Gold-gold junction electrodes: The disconnection method

Sara E.C. Dale; Anne Vuorema; Ellen M.Y. Ashmore; Barbara Kasprzyk-Horden; Mika Sillanpää; Guy Denuault; Frank Marken

doi:10.1002/tcr.201100008

Gold-gold junction electrodes: The disconnection method

Sara E.C. Dale, Anne Vuorema, Ellen M.Y. Ashmore, Barbara Kasprzyk-Horden, Mika Sillanpää, Guy Denuault, Frank Marken

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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.

Original language	English
Pages (from-to)	143-148
Number of pages	6
Journal	Chemical Record
Volume	12
Issue number	1
DOIs	https://doi.org/10.1002/tcr.201100008
Publication status	Published - Feb 2012
Externally published	Yes

Keywords

electroanalysis
gold electrodes
junction sensor
sensors
voltammetry

ASJC Scopus subject areas

General Chemistry
Biochemistry
General Chemical Engineering
Materials Chemistry

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10.1002/tcr.201100008

Cite this

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title = "Gold-gold junction electrodes: The disconnection method",

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.",

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T2 - The disconnection method

AU - Dale, Sara E.C.

AU - Vuorema, Anne

AU - Ashmore, Ellen M.Y.

AU - Kasprzyk-Horden, Barbara

AU - Sillanpää, Mika

AU - Denuault, Guy

AU - Marken, Frank

PY - 2012/2

Y1 - 2012/2

N2 - 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.

AB - 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.

KW - electroanalysis

KW - gold electrodes

KW - junction sensor

KW - sensors

KW - voltammetry

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JO - Chemical Record

JF - Chemical Record

IS - 1

ER -

Gold-gold junction electrodes: The disconnection method

Abstract

Keywords

ASJC Scopus subject areas

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