Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 72.4: Poster

Mittwoch, 19. März 2025, 18:00–20:00, P2

Plasmon assisted catalysis of Ferricyanide by Gold-Nanoparticles with different sizes and light intensities. — •Kyra Peikert, Wouter Koopman, and Matias Bargheer — Institut für Astronomie und Physik Universität Potsdam, Potsdam, Deutschland

In recent years plasmonic catalysis emerged as promising new field in photocatalysis. However, to improve its efficiency, a better understanding of its governing principles is required. In this study we investigate the reaction kinetics of the light driven reduction of ferricyanide catalyzed by gold nanoparticles of different sizes. To refill the holes generated by electron transfer to ferricyanide the hole scavenger Ethanol (EtOH) is added to the solution. We compare this situation to reactions in a purely aqueous solution. The kinetics under different light intensities including dark conditions help to understand the mechanisms. The results show indications of a charging effect of the particles due to the presence of the hole scavenger, which speeds up the reaction rate.

Keywords: Plasmonic; size dependency; Ferricyanid; electron transfer