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Gold-gold junction electrodes: The disconnection method


Reference:

Dale, S. E. C., Vuorema, A., Ashmore, E. M. Y., Kasprzyk-Hordern, B., Sillanpää, M., Denuault, G. and Marken, F., 2012. Gold-gold junction electrodes: The disconnection method. Chemical Record, 12 (1), pp. 143-148.

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Official URL:

http://dx.doi.org/10.1002/tcr.201100008

Abstract

The formation of gold-gold junction electrodes for application in electroanalysis is described here based on electro-deposition from a non-cyanide gold plating bath. Converging growth of two hemispherical gold deposits on two adjacent platinum microelectrodes (both 100 μm diameter in glass, ca. 45 μm gap) followed by careful etching in aqueous chloride solution was employed. During growth both gold hemispheres "connect" and during etching "disconnection" is evident in a drop in current. Gold-gold junctions with sub-micron gaps are formed and applied for the electroanalytical detection of sub-micromolar concentrations of hydroquinone in 0.1 M phosphate buffer pH 7 (E rev = 0.04 V vs. SCE) and sub-micromolar concentration of dopamine in 0.1 M phosphate buffer pH 7 (E rev = 0.14 V vs. SCE). The potential future uses in analysis and limitations of gold-gold junction electrodes are discussed. Copyright

Details

Item Type Articles
CreatorsDale, S. E. C., Vuorema, A., Ashmore, E. M. Y., Kasprzyk-Hordern, B., Sillanpää, M., Denuault, G. and Marken, F.
DOI10.1002/tcr.201100008
Uncontrolled Keywordssensors, voltammetry, gold electrodes, junction sensor, electroanalysis
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code29106

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