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O: Fachverband Oberflächenphysik

O 63: Oxides and Insulator Surfaces: Adsorption and Reaction of Small Molecules II

O 63.8: Vortrag

Mittwoch, 19. März 2025, 12:15–12:30, H25

New insights into CO adsorption on TiO₂(110): Enhanced IRAS characterisation — •Nail Barama, Moritz Eder, Igor Sokolović, Michele Reticcioli, David Rath, Michael Schmid, Ulrike Diebold, Jiri Pavelec, and Gareth Parkinson — Institute of Applied Physics, TU Wien, 1050 Vienna, Austria

TiO₂(110) serves as a model system for investigating surface reactivity and catalytic behavior, with CO adsorption commonly employed as a probe molecule. While previous IR spectroscopy studies identified two distinct adsorption sites for low coverages, regular Ti sites, and Ti sites near oxygen vacancies[1,2], recent work based on DFT and microscopy suggests the existence of additional adsorption configurations influenced by the polaronic nature of the substrate[3]. In this contribution, we present experimental results obtained using our custom-built reactivity and infrared reflection absorption spectroscopy (IRAS) setup[4]. This design, optimized for detecting small concentrations of adsorbates on metal oxide surfaces, delivers high-resolution spectra with a high signal-to-noise ratio, allowing us to observe new features. Our data reveal multiple CO adsorption configurations on TiO₂(110), which agrees with STM observations from a recent study[3]. References: [1] Xu, M. et al. Angew. Chem. Int. Ed. 51, 4731-4734 (2012). [2] Petrik, N. G. & Kimmel, G. A. J. Phys. Chem. Lett. 3, 3425-3430 (2012). [3] Reticcioli, M. et al. Phys. Rev. Lett. 122, 016805 (2019). [4] Rath, D. et al. Rev. Sci. Instrum. 95, 065106 (2024).

Keywords: Surface physics; Catalysis; IRAS; TiO2