Gold-gold junction electrodes: The disconnection method

Sara E C Dale, A Vuorema, E M Y Ashmore, Barbara Kasprzyk-Hordern, M Sillanpää, G Denuault, Frank Marken

Research output: Contribution to journalArticle

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. Copyright
Original languageEnglish
Pages (from-to)143-148
Number of pages6
JournalChemical Record
Volume12
Issue number1
DOIs
Publication statusPublished - 2012

Keywords

  • sensors
  • voltammetry
  • gold electrodes
  • junction sensor
  • electroanalysis

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