Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Organic Molecules at Surfaces 2: Characterization of Organic Monolayers
O 12.11: Vortrag
Montag, 5. September 2022, 17:30–17:45, S051
Adsorption of Submonolayer Coverages of Phenylphosphonic Acid on Rutile TiO2(110) — •Alexander Wolfram1, Maximilian Muth1, Julia Köbl1, Nataliya Tsud2, Sascha Mehl3, Hans-Peter Steinrück1, and Ole Lytken1 — 1Friedrich-Alexander Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie 2, Egerlandstr. 3, 91058 Erlangen, GER — 2Charles University, Faculty, of Mathematics and Physics, Department of Surface and Plasma Science, Holešovičkách 2, Prague, 18000, Czech Republic — 3Elettra-Sincrotrone Trieste SCpA, Strada Statale 14, km 163.5, Trieste, Basovizza, 34149, Italy
The interfaces of oxide surfaces with organic molecules are crucial for the performance of devices, such as dye-sensitized solar cells, sensors and organic electronics. All these devices contain interfaces where organic molecules are bound to surfaces, often using covalent anchoring groups. These anchoring groups strongly influence the interface and thus the device performance. An interesting anchoring group is the phosphonic acid group, which is well known to bind strongly to oxide surfaces. At ELETTRA sinchrotrone in Trieste we investigated submonolayer coverages of phenylphosphonic acid on a rutile TiO2 (110) surface with high-resolution X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Based on the changes in the O 1s and P 2p core levels, we are able to identify the different binding motifs present on the surface at different temperatures, while the NEXAFS intensities gives us information about the orientation of the phenyl moiety.