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초록

Herein, a facile synthetic approach for β-cyclodextrin (β-CD) stabilized fluorescent gold nanoclusters (AuNCs) has been introduced. The β-CD@AuNCs are uniformly monodispersed, possess an ultrasmall average size of 1.95 nm, and exhibit strong emission (450 nm, 12.09 ns lifetime). Intriguingly, ferric ions (Fe3+) effectively diminish the emission intensity of β-CD@AuNCs through an inner filter effect (IFE) process, owing to the notable overlap of the absorption spectrum of Fe3+ ions with the excitation spectrum of β-CD@AuNCs. This quenching enables the establishment of a signal-off platform for the sensitive and selective determination of Fe3+ ions. The developed platform exhibits a linear quenching response to Fe3+ concentrations from 0.20 to 400.0 µM (R2 = 0.995) with a low LOD (80.0 nM), surpassing the U.S. Environmental Protection Agency's limit for drinking water (≈ 5.5 µM). Furthermore, this probe demonstrates an excellent selectivity among several metal ions. Based on these promising features, this sensing platform is successfully applied for the assay of Fe3+ ions in diverse environmental water samples and medicinal iron supplement tablets. © 2025 Elsevier B.V.

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