Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.34: Poster

Dienstag, 2. April 2019, 17:00–20:00, Poster E

Sum-frequency generation vibrational spectroscopy of 4-Nitrothiophenole and 4-Aminothiophenole adsorbed on gold surfaces — •Matthias Linke, Damian Firla, and Eckart Hasselbrink — Universität Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany

Self-assembled molecular films and their characterization has attracted much interest over the last decades, especially in the field of nanotechnology. The application of such films relies on controlling of their topological as well as their chemical properties. An extensively studied system consists of gold as a substrate and thiol molecules as the molecular layer which is formed easily by self-assembly. Sum-frequency generation vibrational spectroscopy (SFGVS) is a useful tool for characterization of surfaces. Different vibrational modes could be observed although the ones of aromatic compounds in the range of 1200 to 1650 cm⁻¹ typically show only moderate IR- and/or Raman-activity which both are a necessity for SFGVS. 4-Nitrothiophenole (NTP) and 4-Aminothiophenole (ATP), which differ in the substituent and the electronic effects caused by these, have been adsorbed on gold surfaces and studied by SFGVS. The ring mode 8a and the symmetrical stretching mode for the NO₂-group for NTP and the mode 19a for ATP have been observed and were used to characterize the layers.