Journal
NEW JOURNAL OF CHEMISTRY
Volume 46, Issue 23, Pages 11296-11302Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nj00919f
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Funding
- National Natural Science Foundation of China (NSFC) [21804017]
- China Postdoctoral Science Foundation [2019M651242]
- Heilongjiang Postdoctoral Science Fund [LBH-Z18009]
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In this study, a new off-on fluorescence strategy for the determination of Ag+ and S2O32- was developed using nitrogen-doped carbon dots (N-CDs). The synthesized N-CDs exhibited bright blue fluorescence and could be selectively quenched by Ag+ ions. The quenching effect showed a linear relationship and had a low detection limit. Furthermore, the fluorescence of the N-CDs-Ag+ system could be restored by adding S2O32-, making it a promising method for the detection of S2O32- ions. The N-CDs were successfully applied to analyze Ag+ and S2O32- in real samples with satisfactory recoveries.
In this work, a new off-on fluorescence strategy for the determination of Ag+ and S2O32- is presented. Nitrogen-doped carbon dots (N-CDs) were synthesized using oxalic acid dihydrate and anhydrous ethylenediamine via a one-pot hydrothermal treatment without further chemical modification. The surface structure and optical properties of the synthesized N-CDs were characterized. The N-CDs emitted bright blue fluorescence with a high quantum yield of 26.01%. Ag+ could selectively quench the fluorescence of N-CDs due to the formation of a N-CDs-Ag+ complex on the surface. The quenching effect demonstrated a linear relationship in the range of 0-14 and 14-80 mu M with a low detection limit (LOD) of 150 nM. Furthermore, S2O32- could combine with Ag+ to generate a more stable Ag+-S2O32- complex, and thus the fluorescence of the N-CDs-Ag+ system could be restored by adding S2O32-. The N-CDs-Ag+ solution behaved as a secondary fluorescent probe to detect S2O32- in the range of 0-50 nM with an extremely low LOD of 1.5 nM. The N-CDs were successfully applied to analyze Ag+ and S2O32- in real samples with satisfactory recoveries (99.04-103.20% and 97.11-99.84%, respectively), implying good applicability in practical analysis.
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