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Article Abstract
An OFF-ON detection method for Cu 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 Cu, 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 Cu, Cu can greatly catalyze the oxidation of Cys by dissolved O 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 Cu, the oxidation peak current of Ag in the presence of Cys increases accordingly. So, the concentration of Cu can be measured. By using the optimum conditions, this method can detect Cu 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 Cu concentrations in river water samples and showed excellent analytical performance.
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