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

被引：79

作者：

Pumera, M

Aldavert, M

Mills, C

Merkoçi, A

Alegret, S

机构：

[1] Univ Autonoma Barcelona, Dept Quim, Grp Sensors & Biosensors, E-08193 Barcelona, Catalonia, Spain

[2] Lab Recerca & Nanobioengn, Barcelona 08028, Spain

来源：

ELECTROCHIMICA ACTA | 2005年 / 50卷 / 18期

关键词：

gold nanoparticles; graphite-epoxy composite; stripping voltammetry; differential pulse voltammetry;

D O I：

10.1016/j.electacta.2005.01.035

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

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 x 10(8) to 4.7 x 10(11) nanoparticles cm(-3) with a limit of detection of 1.8 x 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. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：3702 / 3707

页数：6

共 28 条

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