AI Article Synopsis
- A new electrochemical sensor has been developed for detecting copper ions using Au@Ag nanoparticles, which are affected by the presence of copper ions.
- The etching of the silver layer around these nanoparticles is catalyzed by copper ions when thiosulfate is present, leading to decreased voltammetry signals that allow for concentration measurement.
- The sensor shows high sensitivity (detection limit of 0.3 nM) and selectivity for Cu(2+) across a range of 1 nM to 100 μM, and it has been successfully applied to test copper levels in river water.
Article Abstract
A new sensitive electrochemical sensor for the detection of copper ions based on the copper ion assisted etching of Au@Ag nanoparticles was developed in this work. Since copper ions could greatly catalyze the etching process of the silver shell of Au@Ag nanoparticles in the presence of thiosulfate solutions, leading to an obvious decrease of the linear sweep voltammetry (LSV) signals of silver, the concentration of the copper ions, therefore, can be measured. Under the optimized conditions, the electrochemical sensor exhibited excellent sensitivity and selectivity for Cu(2+), with wide linear ranges of 1 nM to 100 μM, and the detection limit of 0.3 nM. In addition, this method was successfully applied for the analysis of Cu(2+) in river water and exhibited good analytical performance.
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| http://dx.doi.org/10.1039/c5an01888a | DOI Listing |
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