ScholarWorks@성균관대학교

초록

Quantum dots (QDs) are known for their exceptional optical and electronic properties; however, they often suffer from poor stability which limits their practical utility in aqueous environments. To overcome this limitation, we developed a nanocomposite system by embedding CuInS2-ZnS (CZIS) alloyed QDs within zirconium phosphate (ZrP) nanosheets, forming novel CZIS@ZrP nanocomposites. The composites were synthesized via an in-situ approach and the results revealed that the ZrP matrix and QDs interacted via metal-phosphate/carboxylate coordination, which significantly enhanced the stability of the QDs, retaining over 60% of their initial photoluminescence (PL) intensity even after 100 days, whereas neat QDs underwent aggregation and PL quenching. In fluorescence sensing assays, CZIS@ZrP nanocomposites exhibited high selectivity for Pb2+ ions, showing strong fluorescence quenching among 18 tested metal ions. Furthermore, the CZIS@ZrP nanocomposites demonstrated reduced cytotoxicity with MCF-7 cancer cells compared to neat CZIS QDs. This study underscores the potential of metal phosphate matrices for enhancing QD stability, highlighting their promise for analytical and biological applications.

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