Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Poster Nanostructures at Surfaces
O 49.6: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Au vs. Ag: How Does the Choice of Substrate Influence the Formation of SAMs with Carboxylic Head Groups? — •Verena Müller1, Julian Picker1, Daniel Hüger1, Christof Neumann1, Marco Gruenewald2, and Andrey Turchanin1 — 1Friedrich Schiller University Jena, Institute of Physical Chemistry, Lessingstraße 10, 07743 Jena, Germany — 2Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany
Self-assembled monolayers (SAMs) enable modification of various solid substrates at the molecular level, providing a wide range of applications in nanoscience and nanotechnology, e.g., photonics, organic electronics and biochemical sensing.
In this contribution, we present a systematic investigation of the formation of SAMs with carboxylic head groups (–COOH) on Ag and Au substrates. To this end, we analyze the results for three molecular precursors: a RuII-polypyridine complex photosensitizer, hexadecanoic acid and p-terphenyl-4-carboxylic acid. Complementary surface science characterization methods - including X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), scanning tunneling microscopy (STM) and polarization-modulation infrared reflection absorption spectroscopy (PM-IRRAS) - were employed to confirm the successful SAM formations. The obtained results are utilized to gain insight into the nature of the chemical interaction between the carboxylate and the metal surface.
Keywords: SAM; XPS; LEED; IRRAS; STM