SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster Session II: Solid-liquid interfaces: Reactions and electrochemistry I
O 21.2: Poster
Montag, 1. März 2021, 13:30–15:30, P
Interaction of Small Alcohols with TiO2 studied by Vibrational Sum Frequency Spectroscopy — •Anupam Bera, Denise Bullert, and Eckart Hasselbrink — Fakultät für Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany
The interaction of alcohols with oxide surfaces such as TiO2 attracts interest as the oxidation of these species is of large industrial relevance. The interaction of TiO2 with alcohols has attracted less interest although oxidation of the latter is of large industrial relevance.Surface-sensitive vibrational sum frequency spectroscopy (vSFS) has been utilised to study the adsorption chemistry of small alcohols namely methanol, ethanol, 1-propanol and 2-propanol on TiO2 thin films under vapour pressure conditions at which a condensed molecular film is maintained. The vSF spectra in the C-H region reveal that methanol and ethanol adsorb both molecularly and dissociatively, while 1-propanol and 2-propanol are solely detected in molecular form. The different adsorption behaviour suggests that the extend of dissociation decreases from methanol to propanol. Moreover, polarisation analysis of the spectra reveals that the methyl groups are preferentially oriented with their symmetry axis pointing in a direction close to the surface normal for methanol, ethanol and 1-propanol. That seems not to be the case for 2-propanol.