Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Tuesday: Nanostructures
O 41.6: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
Aromatic self-assembled monolayers as protective layer for silver SERS substrates — •Martha Frey1, Christof Neumann1, Maria Küllmer1, Susanne Pahlow2, Andreas Winter1, Martin Jahn2, Uwe Hübner2, Dana Cialla-May2, Karina Weber2, Jürgen Popp1,2, and Andrey Turchanin1 — 1Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743 Jena, Germany — 2Leibniz Institute of Photonic Technology, Member of the Leibniz Research Alliance Leibniz Health Technology, 07745 Jena, Germany
Surface enhanced Raman spectroscopy (SERS) is an established technique for specific detection of fingerprint spectra of molecules at lowest concentrations. In particular, the application of silver-based SERS substrates is promising due to their favorable physical properties for enhancing Raman signals. However, the silver substrates may deteriorate with time due to oxidation. Here we present a study on preventing these unwanted changes by passivating the SERS substrates with aromatic self-assembled monolayers (SAMs). We prepare the SAMs in UHV and characterize them in situ by X-ray photoelectron spectroscopy (XPS) and ex situ by SERS. After exposing these samples for several months to ambient conditions, we conducted a comparative study by both techniques. Furthermore, we characterized the samples by scanning electron microscopy (SEM). We show an enhanced stability of the passivated substrates in comparison to the bare substrates. The presence of functional groups in the SAMs leads towards specific biochemical functionalization of the SERS substrates.