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Highly selective detection of nitroaromatic explosive 2,4,6-trinitrophenol (TNP) using N-doped carbon dots

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Abstract

Water-soluble fluorescent carbon dots (C-dots) were prepared by a hydrothermal process using guanine as the sole carbon and nitrogen source. The as-prepared C-dots were detailly characterized and discussed. Results demonstrated that C-dots were nearly spherical with an amorphous structure and an average diameter of 2.8 nm. C-dots exhibited a strong blue photoluminescence (26.8% quantum yield) with excitation-dependent properties and good stabilities against pH (6–12), salts and metal ions. Furthermore, C-dots were successfully developed for TNP sensing based on fluorescence quenching in water solution with high selectivity and sensitivity, and the detection limit was as low as 58.5 nM. The unchanged fluorescence lifetimes of C-dots suggested that luminescent quenching effect was predominantly caused by inner-filter effect (IFE). In addition, real sample analysis showed that the as-prepared C-dots had potential applications for the detection of TNP in environment.

Graphic abstract

N-doped carbon dots (C-dots) prepared by a hydrothermal approach were successfully developed for sensing of 2,4,6-trinitrophenol (TNP) based on fluorescence quenching in water solution with high selectivity and sensitivity.

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Acknowledgements

This work was supported by the backbone of excellent young talents at home and abroad visit the school training project of Anhui provincial high school (gxgwfx2018075, gxyqZD2017079), the National Science Foundation of China (21401065), the Key Project of the Natural Science Foundation of the Anhui Higher Education Institutions (KJ2018A0405, KJ2019A0613), Anhui Key Research and Development Projects (1804a09020072) and Research Results of University-level Projects of Huangshan University No.: 2019xkjq013.

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Authors and Affiliations

  1. Key Laboratory of Inorganic Functional Materials, Department of Chemistry, Huangshan University, Huangshan, 245041, Anhui, China

    Yuchuan Zheng, ·Shu Wang, Ruifeng Li, Le Pan, Liangqing Li, Zhaopeng Qi & Changjiang Li

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  1. Yuchuan Zheng
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  2. ·Shu Wang
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  3. Ruifeng Li
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  7. Changjiang Li
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Correspondence to Changjiang Li.

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Zheng, Y., Wang, ·., Li, R. et al. Highly selective detection of nitroaromatic explosive 2,4,6-trinitrophenol (TNP) using N-doped carbon dots. Res Chem Intermed 47, 2421–2431 (2021). https://doi.org/10.1007/s11164-021-04410-0

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