Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
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 42.97: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
In-situ investigations of adsorbed benzene on silver modified Pt(322) surfaces — •Sandra Künzel1, Matthias Schöppke1, Regine Streber2, Michael Peter Andreas Lorenz2, Hans-Peter Steinrück2, and Reinhard Denecke1 — 1Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnestraße 2, 04103 Leipzig — 2Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen
In a previous study the site-specific adsorption of benzene on Ni(111) has been investigated by in-situ x-ray photoelectron spectroscopy (XPS) [1]. In an attempt to study lateral confinement on the adsorption properties of larger molecules, we applied such detailed analysis of C 1s core levels (excited by synchrotron radiation at BESSY II) to benzene adsorption on stepped Pt(322). The effective terrace width was modified from five atomic rows to zero by different amounts of Ag (from 0.2 to 1 ML) deposited at 300 K, which form monatomic rows along the step edges [2]. Adsorption of benzene on clean Pt(322) at 190 to 300 K yields only a single C 1s peak with no indication of specific step related adsorption. Increasing amounts of Ag result in a monotonous decrease of benzene adsorption at 300 K (no adsorption on Ag). Since complete site blocking was already observed for Ag coverages exceeding 0.6 ML (i.e. three monorows), a horizontal adsorption geometry and, thus, a minimum free Pt area required can be proposed.
This work was supported by BMBF (05 ES3XBA/5).
[1] C. Papp et al., Phys. Rev. B 73 (2006) 235426.
[2] P. Gambardella et al., Phys. Rev. B 61 (2000) 2254.