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Issue 13, 2019
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An OFF–ON detection method for copper(ii) ions using a AgAu-NG nanocomposite modified electrode

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Abstract

An OFF–ON detection method for Cu2+ was developed at the AgAu bimetallic nanoparticle decorated nitrogen-doped graphene (AgAu-NG) nanocomposite modified electrode. The measurement was based on the copper-catalyzed oxidation of cysteamine (Cys) to regulate the oxidation peak current of Ag. In the absence of Cu2+, Cys can bind to the surface of AgAu-NG via the Ag–S or Au–S bond, thus leading to an obvious decrease of the oxidation peak current of Ag. However, in the presence of Cu2+, Cu2+ can greatly catalyze the oxidation of Cys by dissolved O2 to form cystamine, which would fall off the surface of AgAu-NG nanocomposites, leading to the partial recovery of the oxidation peak current of Ag. With the increase in the concentration of Cu2+, the oxidation peak current of Ag in the presence of Cys increases accordingly. So, the concentration of Cu2+ can be measured. By using the optimum conditions, this method can detect Cu2+ concentrations down to 0.3 nM (S/N = 3) with a linear response range of 1 nM–1 mM. Furthermore, this method was applied to determine Cu2+ concentrations in river water samples and showed excellent analytical performance.

Graphical abstract: An OFF–ON detection method for copper(ii) ions using a AgAu-NG nanocomposite modified electrode

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Supplementary files

Article information


Submitted
23 Mar 2019
Accepted
24 Apr 2019
First published
04 May 2019

Analyst, 2019,144, 3967-3971
Article type
Paper

An OFF–ON detection method for copper(II) ions using a AgAu-NG nanocomposite modified electrode

F. Kong, R. Li, L. Yao, H. Zou, H. Li, Z. Wang and W. Wang, Analyst, 2019, 144, 3967
DOI: 10.1039/C9AN00535H

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