Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 34: Solid-Liquid Interfaces: Reactions and Electrochemistry - Experiment II
O 34.3: Talk
Tuesday, March 21, 2017, 11:15–11:30, HSZ 101
Atomic-level electrochemical surface science of TiO2 rutile (110) — •Matthias Müllner, Jan Balajka, Michael Schmid, Ulrike Diebold, and Stijn Mertens — TU Wien, Institut für Angewandte Physik, Wiedner Hauptstrasse 8-10/134, 1040 Vienna
The rational design of catalysts and other functional materials requires an atomic-level understanding of their structure and of the interface to supporting surfaces.
Here, we present an in situ electrochemical STM study of TiO2 rutile (110) with atomic resolution. This is achieved using a new wet-chemical cleaning procedure for the substrate and with Pt-Ir tips. If tungsten tips are used, WO3 is spontaneously formed at the tungsten liquid interface and strongly adsorbs on oxide surfaces below their point of zero charge through an electrostatic mechanism. The tungsten oxide forms 1D oligomers up to a coverage of one monolayer, and can be manipulated and nanopatterned in situ with the scanning probe tip. Under clean conditions, the TiO2 rutile (110) surface shows a bulk-like, unreconstructed structure, which resembles its appearance in vacuum, even though the surface is probably fully hydroxylated.