Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Oxide Surfaces: Adsorption and Reactivity
O 14.2: Vortrag
Montag, 16. März 2015, 15:15–15:30, MA 042
The role of defects in the adsorption of CO on Co3O4 — •M.Alexander Schneider1, Pascal Ferstl1, Lutz Hammer1, M.Alif Arman2, Edvin Lundgren2, Jan Knudsen3, Sascha Mehl4, Arafat Toghan4, Yaroslava Lykhach4, and Jörg Libuda4 — 1Solid State Physics, FAU Erlangen-Nürnberg, Germany — 2Division of Synchrotron Radiation Research, Lund University, Sweden — 3The MAX IV Laboratory and Division of Synchrotron Radiation Research, Lund University, Sweden — 4Physical Chemistry II, FAU Erlangen-Nürnberg, Germany
We studied the adsorption of CO on 3 nm thick Co3O4(111) films grown on Ir(100) by means of XPS, IRAS and STM under ultrahigh vacuum conditions. At full saturation of the surface at 100 K both XPS and IRAS suggest that CO is bound in three different configurations. We find two distinctly different adsorption sites in which the molecule is weakly bound and desorbs from Co3O4 well below 300 K. A third stronger bound minority configuration resides at the surface even beyond room temperature. The latter might be related to surface defect sites which are investigated in detail by STM for the clean films. Possible configurations for the weakly bound CO molecules on the Co3O4 surface are also discussed.