Abstract
We demonstrate here the first use of water-soluble copper indium sulfide quantum dots (CuInS2 QDs) as the chemiluminescence (CL) reagent and its application to the highly sensitive detection of diniconazole. We utilized a hydrothermal method for synthesis of mercaptopropionic acid-capped CuInS2 QDs, which were characterized by TEM image, EDS, and XRD pattern. The performance of these QDs as the CL reagent was investigated by using several oxidizing agents and found that acidic potassium permanganate (KMnO4) gave the highest CL signal. CuInS2 QDs/KMnO4 as a novel CL probe was then used for assay of diniconazole based on its unique enhancing effect. In the optimum settings, a linear calibration plot was obtained for diniconazole in the concentration range of 4.0 × 10−9 mol L−1–1.5 × 10−6 mol L−1, with a limit of detection of 1.0 × 10−9 mol L−1. The study of interferences and recoveries confirmed the suitability of the method for assay of environmental water samples.
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