Ligand-free solvent evaporation approach for synthesis of water stable CsPbBr3@Pb(OH)Br PQDs for detection of hypochlorite in water samples

초록

Although lead halide perovskite quantum dots (PQDs) have proven to be potential materials for various applications, the fabrication of water dispersible/stable PQDs are very challenging due to their susceptibility to water degradation and ionic structure. To improve the stability of PQDs in water, their encapsulation with organic or inorganic matrices has received great attention. In this work, a ligand-free solvent evaporation approach was introduced for the synthesis of water stable CsPbBr3@Pb(OH)Br PQDs with enhanced fluorescence properties. The as-synthesized CsPbBr3@Pb(OH)Br PQDs displayed a mean size of 15.17 ± 5.06 nm, exhibiting an emission peak at 516 nm. These CsPbBr3@Pb(OH)Br PQDs acted as a selective and effective probe for detecting hypochlorite (ClO-) ions. A visible color change was observed upon exposure to ClO- under UV lamp. The as-prepared CsPbBr3@Pb(OH)Br were successfully used as a fluorescent nanoprobe to detect ClO- by fluorescence spectroscopy, favoring to achieve a detection limit of 21.65 nM. Additionally, the CsPbBr3@Pb(OH)Br PQDs were successfully loaded onto paper strips for on-site detection of ClO- in tap water samples. This research introduces an innovative approach to fabricate aqueous-stable perovskite sensor for ClO- assay in real samples. © 2025 Elsevier Ltd

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