Conditions Extrêmes et Matériaux : Haute Température et Irradiation
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2022

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Salima Mabrouk, Hervé Rinnert, Lavinia Balan, Jordane Jasniewski, Ghouti Medjahdi, Rafik Ben Chaabane, Raphaël Schneider, 'Aqueous synthesis of core/shell/shell ZnSeS/Cu:ZnS/ZnS quantum dots and their use as a probe for the selective photoluminescent detection of Pb2+ in water', J. Photochem. Photobiol. A 431 114050 (2022) doi:10.1016/j.jphotochem.2022.114050

Water-dispersible core/shell/shell ZnSeS/Cu:ZnS/ZnS quantum dots (QDs) capped with 3-mercaptopropionic acid (3-MPA) were successfully prepared via a one-pot method. The dots are photostable, exhibit a Cu-related photoluminescence (PL) emission located at 500 nm and a PL quantum yield of 21%. The PL of ZnSeS/Cu:ZnS/ZnS QDs was demonstrated to be selectively quenched by Pb2+ ions and a method for the rapid and sensitive detection of Pb2+ in real water samples was developed. Under the optimized conditions, the PL intensity of ZnSeS/Cu:ZnS/ZnS QDs is almost linearly dependent on the Pb2+ concentration in the range of 0.04 to 6 µM and the detection limit is 21 nM in water. Based on PL lifetime and UV–visible absorption measurements, a dynamic quenching mechanism was demonstrated. ZnSeS/Cu:ZnS/ZnS QDs were also demonstrated to be efficient probes for the detection of Pb2+ in real water samples. The developed method is rapid, simple and sensitive and demonstrates that ZnSeS/Cu:ZnS/ZnS QDs can be used as non-toxic probes to sense Pb2+ ions in aqueous solution.