Div. of Synchrotron Radiation Research


H. Over, A.P. Seitsonen, E. Lundgren, M. Schmid and P. Varga
Experimental and simulated STM images of stoichiometric and partially reduced RuO2(110) surfaces including adsorbates.
Surf. Sci. 515 (2002) 143.

We present experimental and DFT-simulated STM images of ultrathin RuO2(1 1 0) films on Ru(0 0 0 1), including adsorbates such as oxygen and CO. We are able to identify the under-coordinated O atoms on the RuO2(1 1 0) surface with STM, i.e. the bridging O atoms and the on-top O atoms. The partial reduction of the RuO2(1 1 0) surface by CO exposure at room temperature leads to a surface where part of the bridging O atoms have been removed and some of the vacancies are occupied by bridging CO. When dosing 10 L of CO at room temperature, the RuO2(1 1 0) surface becomes fully mildly reduced in that all bridging O atoms are replaced by bridging CO molecules. Annealing the surface to 600 K produces holes on the terraces of such a mildly reduced RuO2(1 1 0) surface. These pits are not generated by the recombination of lattice O with CO, but rather these pits are assigned to a complex temperature-induced rearrangement of surface atoms in the topmost RuO2 double layer of RuO2(1 1 0). With this process the bridging O atoms are again populated and surplus Ru atoms agglomerate in small islands at the rims of the holes.

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