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Water adsorption on...
Water adsorption on vanadium oxide thin films in ambient relative humidity
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- Goodacre, Dana (author)
- University of Auckland,Lawrence Berkeley National Laboratory
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- Blum, Monika (author)
- Lawrence Berkeley National Laboratory
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- Buechner, Christin (author)
- Lawrence Berkeley National Laboratory
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- Hoek, Harmen (author)
- Lawrence Berkeley National Laboratory,University of Twente
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- Gericke, Sabrina M. (author)
- Lund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Lawrence Berkeley National Laboratory
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- Jovic, Vedran (author)
- GNS Science
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- Franklin, Joseph B. (author)
- Lawrence Berkeley National Laboratory,University College London
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- Kittiwatanakul, Salinporn (author)
- Chulalongkorn University,University of Virginia
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- Söhnel, Tilo (author)
- University of Auckland
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- Bluhm, Hendrik (author)
- Fritz Haber Institute of the Max Planck Society
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- Smith, Kevin E. (author)
- Boston University
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(creator_code:org_t)
- AIP Publishing, 2020
- 2020
- English.
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In: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 152:4
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Abstract
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- In this work, ambient pressure X-ray photoelectron spectroscopy (APXPS) is used to study the initial stages of water adsorption on vanadium oxide surfaces. V 2p, O 1s, C 1s, and valence band XPS spectra were collected as a function of relative humidity in a series of isotherm and isobar experiments. Experiments were carried out on two VO2 thin films on TiO2 (100) substrates, prepared with different surface cleaning procedures. Hydroxyl and molecular water surface species were identified, with up to 0.5 ML hydroxide present at the minimum relative humidity, and a consistent molecular water adsorption onset occurring around 0.01% relative humidity. The work function was found to increase with increasing relative humidity, suggesting that surface water and hydroxyl species are oriented with the hydrogen atoms directed away from the surface. Changes in the valence band were also observed as a function of relative humidity. The results were similar to those observed in APXPS experiments on other transition metal oxide surfaces, suggesting that H2O-OH and H2O-H2O surface complex formation plays an important role in the oxide wetting process and water dissociation. Compared to polycrystalline vanadium metal, these vanadium oxide films generate less hydroxide and appear to be more favorable for molecular water adsorption.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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Goodacre, Dana
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Blum, Monika
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Buechner, Christ ...
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Hoek, Harmen
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Gericke, Sabrina ...
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Jovic, Vedran
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show more...
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Franklin, Joseph ...
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Kittiwatanakul, ...
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Söhnel, Tilo
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Bluhm, Hendrik
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Smith, Kevin E.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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Journal of Chemi ...
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Lund University