Direct voltammetric determination of gold nanoparticles using graphite-epoxy composite electrode

Martin Pumera, Marta Aldavert, Chris Mills, Arben Merkoçi, Salvador Alegret

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82 Citations (Scopus)

Abstract

A new voltammetric method for a direct determination of gold nanoparticles, based on adsorption and electrochemical detection of colloidal gold, is described. In this protocol, the absorption of gold nanoparticles onto the rough surface of graphite-epoxy composite electrode is followed by their electrochemical oxidation in 0.1 M HCl medium at a potential of +1.25 V. The resulting tetrachloroaurate ions generated near the electrode surface are detected by differential pulse voltammetry (DPV). The DPV response is linear in the range from 4.7 × 108 to 4.7 × 1011 nanoparticles cm-3 with a limit of detection of 1.8 × 10 8 gold nanoparticles cm-3. The surface characteristics of the composite electrode are investigated and the parameters that affect the complete analytical detection process of gold nanoparticles are optimized. © 2005 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)3702-3707
JournalElectrochimica Acta
Volume50
Issue number18
DOIs
Publication statusPublished - 10 Jun 2005

Keywords

  • Differential pulse voltammetry
  • Gold nanoparticles
  • Graphite-epoxy composite
  • Stripping voltammetry

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