ferdinand Jamitzky^1,2, Thomas Markert^2,3, Frank Trixler¹, Axel Gross³, and Wolfgang Heckl¹ — ¹LMU München — ²MPE Garching — ³TU München

Nanoelectronic devices made of semiconductor and polymer nanowires, carbon nanotubes and single molecules have been realised in principle by applying crystallisation chain polymerisation and other bottom-up fabrication strategies. A powerful alternative to these strategies is the self-organisation of molecular building blocks into supramolecular architectures, such as surface-supported chains. Applied to semiconducting materials, this strategy allows going beyond simple miniaturising electronics, if the potential of supramolecular chemistry, including reversibility and various self-processes (e.g. self-contacting), can be tapped. However, this requires the ability to repeatedly and locally control self-organisation at the nanometre scale, which remains a challenge so far. Here we present a simple and rapid preparation method under ambient conditions which enables the controlled self-organisation of Quinacridone (QAC) molecules at a solid-smectic interface into supramolecular nanowires. We demonstrate that orientation and length of the wires can be repeatedly reconfigured on a nanometre scale and that the self-reconnecting tendency of previously cut wires can be used to induce assembly of user-defined arrangements. This opens up a way for the fabrication of controllable dynamic molecular electronic and optoelectronic nanodevices.