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O: Fachverband Oberflächenphysik
O 109: Heterogeneous Catalysis on Metal Oxides
O 109.6: Vortrag
Donnerstag, 19. März 2020, 16:15–16:30, TRE Phy
Sum frequency spectroscopy on the surface of semiconductors — •Denise Franziska Bullert, Anupam Bera, and Eckart Hasselbrink — Universität Duisburg-Essen, Universitätsstr. 5, 45117 Essen, Germany
Titanium dioxide (TiO2) is a versatile material with important applications in environmental purification. Therefore it gained much attention over the last decades. Recently the understanding of adsorbed organic molecules on TiO2 has made much progress. But little is known about catalytic processes under near-ambient conditions. With a home-made compact cell and the application of sum frequency generation vibrational spectroscopy (SFG-VS) it was possible to address this problem for the first step of a catalytic process. SFG-VS is a powerful method to investigate the chemical identity and structure of adsorbates. Vibrational spectra of adsorbed short-chained alcohols such as methanol (MeOH), ethanol (EtOH) and isopropanol (iPrOH) could be recorded under room temperature and low vacuum conditions. For MeOH and EtOH it was revealed that the molecular species as well as dissociated species are present. In contrast for iPrOH the related spectra show only the molecular species on the surface of the catalyst. The next promising step would be to follow the reaction pathway of catalytically transferred short-chained alcohols under near-ambient conditions. Those kind of studies are also covered by applying SFG-VS because it allows for in-situ spectroscopy.