Abstract
Herein, a rapid and straightforward electrochemical sensor was developed for the detection of Cu2O nanoparticles under neutral conditions via the use of a semipermeable Nafion membrane. This work successfully addresses the challenges associated with quantitative and onsite analysis of Cu2O nanoparticles at ultra-low concentrations. The electroreduction of Cu2O nanoparticles was significantly enhanced by improving the neutralization of the generated OH‒ ions through proton transfer facilitated by Nafion. The sensor exhibited linear detection ranges of 0.00–0.20 μg and 0.20–2.0 μg of Cu2O, with sensitivities of 107 ± 3 μA μg‒1 and 23 ± 3 μA μg‒1, respectively. The limit of detection (3SB/m) was determined to be 0.23 ng. The sensor demonstrated good reproducibility with a relative standard deviation below 5% and proved to be effective in detecting Cu2O nanoparticles in various water samples.
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