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 › peer-review

89 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

Bibliographical note

Funding Information:
This work was financially supported by MEC (Madrid) (projects BIO2004-02776, MAT2004-05164), by the Spanish “Ramón Areces” foundation (project ‘Bionanosensores’) and the “Ramón y Cajal” program of the Ministry of Science and Technology (Madrid) that supports A. Merkoçi and C. Mills. M.P. acknowledges the support from the NATO NSF.

All Science Journal Classification (ASJC) codes

Chemical Engineering(all)
Electrochemistry

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10.1016/j.electacta.2005.01.035

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title = "Direct voltammetric determination of gold nanoparticles using graphite-epoxy composite electrode",

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.",

author = "Martin Pumera and Marta Aldavert and Chris Mills and Arben Merko{\c c}i and Salvador Alegret",

note = "Funding Information: This work was financially supported by MEC (Madrid) (projects BIO2004-02776, MAT2004-05164), by the Spanish “Ram{\'o}n Areces” foundation (project {\textquoteleft}Bionanosensores{\textquoteright}) and the “Ram{\'o}n y Cajal” program of the Ministry of Science and Technology (Madrid) that supports A. Merko{\c c}i and C. Mills. M.P. acknowledges the support from the NATO NSF.",

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doi = "10.1016/j.electacta.2005.01.035",

language = "English",

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AU - Pumera, Martin

AU - Aldavert, Marta

AU - Mills, Chris

AU - Merkoçi, Arben

AU - Alegret, Salvador

N1 - Funding Information: This work was financially supported by MEC (Madrid) (projects BIO2004-02776, MAT2004-05164), by the Spanish “Ramón Areces” foundation (project ‘Bionanosensores’) and the “Ramón y Cajal” program of the Ministry of Science and Technology (Madrid) that supports A. Merkoçi and C. Mills. M.P. acknowledges the support from the NATO NSF.

PY - 2005/6/10

Y1 - 2005/6/10

N2 - 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.

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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JO - Electrochimica Acta

JF - Electrochimica Acta

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IS - 18

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

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Bibliographical note

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