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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Water on Surfaces

O 6.1: Vortrag

Montag, 1. April 2019, 10:30–10:45, H16

Identification of OH groups from water dissociation on In2O3(111) with nc-AFM — •Margareta Wagner1, Martin Setvín1, Lynn A. Boatner2, Michael Schmid1, Bernd Meyer3, and Ulrike Diebold11Institut für Angewandte Physik, TU Wien, Österreich — 2Materials Science and Technology Division, ORNL, Tennessee, USA — 3Computer Chemistry Center, FAU Erlangen-Nürnberg, Deutschland

In2O3 is a complex oxide material with a large unit cell where the (111) surface features a total of 12 surface oxygen atoms in four inequivalent sites. Dissociated water molecules result in two hydroxyl groups adsorbed on the surface, but only one type of surface oxygen atoms is involved in the adsorption [1]. With non-contact atomic-force microscopy (nc-AFM) we are able to identify not only the 12 individual topmost oxygen atoms of the In2O3(111) surface but also the individual OH groups formed upon water dissociation. Moreover, the hydrogen atom of the surface OH can be manipulated with the STM tip. This can lead to the formation of a new OH group by re-adsorption of the hydrogen atom on one of the inequivalently sited surface oxygen atoms nearby. In this work the individual OH groups are characterized and identified by their force-distance curves.

[1] M. Wagner et al., ACS Nano 11 (2017) 11531-11541.

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