Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.58: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
Interaction of N2O with TiO2 and ZnO Surfaces Studied by IR Spectroscopy — •Max Kauer1, Heshmat Noei2, Martin Muhler2, Karina Morgenstern1, and Yuemin Wang1, 2 — 1Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, D-44780 Bochum — 2Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, D-44780 Bochum
Metal oxides have recently attracted enormous attention because of their important applications in a variety of fields such as catalysis, chemical sensors, solar cells, and electronic devices. We investigated the adsorption of N2O on rutile TiO2(110) and ZnO(10-10) single crystal surfaces by UHV-FTIR spectroscopy. The high-quality IR data demonstrates that exposing both, TiO2 and ZnO to N2O at 120 K leads to molecular adsorption in a linear configuration. However, the binding energy of N2O on ZnO(10-10) is much higher than that on TiO2(110). It was found that N2O is bound to surface Ti4+ ions on TiO2(110) via its O-end, while it prefers to adsorb via its N-end at surface Zn2+ ions on ZnO(10-10). Our results reveal that the N2O adsorption on oxide surfaces is structure-sensitive. The experimental data will be further discussed based on theoretical calculations.