Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Oxide and Insulator Surfaces II

O 58.6: Vortrag

Mittwoch, 2. April 2014, 17:15–17:30, PHY C 213

IRRAS on Metal Oxide Single Crystals: First Experiments on ZnO(10-10) — Maria Buchholz, •Fabian Bebensee, Peter G. Weidler, Alexei Nefedov, and Christof Wöll — Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany

Due to the low reflectivity in the infrared regime of oxides, Infrared Reflection Absorption Spectroscopy (IRRAS) studies on molecules adsorbed on metal oxide single crystals have remained elusive until recently. Furthermore, the fact that the classic surface selection rule for IRRAS does not apply on dielectrics renders the data analysis in such experiments rather difficult. Here, we present the first experiments on adsorption of molecules on zinc oxide (ZnO) single crystals. We demonstrate the great potential this technique offers for the study of such adsorbate systems emerging from consideration of all three components of the incident polarized light separately [1]. We find that carbon dioxide adsorption results in a tridentate (surface) carbonate [2] oriented along the [0001] direction. Comparing these data recorded on single crystalline ZnO to nanoparticles provides useful insights into the role of defects for the surface chemistry of powder particles.

[1] M. Buchholz, P. G. Weidler, F. Bebensee and C. Wöll, Physical Chemistry Chemical Physics, 2013, DOI:10.1039/C1033CP54643H.

[2] Y. Wang, R. Kováčik, B. Meyer, K. Kotsis, D. Stodt et al., Angewandte Chemie International Edition, 2007, 46, 5624-5627.