Ambient pressure X-ray photoelectron spectroscopy study of room-temperature 
oxygen adsorption on Cu(1 0 0) and Cu(1 1 1)

Liu, Bo-Hong; Huber, Maximilian; van Spronsen, Matthijs A.; Salmeron, Miquel; Bluhm, Hendrik

doi:10.1016/j.apsusc.2022.152438

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Ambient pressure X-ray photoelectron spectroscopy study of room-temperature oxygen adsorption on Cu(1 0 0) and Cu(1 1 1)

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Bluhm, Hendrik
Chemical Sciences Division, Lawrence Berkeley National Laboratory;
Advanced Light Source, Lawrence Berkeley National Laboratory;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Liu, B.-H., Huber, M., van Spronsen, M. A., Salmeron, M., & Bluhm, H. (2022). Ambient pressure X-ray photoelectron spectroscopy study of room-temperature oxygen adsorption on Cu(1 0 0) and Cu(1 1 1). Applied Surface Science, 583: 152438. doi:10.1016/j.apsusc.2022.152438.

Cite as: https://hdl.handle.net/21.11116/0000-000A-52DD-1

Abstract

We investigated the room-temperature chemisorption of oxygen on Cu(1 0 0) and Cu(1 1 1) using ambient-pressure X-ray photoelectron spectroscopy (APXPS). A shoulder-to-shoulder comparison between the oxygen-gas titration on the two surfaces reveals that Cu(1 0 0) is the more active for oxygen dissociative chemisorption when the surfaces are clean. The (2 √ 2 × √ 2 )R45^o missing-row reconstruction appears in Cu(1 0 0)’s LEED image after about 104 Langmuir of oxygen exposure, whereas on Cu(1 1 1), no long-range ordering was observed throughout the whole experiment. An oxide layer consisting of cuprous and cupric oxide shows up on Cu(1 1 1) at an oxygen exposure that is significantly lower than for Cu(1 0 0). This observation suggests that the presence of (2 √ 2 × √ 2 )R45^o missing-row reconstruction layer slows down Cu(1 0 0) oxidation. Literature has widely reported that surface morphology influences the copper oxidation process. This study provides an XPS demonstration that copper surface oxide formation in O₂ at room temperature depends on the surface crystallographic orientation.