Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 40: Oxides and insulators

O 40.7: Talk

Thursday, March 30, 2006, 16:30–16:45, WIL A317

Formation and splitting of paired hydroxyl groups on reduced TiO₂(110) — •Stefan Wendt, Jesper Matthiesen, Renald Schaub, Ebbe K. Vestergaard, Erik Laegsgaard, Flemming Besenbacher, and Bjørk Hammer — Interdisciplinary Nanoscience Center (iNANO)

A combination of high-resolution scanning tunneling microscopy and density functional theory is utilized in order to study the interaction of water with the reduced TiO₂(110)-(1 × 1) surfaces. As the direct product of water dissociation at oxygen vacancies, paired hydroxyl groups are formed. The pairs are immobile and stable at the surface unless they interact with adsorbed water molecules. As a result of these interactions, one proton per paired hydroxyl group is net transferred to the next oxygen row, thereby forming single hydroxyl groups. Furthermore, we find that hydroxyl groups on the bridging oxygen rows facilitate water diffusion in the [110] direction.