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Characterisation of a thiosulphate-sulphite gold electrodeposition process
Authors:M J-Liew
Affiliation:School of Chemical Engineering and Advanced Materials, Institute of Nanoscale Science and Engineering, University of Newcastle, Merz Court, Newcastle upon Tyne NE1 7RU, UK
Abstract:Electrodeposition of soft gold is an important process in the fabrication of micro devices for electronics, optics etc. Traditional gold electroplating is based on a gold cyanide process which is not applicable for the stringent requirements in state of the art micro device manufacture. Newcastle University has been involved in the development of an industrial process based on a mixed ligand electrolyte—the gold thiosulphate-sulphite system. Here we present methods for the formulation of this electrolyte in the laboratory which ensure bath stability and process compatibility. In addition, we have carried out spectrophotometry to elucidate the possible reasons of its chemical stability. Standard rotating disk and cyclic voltammetry has been carried out to determine the electrochemical behaviour of the gold thiosulphate-sulphite system. The changes in electrochemical behaviour as the bath ages are also discussed.
Keywords:Gold electrodeposition  Thiosulphate-sulphite electrolyte  UV-vis spectroscopy  Cyclic voltammetry  Rotating disc electrode
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