Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 30: Poster: Organic Thin Films and Thin Oxides
DS 30.6: Poster
Wednesday, March 18, 2020, 15:00–18:00, P1A
Sum-frequency generation vibrational spectroscopy of nHexadencanethiol on oxidised zinc — •Robert Rameker, Detlef Diesing, and Eckart Hasselbrink — Universität Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany
Due to its interesting electronic properties, self-assembled organic monolayers are frequently investigated in semiconductor technology for the production of electrodes with tailor made electronic properties. Vibrational sum frequency spectroscopy (vSFS) is a powerful method for characterization of interfaces. From 2800 cm−1 to 3100 cm−1, symmetric and antisymmetric vibrational modes of the methyl- and methylene groups were observed. Thermal and electrochemical methods were tried to make zinc oxide, which is a semiconductor with a band gap of 3.3 eV, from zinc by oxidation. A better vibronic signature of the adsorbed molecule is obtained for highly oxidised zinc substrates. X-ray photoelectron spectroscopy was used to quantify the coverage with organic molecules and to gain information about the binding between the organic molecules and the metal oxide surface. For characterisation, electrochemical impedance spectroscopy (EIS) is an important method to analyze anticorrosion effects in different electrolytes.