Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 53: Solid / liquid interfaces III
O 53.3: Vortrag
Mittwoch, 16. März 2011, 15:30–15:45, WIL C107
Self-organized Porphyrin monolayers on iodine-modified noble metal surfaces — •Michael Schneider1, Thomaz Kosmala2, and Klaus Wandelt1,2,3 — 1Institut für Physikalische Chemie und Theoretische Chemie, University of Bonn, Wegelerstr. 12 D-53115, Bonn, Germany — 2Institute of Experimental Physics, University of Wroclaw, Maxa Barna 9, 50-204, Wroclav, Poland — 3Department of Physics, University of Rome Tor Vergata, Via Delle Ricerca Scientifica 1, 00133 Rome, Italy
In the field of template chemistry, new and interesting phenomena can be discovered at noble metal /electrolyte interfaces in the presence of anions and molecules as function of electrode potential. The spontaneous self-assembly of organic molecules is considered a promising *bottom-up* technique in nanotechnology to create surface patterns and electronic devices. Porphyrins, for example, are important organic compounds for potential applications in cancer therapy, or as catalysts and sensors. Halide-modified noble metal surfaces are suitable substrates due to their long range order. Moreover, iodide anion layers on Au(111)-surfaces show electrocompression and phase transitions depending on the electrode potential.
Our studies with in-situ STM and cyclic voltammetry not only reproduce previous works about Tetra(N-methyl-4-pyridyl)-porphyrin molecules (TMPyP) on iodide-modified gold and copper surfaces, but firstly reveal new TMPyP phases on gold not previously described, and secondly are extended to bimetallic Cu/Au surfaces providing new template properties.