Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 54: Poster Session - Semiconductor substrates: Adsorption and Reaction of Small Molecules
O 54.1: Poster
Tuesday, March 17, 2020, 18:15–20:00, P2/1OG
Vibrational Sum Frequency Generation Spectroscopy Study for Alcohol Adsorption on TiO2 Thin Film — •Anupam Bera, Denise Bullert, and Eckart Hasselbrink — Fakultät für Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany
The surface chemistry of TiO2 is most intensely studied as it is seen as a prototype system for its photocatalytic properties in particular in the context of water splitting and pollutant degradation. However, the interaction of TiO2 with alcohols has attracted less interest although oxidation of the latter is of large industrial relevance. A thorough understanding of the photochemistry requires the fundamental knowledge of composition, structure of the adsorbed alcohols to TiO2 surface in an ambient alcohol atmosphere at room temperature. However, extracting this important information is the limiting step in the most cases due to the challenges in probing the interfacial molecules at near ambient conditions. To address this limitation, we use vibrational sum frequency generation spectroscopy (vSFS) as it allows to solely detect surface species and discriminates against spurious signals from ambient gas phase. Our present study reveals important adsorption behaviour of the various alcohol (methanol, ethanol and isopropanol) systems on TiO2 anatase nano thin film under ambient condition. A systematic study utilizing various polarizations and pressure combinations, allowing us to unambiguously assign the adsorbed species. Our findings reveal key insights into the initial mechanistic steps towards heterogeneous alcohol oxidiation reactions at near ambient condition.