ScholarWorks@중앙대학교

초록

The poor water stability of metal halide perovskites poses a significant challenge to use them as a fluorescent probes in aqueous medium. To adress this problem α-cyclodextrin (α-CD) was employed as an encapsulating agent for the preparation of cesium lead bromide perovskite quantum dots (CsPbBr3@α-CD PQDs). To the best of our knowledge, this is the first report to demonstrate α-CD as a ligand to impart water stability of CsPbBr3 PQDs while preserving their fluorescence properties. The as-prepared water-stable green fluorescent CsPbBr3@α-CD PQDs acted as a fluorescent probe for the detection of propiconazole (PCZ) fungicide via a fluorescence “turn-off” mechanism. The present study illustrates the strong affinity of CsPbBr3@α-CD PQDs toward PCZ, favoring to achieve a good linear range of 0.05–50 μM with a limit of detection of 17.11 nM. The proposed method demonstrated excellent accuracy, achieving recoveries of 99.40 − 99.76% with relative standard deviations (RSD) of 0.22 − 0.28% and of 99.05 − 99.64% with RSD of 0.16 − 0.34% for PCZ assay in spiked soil and cabbage samples, respectively.

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