title: Gap-mode SERS studies of azobenzene-containing self-assembled monolayers on Au(111).
abstract: Self-assembled monolayers of azobenzene-containing thiols on smooth Au(111) surfaces were studied by gap-mode surface-enhanced Raman spectroscopy (gap-mode SERS). By adsorption of colloidal Au nanoparticles on top of the organic adlayer highly reproducible spectra with strongly enhanced intensities are obtained. The observed bands indicate a trans conformation of the azobenzene moieties and are in agreement with structural data for the molecular layer. A characteristic dependency on the terminal and the spacer groups of the molecules is found. Samples prepared during illumination with UV light show pronounced spectral differences that can be attributed to azobenzene in cis conformation.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 19, 24118 Kiel, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Jung
authors.forename: Mathias
authors.initials: M
authors.lastname: Müller
authors.forename: Norihiro
authors.initials: N
authors.lastname: Fujimoto
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Ikeda
authors.forename: Kohei
authors.initials: K
authors.lastname: Uosaki
authors.forename: Ursula
authors.initials: U
authors.lastname: Cornelissen
authors.forename: Felix
authors.initials: F
authors.lastname: Tuczek
authors.forename: Claudia
authors.initials: C
authors.lastname: Bornholdt
authors.forename: Dordaneh
authors.initials: D
authors.lastname: Zargarani
authors.forename: Rainer
authors.initials: R
authors.lastname: Herges
authors.forename: Olaf
authors.initials: O
authors.lastname: Magnussen