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DS: Fachverband Dünne Schichten
DS 28: Poster: Thin Film Properties: Structure, Morphology and Composition
DS 28.17: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Functionalization of Metal Oxid Surfaces with Porphyrins — •Klaus Götz1,2, Annemarie Prihoda1,2, and Tobias Unruh1,2 — 1Lehrstuhl für Kristallographie und Strukturphysik, Universität Erlangen-Nürnberg, Staudtstr. 3, 91058 Erlangen — 2Interdisziplinäres Zentrum für Nanostrukturierte Filme, Universität Erlangen-Nürnberg, Cauerstr. 3, 91058 Erlangen
Porphyrins are widely studied for their use as catalysts and in dye sensitized solar cells. In these systems the porphyrins are bound to metal oxide surfaces as a functionalizing layer.
We study the binding mechanism in the porphyrin - metal oxide interface on TiO2 and Co3O4. Special emphasis of our work is focused on the exchange process of organic stabilizing molecules with porphyrins.
One method is the combination of small angle x-ray and neutron scattering (SAXS and SANS) experiments. These are well suited to study core/shell systems. X-rays interact mainly with electrons and therefore SAXS yields information about the inorganic core of the nanoparticles. Neutrons on the other hand are very sensitive to hydrogen and therefore SANS is well suited to get information about the organic stabilizer shell.
Additionally, X-ray reflectivity (XRR) measurements can be used to study layered systems on flat substrates. This offers the possibility to study the exchange of oleic acid with porphyrins on TiO2 Wafers as a test system.
The poster will show the complementary methods, focusing on the XRR measurements.