Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.62: Poster
Monday, February 25, 2008, 18:30–19:30, Poster F
Self-selection and Error Correction in Multi-ligand Supramolecular Networks at Surfaces — •Steven L. Tait1, Alexander Langner1, Nian Lin1, Chandrasekar Rajadurai2, Mario Ruben2, and Klaus Kern1,3 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart — 2Forschungszentrum Karlsruhe GmbH — 3Ecole Polytechnique Fédérale de Lausanne, Switzerland
Supramolecular networks stabilized by metal--organic coordination can be designed to self-organize in regular, two-dimensional lattices at surfaces, whose dimensions and properties can be controlled by selection of the organic ligand components. This approach offers a natural and highly efficient alternative to current nano-fabrication methods and provides a model system for (bio-)molecular assembly. With high-resolution scanning tunneling microscopy of such networks, we demonstrate structural error correction during assembly achieved by active molecular self-selection. Experiments were made by deposition of Fe atoms and organic ligands at the Cu(100) surface. Binary mixtures of complementary ligands allow for constructions of highly-ordered 2D arrays of compartments, whose shape and size can be predictably programmed by modular ligand replacement. Redundant mixtures of ligands of different sizes demonstrate the ability of the system to correct structural errors and achieve a high degree of order by sorting themselves into rows according to molecule size. We contrast this with a ligand mixture where the energy landscape of the intermolecular interactions does not activate an error correction mechanism, but rather provides a route for structural error tolerance.