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Effect of Water Vapor on Oxidation Processes of the Cu(111) Surface and Sublayer

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Title
Effect of Water Vapor on Oxidation Processes of the Cu(111) Surface and Sublayer
Author(s)
Young Jae Kim; Daeho Kim; Yongman Kim; Yongchan Jeong; Jeong, B.; Jeong Young Park
Publication Date
2023-01
Journal
International Journal of Molecular Sciences, v.24, no.1
Publisher
MDPI
Abstract
Copper-based catalysts have different catalytic properties depending on the oxidation states of Cu. We report operando observations of the Cu(111) oxidation processes using near-ambient pressure scanning tunneling microscopy (NAP-STM) and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS). The Cu(111) surface was chemically inactive to water vapor, but only physisorption of water molecules was observed by NAP-STM. Under O2 environments, dry oxidation started at the step edges and proceeded to the terraces as a Cu2O phase. Humid oxidation of the H2O/O2 gas mixture was also promoted at the step edges to the terraces. After the Cu2O covered the surface under humid conditions, hydroxides and adsorbed water layers formed. NAP-STM observations showed that Cu2O was generated at lower steps in dry oxidation with independent terrace oxidations, whereas Cu2O was generated at upper steps in humid oxidation. The difference in the oxidation mechanisms was caused by water molecules. When the surface was entirely oxidized, the diffusion of Cu and O atoms with a reconstruction of the Cu2O structures induced additional subsurface oxidation. NAP-XPS measurements showed that the Cu2O thickness in dry oxidation was greater than that in humid oxidation under all pressure conditions. © 2023 by the authors.
URI
https://pr.ibs.re.kr/handle/8788114/12443
DOI
10.3390/ijms24010810
ISSN
1661-6596
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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