Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.68: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
SXPS Studies of Porphyrin Adsorption on Copper/Electrolyte Interfaces — •Stephan Breuer1, Duc Thanh Pham1, Gennady Cherkashinin2, Thomas Mayer2, and Klaus Wandelt1 — 1Universität Bonn, Institut für Physikalische und Theoretische Chemie, Wegelerstraße 12, 53115 Bonn — 2Technische Universität Darmstadt, FB Materialwissenschaft, Petersenstraße 23, 64284 Darmstadt
We have studied electrochemically prepared Tetra-(methylpyridinium)-porphyrin (TMPyP) adsorbates on anion precovered copper surfaces by Synchrotron X-ray Photoelectron Spectroscopy (SXPS) at the synchrotron light source BESSY II. In order to correlate existing structural data with the chemical composition of the adsorbate layer we have systematically changed the underlying anion coverage (sulphate, chloride), the substrate symmetry ( Cu(100), Cu(111) ) and the applied potential. In contrast to vapour deposition, electrochemistry offers a pathway to deposit also thermolabile organic molecules. Our studies have revealed that the N1s signal, that indicates the presence of TMPyP on the surface, can be deconvoluted in several signals which are very sensitive to changes of the chemical environmentamd the redox state. As TMPyP counterion we have used tosylate which stabilizes the adsorbate layer.