Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Structure of Solid/Liquid Interfaces I
O 82.4: Vortrag
Donnerstag, 10. März 2016, 11:15–11:30, H6
Adsorption of Organic Molecules on Iron Oxide Model Surfaces in Solution — •Peter Seidel1,2 and Martin Sterrer1,2 — 1Institute für Physik, Unversität Graz, Universitätsplatz 5, 8010 Graz, Österreich — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Deutschland
Single-crystalline oxide thin films supported by metals are a well-accepted class of model system for studying fundamental aspects of oxide surface and thin oxide layer chemistry and physics. In the present contribution, we report on our efforts to expand this model approach to electrochemical studies on well-ordered oxide surfaces. Single-crystalline FeO(111) and Fe3O4(111) films were grown under ultrahigh vacuum (UHV) conditions on a Pt(111) substrate and subsequently transferred into air or brought into contact with aqueous solutions. We have tested the stability of the oxide layers in these environments and characterized their electrochemical properties by cyclic voltammetry. Two different organic compunds (Catechol and Aminophthalic acid) were deposited from solution and investigated by electrochemical and UHV methods. Finally, the surface morphology and potential-dependent surface structure changes were investigated in-situ by electrochemical scanning tunneling microscopy.