Gold-gold junction electrodes:the disconnection method
Gold-gold junction electrodes:the disconnection method
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 (Erev?=?0.04 V vs. SCE) and sub-micromolar concentration of dopamine in 0.1?M phosphate buffer pH 7 (Erev?=?0.14 V vs. SCE). The potential future uses in analysis and limitations of gold-gold junction electrodes are discussed. DOI 10.1002/tcr.201100008
electroanalysis
gold electrodes
sensors
voltammetry
junction sensor
143-148
Dale, Sara E. C.
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Vuorema, Anne
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Ashmore, Ellen M. Y.
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Kasprzyk-Horden, Barbara
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Sillanpää, Mika
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Denuault, Guy
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Marken, Frank
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February 2012
Dale, Sara E. C.
e4af8df1-4555-4add-adbc-747fd37a2564
Vuorema, Anne
5afd68d5-9c32-4fed-96b9-8e2540c9cd41
Ashmore, Ellen M. Y.
b802743a-7501-4982-bdc5-4c08b65034aa
Kasprzyk-Horden, Barbara
521655c5-cc5b-4b7f-adfc-2d4f67cbca37
Sillanpää, Mika
463cf55c-defd-4e1b-aae1-73434c5c0795
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Marken, Frank
327ba500-d1f7-41f1-a22f-ca3308d14d96
Dale, Sara E. C., Vuorema, Anne, Ashmore, Ellen M. Y., Kasprzyk-Horden, Barbara, Sillanpää, Mika, Denuault, Guy and Marken, Frank
(2012)
Gold-gold junction electrodes:the disconnection method.
The Chemical Record, 12 (1), .
(doi: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 (Erev?=?0.04 V vs. SCE) and sub-micromolar concentration of dopamine in 0.1?M phosphate buffer pH 7 (Erev?=?0.14 V vs. SCE). The potential future uses in analysis and limitations of gold-gold junction electrodes are discussed. DOI 10.1002/tcr.201100008
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More information
e-pub ahead of print date: 7 September 2011
Published date: February 2012
Keywords:
electroanalysis
gold electrodes
sensors
voltammetry
junction sensor
Organisations:
Electrochemistry
Identifiers
Local EPrints ID: 336949
URI: http://eprints.soton.ac.uk/id/eprint/336949
ISSN: 1527-8999
PURE UUID: 877c5a0b-a606-4b3c-be65-b6c8b16e8bfb
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Date deposited: 11 Apr 2012 14:39
Last modified: 15 Mar 2024 02:44
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Contributors
Author:
Sara E. C. Dale
Author:
Anne Vuorema
Author:
Ellen M. Y. Ashmore
Author:
Barbara Kasprzyk-Horden
Author:
Mika Sillanpää
Author:
Frank Marken
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