Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite
Abstract
:1. Introduction
2. Results and Discussion
2.1. Optimization of N-CQD Synthesis Conditions
2.2. Characterization of the N-CQDs
2.3. Feasibility of N-CQDs Based Sensor for NO2−
2.3.1. Effects of pH on NO2− Detection and N-CQDs
2.3.2. Selectivity of N-CQDs Detection of NO2−
2.3.3. Sensitivity of N-CQD Detection of NO2−
2.3.4. Mechanism of Quenching
2.4. Analytical Applications
3. Materials and Methods
3.1. Chemicals/Reagents
3.2. Apparatus
3.3. Preparation of N-CQDs
3.4. NO2− Determination
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Sample Availability: Samples of the compounds are available from the authors. |
Fluorescent Probe | LOD (nM) | Linear Range (μM) | Ref. |
---|---|---|---|
CQDs-NaNO2-H2O2 | 53 | 0.1–10 | [16] |
CQDs-NaNO2-H2O2-Na2CO3 | 5 | 0.1–10 | [40] |
N-CQDs | 25 | 0.1–75 | [31] |
N-CQDs | 40 | 0.2–20 | [This work] |
Added/μM | Found/μM | Recovery/% |
---|---|---|
1.00 | 1.03 | 103 |
2.00 | 2.08 | 104 |
3.00 | 2.96 | 98.7 |
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Feng, Z.; Li, Z.; Zhang, X.; Shi, Y.; Zhou, N. Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite. Molecules 2017, 22, 2061. https://doi.org/10.3390/molecules22122061
Feng Z, Li Z, Zhang X, Shi Y, Zhou N. Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite. Molecules. 2017; 22(12):2061. https://doi.org/10.3390/molecules22122061
Chicago/Turabian StyleFeng, Zhibiao, Zeliang Li, Xingwei Zhang, Yanping Shi, and Nan Zhou. 2017. "Nitrogen-Doped Carbon Quantum Dots as Fluorescent Probes for Sensitive and Selective Detection of Nitrite" Molecules 22, no. 12: 2061. https://doi.org/10.3390/molecules22122061