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• W2950404544 abstract "Abstract In-situ X-ray absorption spectra of an electrochemically deposited monolayer and bilayer of copper on a gold (100) surface immersed in an electrolytic solution and under potential control were obtained by using fluorescence detection under grazing incidence, the X-rays being polarized parallel to the plane of the gold surface. This study revealed that two distinct structural configurations are obtained for copper on gold (100) depending on the film thickness. For a full-coverage monolayer of copper, the X-ray absorption near edge structure (XANES) revealed clearly that a charge-transfer process occurred from the copper atoms to the gold substrate where the oxidation state of copper was close to Cu+. The Fourier transforms of the Cu K edge extended X-ray absorption spectroscopy (EXAFS) oscillations exhibited (i) an unresolved split peak in the range 0.1–0.25 nm and (ii) a second well-defined peak at around 0.35 nm. The nearest neighbours were determined to be oxygen at 0.197 ± 0.003 nm and copper at 0.266 ± 0.003 nm. The copper-copper distance lies in between the gold-gold lattice spacing (0.288 nm) and the copper-copper one (0.254 nm), which seems to indicate that structural rearrangement of the first gold atom layer occurs. The observation of copper backscattering suggests only that the copper atoms sit in an “ atop ” site. This geometry associated with the charge-transfer process is stabilized by oxygen atoms coming from the water molecules or from the sulphate ions. The second peak in the Fourier transform is connected mainly with the second copper neighbours located at 0.372 ± 0.003 nm, in good agreement with the “ atop ” geometry. When two copper layers were deposited electrochemically on gold (100), strong structural modifications were observed. The Fourier transform exhibited only one split peak in the range 0.15–0.35 nm. Under these conditions, no oxygen is detected and the near neighbours correspond to copper at 0.259 ± 0.003 nm and copper at 0.290 ± 0.003 nm. The second copper-copper distance is very close to the usual gold-gold lattice spacing, suggesting that the first copper layer forms a commensurate phase on the gold (100) surface. The first distance due to the second copper layer is close to the copper-copper lattice spacing but a small discrepancy is still observed. These results reveal that a reconstruction process occurs when one copper layer is added onto the first one where the copper atoms evolve from an “ atop ” site stabilized by oxygen to a 4-fold hollow site." @default.
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• W2950404544 date "1990-12-11" @default.
• W2950404544 modified "2023-09-24" @default.
• W2950404544 title "ChemInform Abstract: In-Plane Structural and Electronic Characteristics of Underpotentially Deposited Copper on Gold(100) Probed by in-situ X-Ray Absorption Spectroscopy." @default.
• W2950404544 cites W2038880633 @default.
• W2950404544 doi "https://doi.org/10.1002/chin.199050014" @default.
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