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Dual-mode sensing strategy based on carbon dots for sensitive and selective detection of molybdate ions

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Abstract

Two kinds of carbon dots with the maximum fluorescence peak of 492 nm (named as G-CDs) and 607 nm (named as R-CDs) were synthesized. In the presence of MoO42− ions, the fluorescence of R-CDs at 607 nm can be quenched, which can probably be assigned to their aggregation caused by MoO42−, while that of G-CDs at 492 nm remained unchanged. For the first time, a ratiometric fluorescence probe was developed for MoO42− ions detection. In the range 0.25 ~ 100 μM, the fluorescence ratio (F492/F607) of the probe was linearly related to MoO42− concentration, and the detection limit was 61.5 nM, which fully meets the minimum detection requirements of MoO42− ions in drinking water. On the other hand, when MoO42− was introduced, a significant fading phenomenon of R-CDs can be observed with the naked eye; thereby, the colorimetric method can also be proposed. Based on above, the ratiometric fluorometric/colorimetric dual-mode sensing method was established for MoO42− anion quantification. Compared with the traditional analysis methods, the results obtained by multimodal sensing can be mutually verified, which effectively improves the accuracy and reliability. The dual-mode assay proposed in this work provides an alternative scheme to meet the need of sensing target compounds in complex matrices.

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Acknowledgements

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (21705083 and 22066019), Natural Science Foundation of Jiangxi Province (20202BABL203019).

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Authors and Affiliations

  1. Jiangxi Key Laboratory of Industrial Ceramics, College of Materials and Chemical Engineering, Pingxiang University, Pingxiang, 337055, China

    Hui-Hui Zeng, Ren-Xiu Huang, Ming-Qiang Jiang, Fang Liu, Wei-Guo Shi & Lin Chen

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Zeng, HH., Huang, RX., Jiang, MQ. et al. Dual-mode sensing strategy based on carbon dots for sensitive and selective detection of molybdate ions. Microchim Acta 191, 187 (2024). https://doi.org/10.1007/s00604-024-06275-7

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