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<p>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 Pb<sup>2+</sup> 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.</p>

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Synthesis of highly stable quantum dots -zirconium phosphate nanocomposite and their application in fluorescence sensing and biocompatibility

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Sundararajan Parani,
  • Sahul Hameed Syed Ali,
  • G. Ramanjaneya Reddy,
  • Jang-Kun Song

摘要

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.