Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 20: Oxides II: Structures, Interactions and Reducibility
O 20.1: Talk
Monday, March 16, 2020, 15:30–15:45, WIL B321
From UHV to ambient conditions: Water on In2O3(111) — Hao Chen1,2, Matthias A. Blatnik1, Francesca Mirabella1, Giada Franceschi1, Michele Riva1, Michael Schmid1, Jan Čechal3, Bernd Meyer4, Ulrike Diebold1, and •Margareta Wagner1,3 — 1Inst. of Applied Physics, TU Wien, Wien, Austria — 2State Key Laboratory of Catalysis, CAS, iChEM, Dalian Inst. of Chem. Phys., Chin. Acad. of Science, Dalian, China — 3CEITEC, Brno University of Technology, Brno, Czech Republic — 4ICMM/CCC FAU Erlangen-Nürnberg, Erlangen, Germany
We study the interaction of water with the In2O3(111) surface, employing surface science techniques (TPD, XPS, non-contact AFM and STM as well as DFT calculations). The adsorption is investigated as a function of coverage, i.e., from single water molecules to multilayers, in UHV, at pressures present in the ambient and as a liquid. The saturation coverage at 300 K in UHV is three dissociated molecules per unit cell, visible as propeller-shaped bright protrusions in STM. Their internal structure is revealed by nc-AFM, showing in total six objects: 3 OH groups sharing a surface oxygen and 3 residual hydroxyl groups; TPD shows 3 desorption peaks above 300 K resulting from different desorption barriers for the recombining water molecules. After the interaction with liquid water also molecular water species are found on In2O3 (111).