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O: Fachverband Oberflächenphysik

O 72: Poster: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales

O 72.6: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster D

Azobenzene derivatives in the vicinity of Cobalt islands on a gold surface — •Bensu Günay, Christophe Nacci, and Leonhard Grill — Chemistry department, University of Graz, Graz, Austria

The purpose of this study is to investigate whether plasmonic effects can affect the isomerization behavior of molecular switches in the vicinity of cobalt islands on a metallic surface. We have chosen azobenzene derivatives, a prototypical molecular switch, as functional units and an Au(111) surface as substrate, which was studied by low-temperature scanning tunneling microscopy. The combination of these molecules with the gold surface is well known [1] and therefore represents a suitable model system. While in previous studies, switching of the molecules was typically induced by voltage pulses [1], we have induced isomerization here by light. Importantly, Cobalt islands were grown on the surface with the purpose of localized plasmonic effects around these islands. The surface, which was illuminated for different durations at various wavelengths, was then studied in view of different switching rates in the vicinity of the Cobalt islands as compared to remote locations.

[1] M. Alemani et al., JACS 128, 14446 (2006)

Keywords: Plasmonic effect; Azobenzene; Cobalt islands; Scanning Tunneling Microscope