Journal
NEW JOURNAL OF CHEMISTRY
Volume 41, Issue 19, Pages 11125-11137Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj00505a
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Funding
- Fundamental Research Funds for the Central Universities [JUSRP11517]
- Youth Natural Science Foundation of Jiangsu Province [BK20150401]
- Wuxi Administration of Science and Technology Project [CSE31N1509]
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In this study, N and S co-doped carbon dots (N, S-CDs) were synthesized from biomass, using sulfamic acid as a passivator. The N, S-CDs have satisfying fluorescence properties with a quantum yield of 24.1%. It has been shown that the N, S-CDs have low cytotoxicity and can be used as multicolor probes for cell imaging. In addition, the N, S-CDs have excellent antioxidant abilities for scavenging DPPH free radicals, hydroxyl free radicals and superoxide anion free radicals. Moreover, the fluorescence of the N, S-CDs can be quenched by Cr(VI) because of the inner filter effect (IFE). Accordingly, the fluorescence response for this Cr(VI) assay leads to a broad linear range of 1 to 200 mu M, associated with a limit of detection of 0.76 mu M. Furthermore, this N, S-CD-based fluorescence platform for Cr(VI) detection was successfully applied in real lake water, human serum and living cells.
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