Abstract
The simple preparation of a nanohybrid of terbium-doped carbon dots/glutathione-capped copper nanoclusters (Tb@CDs/GSH-CuNCs) was for the first time developed for ratiometric detection of phosphate anion (Pi). Blue-emission of Tb@CDs can trigger non-luminescence of GSH-CuNCs for aggregation-induced emission (AIE) performance due to the strong reserved coordination capacity of Tb3+. Thus, Tb@CDs/GSH-CuNCs rapidly generated dual-emission signals at 630 nm and 545 nm by directly mixing the two individual materials via the AIE effect, alongside fluorescence resonance energy transfer (FRET) process. However, by the introduction of Pi, both AIE and FRET processes were blocked because of the stronger binding affinity of Tb3+ and Pi than that of Tb3+ and –COOH on Tb@CDs, thus realizing successful ratiometric detection of Pi. The linear concentration range was 0–16 μM, with the limit of detection (LOD) of 0.32 μM. The proposed method provided new ideas for designing nanohybrid of CDs and nanoclusters (MNCs) as ratiometric fluorescent probes for analytical applications.
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All authors contributed to the study conception and design. Material preparation and data collection and analysis were performed by Jingxiang Shen; the first draft of the manuscript was written by Jingxiang Shen; review, supervision, and editing were performed by Zhefeng Fan. All authors read and approved the final manuscript.
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Shen, J., Fan, Z. Construction of nanohybrid Tb@CDs/GSH-CuNCs as a ratiometric probe to detect phosphate anion based on aggregation-induced emission and FRET mechanism. Microchim Acta 190, 427 (2023). https://doi.org/10.1007/s00604-023-06005-5
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DOI: https://doi.org/10.1007/s00604-023-06005-5