Mechanism of copper passivation in aqueous sodium carbonate-bicarbonate solution derived from combined X-ray photoelectron spectroscopic and electrochemical data

Article Abstract:

The composition and chemical state of the passive layers formed on copper specimens after electrochemical oxidation and reduction cycles in carbonate-containing aqueous solutions in the 9-11 pH range are analyzed by employing X-ray photoelectron spectroscopy (XPS). XPS examination of copper after electrochemical polarization in these solutions revealed that an oxide film had formed on the surface. Further, the addition of carbonate species to the surface layers could also be observed. A comparison between these results and previous findings is discussed.

Usage, X-ray spectroscopy

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Nucleation of trace copper on the H-Si(111) surface in aqueous fluoride solutions

Article Abstract:

Scanning tunneling microscopy was used in studying the nucleation of trace amounts of copper on the H-Si(111)(1x1) surface in aqueous fluoride solution. Metal deposition on the step-flow etching and O2-initiated pitting of H-Si(111) has also been examined. It has been observed that copper nucleates preferentially along step edges and inhibits the step-flow etching of silicon. Copper also appears to prevent the formation of terrace etch pits which is supposed to be catalyzed by dissolved oxygen.

Fluorides, Nucleation, Nucleation (Chemistry)

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Underpotential deposition of copper on iodine-modified Pt(111): in situ STM and ex situ LEED studies

Article Abstract:

The dynamic mechanism of underpotential deposition (UPD) of copper on iodine-modified Pt(111) electrode in sulfuric acid solution was studied by in situ scanning tunneling microscopy and ex situ low-energy electron diffraction. Results showed that well-arranged iodine adlayers with the structures of (3 X 3) and (sq root of 7 X sq root of 7)R19.1 degrees can be prepared by immersion of the electrode in a solution containing iodide ions under potential control.

Platinum, Iodine, Iodine (Chemical element)

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