Abstract
In this paper, carbon quantum dots (N-S-CDs) containing sulfur and nitrogen were synthesized using citric acid and thiourea. The average particle size of N-S-CDs is 8 nm. The N-S-CDs surface contains various of functional groups, which has good water solubility. The fluorescence quantum yield of N-S-CDs is as high as 36.8%. N-S-CDs emits strong blue fluorescence in aqueous solution and has good photostability in neutral and alkaline NaCl solution. N-S-CDs has unique selectivity and high sensitivity to Fe3+ and Hg2+ ions, and the lowest detection limits are 1.4 μM and 0.16 μM, respectively. Under the interference of other metal ions, Fe3+ and Hg2+ ions can still effectively and stably quench the fluorescence of N-S-CDs. In addition, in the detection of actual samples, N-S-CDs can effectively detect Fe3+ and Hg2+ ions in tap water and lake water.
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This work was financially supported by the Youth Foundation of He'nan Scientific Committee (202300410422) and Foundation of He'nan Educational Committee(21A470005).
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H L: Resource, Writing-review and Editing.H X: Methodology, Investigation, Writing. H L: Software, Data curation. All authors read and approved the final manuscript.
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Liu, H., Xu, H. & Li, H. Detection of Fe3+ and Hg2+ Ions by Using High Fluorescent Carbon Dots Doped With S And N as Fluorescence Probes. J Fluoresc 32, 1089–1098 (2022). https://doi.org/10.1007/s10895-022-02921-6
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DOI: https://doi.org/10.1007/s10895-022-02921-6