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MM: Fachverband Metall- und Materialphysik
MM 29: Poster II
MM 29.34: Poster
Tuesday, March 19, 2024, 17:00–19:00, Poster B
Formation and functionalities of self-assembled monolayers on nanoporous gold — •Eva-Maria Steyskal1, Elisabeth Hengge2, Lara Novak1,2, and Roland Würschum1 — 1Institute of Materials Physics, NAWI Graz, Graz University of Technology, Austria — 2Institute of Biotechnology and Biochemical Engineering, NAWI Graz, Graz University of Technology, Austria
Self-assembled monolayers (SAMs) are a popular strategy for surface functionalization of electrodes, yet hardly studied for defect-rich or porous materials. Here we give an overview of our group's systematic work on the SAM-functionalization of nanoporous gold (np-Au) obtained by electrochemical dealloying. Via in-situ resistometry, the different stages of the SAM formation process in the porous structure can be clearly distinguished [1].
As specific examples of SAM functionalities, we demonstrate electrochemical controllability of the surface charge [2], which is even superior on np-Au compared to planar electrodes, as well as a sensing application, namely the detection of fluoride ions in water [3], which relies on a SAM with a boronic acid functional group.
This work was financially supported by the Lead Project (LP-03) Porous Materials @ Work for Sustainability at TU Graz as well as the Austrian Science Fund FWF (P36409).
[1] E. Hengge et al., Beilstein J. Nanotechnol., 2019, 10, 2275-2279, [2] E. Hengge et al., Phys Chem Chem Phys, 2021, 23, 14457-14464, [3] L. Novak et al., RSC Adv., 2023, 13, 6947-6953
Keywords: nanoporous metals; dealloying; self assembled monolayers; surface functionalization; fluoride sensing