Abstract
Nitrogen-doped carbon dots (NCDs) were synthesized via hydrothermal treatment of vitamin B1 and triethylamine. The NCDs exhibit strong blue fluorescence (with a peak at 437 nm at an excitation wavelength of 370 nm), good water solubility and excellent fluorescence stability in the pH 3~12 range, at ionic strengths between 0.01 and 1 M, and under UV illumination for 6 h, as well as incubation temperature of 15~60 °C. The nanoparticles respond selectively and sensitively to trace concentrations of perfluorooctane sulfonate (PFOS) through electrostatic interactions between PFOS and NCDs. This is accompanied by the aggregation of NCDs to yield enhanced fluorescence. The nanoprobe has high selectivity for PFOS even in presence of other common ions such as metal ions, anions, and structural analogues such as surfactants. Under the optimal conditions, the response is linear in the 0.3 to 160 nM PFOS concentration range with a detection limit of 0.3 nM. Satisfactory results were achieved for determination of PFOS in spiked real water samples.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 21665018 and 21366024), Natural Science Foundation of Jiangxi Province (No. 20181BAB203014) and Foundation of Jiangxi Educational Committee (No. GJJ160724). This work was also supported by the “Graduate Student Innovation Funds for the Nanchang Hangkong University (No.YC2018-S361)”.
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Highlights
1) Nitrogen-doped carbon dots are a viable nanoprobe for PFOS detection
2) The detection strategy is based on fluorescence enhancement with LOD of 0.3 nM
3) The nanoprobe is sensitive and selectivity for PFOS detection in water samples
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Lin, L., Zhou, S., Guo, H. et al. Nitrogen-doped carbon dots as an effective fluorescence enhancing system for the determination of perfluorooctyl sulfonate. Microchim Acta 186, 380 (2019). https://doi.org/10.1007/s00604-019-3501-y
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DOI: https://doi.org/10.1007/s00604-019-3501-y