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- W2041621622 abstract "This paper reports ac impedance and cyclic voltammetry studies of underpotential deposition (UPD) of Cu on Au in an electrolyte composed of and . A theoretical kinetic model was developed which fits the experimental impedance spectra over frequencies ranging from 0.001 to 20,000 Hz. Spectra are characterized by a two‐time constant process; two capacitive loops were observed in the Nyquist diagrams corresponding to two distinctive peaks in the Bode phase plot. The high frequency time constant is associated with the double‐layer capacitance, while the low frequency process is due to relaxation phenomena associated with the charge transfer involved in Cu2+ electrosorption. Thiourea is one of the most important organic additives for commercial plating baths. Therefore, the coadsorption of thiourea and UPD Cu on Au was also studied by ac impedance. Adsorbed thiourea was found to have a dramatic effect on the high frequency peak in the Bode phase plot. Measurements such as these are proposed as a means of determining organic additive concentrations in Cu plating and electroforming baths." @default.
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- W2041621622 date "1985-11-01" @default.
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- W2041621622 title "Underpotential Deposition of Copper on Gold and the Effects of Thiourea Studied by AC Impedance" @default.
- W2041621622 doi "https://doi.org/10.1149/1.2113639" @default.
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