SKM 2023 – scientific programme
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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.32: Poster
Wednesday, March 29, 2023, 17:00–19:00, P3
Dynamics of the response of thiol monolayers to rapid heating — •Matthias Linke and Eckart Hasselbrink — Universität Duisburg-Essen, 45141 Essen, Germany
Energy transport between metal substrates and molecules as well as intramolecular energy transport between vibrations is still not well understood, even though systems such as thiols on gold were studied extensively. Self-assembled molecular films are an ideal model system such as their characterization attracted much interest over the last decades, especially in the field of nanotechnology. It is well established that thiols adsorb easily and reproducibly on gold substrates by self-assembly. Sum-frequency generation vibrational spectroscopy (SFGvS) can be used for characterization of such systems, since it is inherently sensitive to surface species, interfaces at which centrosymmetry is broken. We adsorbed different thiols on Au-surfaces and heated the substrate by focussing an additional 25 ps 532 nm laser beam on the backside of the sample. Absorption of the photons leads to temperature jumps in the metal which can be assessed by tracking the reflectivity changes of the sample. Tracking the spectral changes via SFGvS at different delays between the pump and probe pulses can be done to assess the temperature effects induced in the substrate and the molecules and time constants can be extracted. The effect of the probing of different head groups (NO2, CN, CH3) and variation of the spacer group are studied in this work.