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 journalArticleResearchpeer-review

84 Citations (Scopus)


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
Issue number18
Publication statusPublished - 10 Jun 2005


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


Dive into the research topics of 'Direct voltammetric determination of gold nanoparticles using graphite-epoxy composite electrode'. Together they form a unique fingerprint.

Cite this