Abstract
The potentialities of electrochemical method of removal of adsorbed octanethiol layer from gold electrode surface are considered. The dependence of a degree of gold macro- and microelectrode cleaning on the electrolyte composition, potential cycling range, and the number of cycles is studied. It is shown that the commonly used method of cleaning by multiple potential cycling in the perchloric acid solution in the potential range from 0 to 1400 mV (SCE) is not sufficiently efficient. Cycling in the water-ethanol solution of perchloric acid promotes the octanethiol desorption and leads to the complete regeneration of surface even after 6–8 cycles. This is evidenced by comparing with the voltammograms, which were obtained on pure Au surface in 4 mM potassium ferri-ferrocyanide and 0.1 M HClO4 solutions. A range of ethanol concentrations, which provides the highest degree of gold surface cleaning, is determined. The electrochemical method of cleaning by using water-ethanol solution of perchloric acid enables one to perform multiple electrode regeneration without destruction of thin gold layer (for example, in the quartz microbalance), which takes place in the case of chemical regeneration in the “piranha” solution based on sulfuric acid and hydrogen peroxide.
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Original Russian Text © S.N. Ovchinnikova, A.Zh. Medvedev, 2015, published in Elektrokhimiya, 2015, Vol. 51, No. 4, pp. 339–346.
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Ovchinnikova, S.N., Medvedev, A.Z. Desorption of octanethiol from gold electrode surface during its electrochemical cleaning. Russ J Electrochem 51, 287–293 (2015). https://doi.org/10.1134/S1023193515040084
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DOI: https://doi.org/10.1134/S1023193515040084