ArticleJournal of the American Chemical Society2026
Character of Cu and O in partially oxidized "29" CuxO/Cu(111) from Auger Photoelectron Coincidence Spectroscopy.
Article in Journal of the American Chemical Society, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The controversial formal oxidation state of partially oxidized copper has been determined by the enhanced surface and chemical selectivity of Cu-L3VV, Cu-M3VV, and O-KVV Auger photoelectron coincidence spectroscopy (APECS) and first-principles calculations. We compare metallic Cu(111) of formal oxidation state (0), Cu2O cuprous Cu(I) oxide, and CuO cupric Cu(II) oxide to partially oxidized "29" CuxO/Cu(111). The oxidation state of Cu within the top three layers of "29" CuxO/Cu(111) is found as Cu(0.3) close to the formal Cu(0) oxidation state of metallic Cu(111). A distribution of oxygen chemical species is observed in agreement with the proposed three types of oxygen bonding. This clarifies essential steps for copper-based materials and chemistry by the enhanced selectivity of APECS made applicable to materials.
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