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

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

doi:10.1016/j.electacta.2005.01.035

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

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

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	3702-3707
Number of pages	6
Journal	Electrochimica Acta
Volume	50
Issue number	18
DOIs	https://doi.org/10.1016/j.electacta.2005.01.035
Publication status	Published - 2005 Jun 10

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All Science Journal Classification (ASJC) codes

Chemical Engineering(all)
Electrochemistry

Cite this

Pumera, M., Aldavert, M., Mills, C., Merkoçi, A., & Alegret, S. (2005). Direct voltammetric determination of gold nanoparticles using graphite-epoxy composite electrode. Electrochimica Acta, 50(18), 3702-3707. https://doi.org/10.1016/j.electacta.2005.01.035

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AB - 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.

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10.1016/j.electacta.2005.01.035