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O: Fachverband Oberflächenphysik

O 72: Oxide and Insulator Surfaces: Adsorption I

O 72.1: Vortrag

Mittwoch, 22. März 2017, 10:30–10:45, WIL C107

Detection of Protons on Atomically Defined Cobalt Oxide Thin Films on Ir(100). An Infrared Reflection Absorption Spectroscopy Study of D2O and Deuterated Benzoic Acid on Co3O4(111), CoO(111), CoO(100) on Ir(100) — •Matthias Schwarz, Susanne Mohr, Chantal Hohner, Kristin Werner, Tao Xu, and Jörg Libuda — Lehrstuhl für Physikalische Chemie II Friedrich-Alexander-Universität Erlangen-Nürnberg

We applied infrared reflection adsorption spectroscopy (IRAS) in a comparative surface science model study under ultra-high vacuum (UHV) conditions to investigate the interaction of D2O and deuterated benzoic acid (D-BA) with well-ordered Co3O4(111), CoO(111) and CoO(100) thin films on Ir(100) For both, water and D-BA, nature and thermal stability of the formed surface species are strongly depend on the surface structure. On Co3O4(111), water forms partially dissociated clusters with strongly temperature dependent size and structure. On the oxygen-terminated CoO(111) surface, water can dissociate and bind to defect sites only. On CoO(100) only coordination of molecular water at 200 K is observed. For higher temperatures no protons were found. D-BA forms benzoates on all three surfaces and we could identify the surface OD groups formed in this process. On Co3O4(111) and CoO(111) the protons and the benzoates show a broad distribution of chemical states. In sharp contrast, a well-defined coadsorbate layer consisting of carboxylates and protons is found on CoO(100).