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O: Fachverband Oberflächenphysik

O 68: Polymeric biomolecular films

O 68.6: Talk

Thursday, March 17, 2011, 12:30–12:45, WIL B122

Vibrational spectroscopy of organic monolayers by sum-frequency generation — •Jan Weber, Raissa Mongo, Thorsten Balgar, and Eckart Hasselbrink — Fakultät für Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany

Organic monolayers display an interesting field of surface science because of their diverse characteristics. Prominent examples are siloxanes on silica surfaces which are stable under ambient conditions. These self-assembled monolayers have been of interest since the 1980’s yet the mechanisms of ordering, degredation or adsorption of other molecules is not fully understood on the molecular scale. In this context we analyze Octadecyltrichlorosilane (OTS) and Aminopropylmethoxysilane (APS) with regard to orientationally ordering and thermally induced degradation mechanisms.

The experiments are carried out via sum-frequency generation (SFG) spectroscopy by using a picosecond laser system, which provides visible light as well as tunable infrared light. SFG spectroscopy is a convenient method because it provides a very high surface sensitivity for the analysis.