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A MXene of type Ti3C2Tx functionalized with copper nanoclusters for the fluorometric determination of glutathione

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Abstract

Luminescent copper nanoclusters (Cu NCs) are chosen to functionalize Ti3C2Tx MXene flakes to form a new kind of nanohybrid. It was applied to the determination of glutathione (GSH) via photoluminescence (PL). The Cu NCs and MXene flakes are in close contact, and the blue PL of the Cu NCs (with excitation/emission peaks at 380/425 nm) is quenched. The addition of GSH triggers the separation of the nanohybrid. This results in the recovery of PL. GSH also promotes the PL of Cu NCs via host-guest interactions. Thus, target recognition, corresponding signal output and further magnification are accomplished in a single step. Under optimum conditions, the nanohybrid can detect GSH in the 5.0 to 100 μM concentration range and with a 3.0 μM detection limit. The assay is very specific and shows high selectivity towards metal ions, small biomolecules, amino acids, and thiol containing molecules.

Luminescent copper nanoclusters are used to functionalize Ti3C2Tx MXene flakes, forming a nanohybrid, which is applied to detect glutathione. Target recognition, signal output and magnification are accomplished in a single step, resulting in high selectivity.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (21804030), Natural Science Foundation of Guangdong Province (Grant No. 2018A030310420), Natural Science Foundation of Shenzhen University (Grant No. 2017004), Shenzhen Science and Technology Research Grant (Grant No. JCYJ20170818142354137).

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Correspondence to Zhenguang Wang or Yang Huang.

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Shi, Ye., Han, F., **e, L. et al. A MXene of type Ti3C2Tx functionalized with copper nanoclusters for the fluorometric determination of glutathione. Microchim Acta 187, 38 (2020). https://doi.org/10.1007/s00604-019-4000-x

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