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O: Fachverband Oberflächenphysik
O 81: Oxide and Insulator Surfaces: Adsorption II
O 81.5: Vortrag
Mittwoch, 22. März 2017, 17:00–17:15, WIL C107
Temperature-dependent reactions of Phthalic Acid on Co3O4(111) — •Daniel Wechsler, Matthias Franke, Quratulain Tariq, Hans-Peter Steinrück, and Ole Lytken — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, 91058 Erlangen, Egerlandstraße 3, Germany
Understanding the bonding between organic molecules and metal-oxide surfaces plays an important role in many nanotechnology devices. Functional groups, like -COOH, can act as linkers to attach molecules to surfaces in a controlled manner.
Using synchrotron-radiation X-ray photoelectron spectroscopy and temperature programmed desorption we have followed the adsorption and reactions of phthalic acid, a model system with two carboxylic acid linker groups, with Co3O4(111) as a function of coverage and temperature. Upon annealing from 105 to 800 K, three different temperature regions have been identified. They were assigned to intact phthalic acid, a carboxylate species forming at 350 K and finally thermal composition beginning at 750 K. Near-edge X-ray absorption fine structure measurements confirm an upright-standing adsorption geometry of the carboxylate species.
The project is supported by the DFG through FOR 1878 (funCOS).