Gap-mode SERS studies of azobenzene-containing self-assembled monolayers on Au(111).
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.
Jung
Ulrich
U
Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 19, 24118 Kiel, Germany.
Müller
Mathias
M
Fujimoto
Norihiro
N
Ikeda
Katsuyoshi
K
Uosaki
Kohei
K
Cornelissen
Ursula
U
Tuczek
Felix
F
Bornholdt
Claudia
C
Zargarani
Dordaneh
D
Herges
Rainer
R
Magnussen
Olaf
O