Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 64: Organic Molecules on Inorganic Substrates IV: Adsorption, Growth and Networks
O 64.5: Talk
Wednesday, March 18, 2020, 11:30–11:45, TRE Phy
Wetting of Porphyrin Multilayers on Rutile TiO2(110) — •Elmar Kataev1, Daniel Wechsler1, Federico Williams2, Julia Köbl1, Natalia Tsud3, Kevin Prince4, Hans-Peter Steinrück1, and Ole Lytken1 — 1Friedrich-Alexander University Erlangen-Nürnberg, 91058, Erlangen, — 2Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina — 3Charles University, 116 36, Prague, Czech Republic — 4Sincrotrone Trieste SCpA, Basovizza, Italy
Porphyrin/oxide hybrid materials find widespread applications in catalysis, sensors, organic electronics, and light-harvesting systems. However, molecular-level understanding of the interaction of porphyrins with oxides is missing. Here we report a photoemission study of the coverage- and temperature-dependent multilayer growth of cobalt(II) 5-monocarboxyphenyl-10,15,20-triphenylporphyrins (CoMCTPP) and cobalt(II) tetraphenylporphyrins (CoTPP) on a TiO2(110) surface. We find that CoTPP grows in layer-by-layer mode up to 3 layers, switching its behaviour to 3D growth afterwards. For CoMCTPP, we observe 3D growth directly after completion of the first layer. We describe this behavior by a roughness model consisting of a uniform film with sine-shaped islands on top of it. Subsequent annealing resulted in desorption without major rearrangement of the molecules. We conclude that a carboxylic group reduces the porphyrin mobility due to stronger molecular-substrate and molecular-molecular interactions. Supported by the DFG Research Unit FOR 1878 funCOS.