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Resolving the Struc...
Resolving the Structure of a Well-Ordered Hydroxyl Overlayer on In2O3(111) : Nanomanipulation and Theory
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- Wagner, Margareta (author)
- Technical University Vienna (TU Wien)
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- Lackner, Peter (author)
- Technical University Vienna (TU Wien)
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- Seiler, Steffen (author)
- Friedrich-Alexander University Erlangen-Nürnberg
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- Brunsch, Achim (author)
- Friedrich-Alexander University Erlangen-Nürnberg
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- Bliem, Roland (author)
- Technical University Vienna (TU Wien)
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- Gerhold, Stefan (author)
- Technical University Vienna (TU Wien)
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- Wang, Zhiming (author)
- Technical University Vienna (TU Wien)
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- Osiecki, Jacek (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Schulte, Karina (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Boatner, Lynn A. (author)
- Oak Ridge National Laboratory
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Schmid, Michael (author)
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- Meyer, Bernd (author)
- Friedrich-Alexander University Erlangen-Nürnberg
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- Diebold, Ulrike (author)
- Technical University Vienna (TU Wien)
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(creator_code:org_t)
- 2017-11-08
- 2017
- English 11 s.
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In: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 11:11, s. 11531-11541
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Abstract
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- Changes in chemical and physical properties resulting from water adsorption play an important role in the characterization and performance of device-relevant materials. Studies of model oxides with well-characterized surfaces can provide detailed information that is vital for a general understanding of water-oxide interactions. In this work, we study single crystals of indium oxide, the prototypical transparent contact material that is heavily used in a wide range of applications and most prominently in optoelectronic technologies. Water adsorbs dissociatively already at temperatures as low as 100 K, as confirmed by scanning tunneling microscopy (STM), photoelectron spectroscopy, and density functional theory. This dissociation takes place on lattice sites of the defect-free surface. While the In2O3(111)-(1 × 1) surface offers four types of surface oxygen atoms (12 atoms per unit cell in total), water dissociation happens exclusively at one of them together with a neighboring pair of 5-fold coordinated In atoms. These O-In groups are symmetrically arranged around the 6-fold coordinated In atoms at the surface. At room temperature, the In2O3(111) surface thus saturates at three dissociated water molecules per unit cell, leading to a well-ordered hydroxylated surface with (1 × 1) symmetry, where the three water OWH groups plus the surface OSH groups are imaged together as one bright triangle in STM. Manipulations with the STM tip by means of voltage pulses preferentially remove the H atom of one surface OSH group per triangle. The change in contrast due to strong local band bending provides insights into the internal structure of these bright triangles. The experimental results are further confirmed by quantitative simulations of the STM image corrugation.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology -- Nano-technology (hsv//eng)
Keyword
- density functional theory
- hydroxylation
- indium oxide
- scanning tunneling microscopy
- water dissociation
Publication and Content Type
- art (subject category)
- ref (subject category)
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ACS Nano
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- By the author/editor
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Wagner, Margaret ...
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Lackner, Peter
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Seiler, Steffen
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Brunsch, Achim
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Bliem, Roland
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Gerhold, Stefan
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show more...
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Wang, Zhiming
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Osiecki, Jacek
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Schulte, Karina
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Boatner, Lynn A.
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Schmid, Michael
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Meyer, Bernd
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Diebold, Ulrike
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Nano technology
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and Nano technology
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ACS Nano
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Lund University