Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Poster Monday: Organic Molecules on Inorganic Surfaces

O 19.7: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

X-Ray Small Angle In-Situ Study of Porphyrin Adsorption on Stabilized Rutil SurfacesX-Ray Small Angle In-Situ Study of Porphyrin Adsorption on Stabilized Rutil Surfaces — •Klaus Götz, Annemarie Pfnür, and Tobias Unruh — Institute for Crystallography and Structural Physics, Erlangen, Germany

Dye sensitized solar cells (DSSCs) based on TiO2 have been studied as an easy to produce, low-cost alternative to classical semiconductor solar cells with recent efficiencies of up to 13% for a long time [1][2]. We synthesized tunable titania nanoparticles with a diameter of 2-3 nm that are stabilized by oleic acid. Special emphasis of our work is focused on the exchange process of the oleic acid with porphyrins designed for a particular application.

This process is studied using a variation of different x-ray small angle scattering techniques. 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 because of the different scattering lengths for x-rays and neutrons. On the other hand x-ray reflectivity 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 give an overview over the different techniques and their usage in the characterization of the morphology of the produced particles and the ligand exchange from oleic acid to porphyrins.

[1] O'Regan & Grätzel; Nature 353, 737-740 (1991)

[2] Matthew S. et al.; Nat. Chem. 6; 242-247 (2014)