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

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

Research output: Contribution to journalArticle

81 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.

Original languageEnglish
Pages (from-to)3702-3707
Number of pages6
JournalElectrochimica Acta
Volume50
Issue number18
DOIs
Publication statusPublished - 2005 Jun 10

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Graphite epoxy composites
Gold
Nanoparticles
Electrodes
Voltammetry
Gold Colloid
Electrochemical oxidation
Ions
Adsorption
Composite materials

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Pumera, Martin ; Aldavert, Marta ; Mills, Chris ; Merkoçi, Arben ; Alegret, Salvador. / Direct voltammetric determination of gold nanoparticles using graphite-epoxy composite electrode. In: Electrochimica Acta. 2005 ; Vol. 50, No. 18. pp. 3702-3707.
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Direct voltammetric determination of gold nanoparticles using graphite-epoxy composite electrode. / Pumera, Martin; Aldavert, Marta; Mills, Chris; Merkoçi, Arben; Alegret, Salvador.

In: Electrochimica Acta, Vol. 50, No. 18, 10.06.2005, p. 3702-3707.

Research output: Contribution to journalArticle

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AU - Pumera, Martin

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AU - Mills, Chris

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