Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 89: Oxide and Insulator Surfaces: Adsorption III
O 89.6: Vortrag
Donnerstag, 23. März 2017, 11:45–12:00, TRE Phy
Imaging and manipulation of dissociated water on In2O3(111) — •Margareta Wagner1, Martin Setvin1, Steffen Seiler2, Lynn A. Boatner3, Michael Schmid1, Bernd Meyer2, and Ulrike Diebold1 — 1Institut für Angewandte Physik, TU Wien, Österreich — 2Computer Chemistry Center, FAU Erlangen-Nürnberg, Deutschland — 3Materials Science and Technology Division, ORNL, Tennessee, USA
Indium oxide is one of the most important transparent conductive oxides (TCOs), and commonly used as a contact and sensor material.
Here, the adsorption of water is investigated with low temperature STM/AFM, XPS and DFT. Above 100 K dissociative adsorption of water on In2O3(111) single crystals is observed. At room temperature the surface is saturated with three dissociated water molecules per unit cell, symmetrically arranged around the six-fold coordinated In atoms. The fully hydroxylated surface shows a (1x1) structure with respect to the clean In2O3(111) surface. This leads to a well-ordered, hydroxylated surface where the three terminal OH groups plus the three protons (forming surface OH groups) are imaged together as one bright triangle in STM. The internal structure is revealed by AFM measurements, and manipulations with the STM tip, where surface OH grouse can be individually removed.