Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 521, Issue -, Pages 33-41Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.03.021
Keywords
Nitrogen-doped carbon dots; Multicolor fluorescence; High quantum yield; Concentration-dependent fluorescence; Biosensing and cellular imaging
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Funding
- National Natural Science Foundation of China [51502115]
- Public Health Research Center at Jiangnan University [JUPH201506]
- open project of state key laboratory of supramolecular structure and materials [sklssm201819]
- Fundamental Research Funds for the Central Universities [JUSRP11708]
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Nitrogen doping can effectly adjust the compositions and structures of carbon dots and hence enhance their fluorescence. In this work, we report a fast and low-cost route for synthesis of nitrogen-doped carbon dots (N-CDs) by microwave pyrolysis of citric acid and ammonium within 7 min. The as-prepared N-CDs contain plentiful oxygen and nitrogen functional groups, and dispaly intense fluorescence with high quantum yield of ca. 44.3% and have an average size of 1.8 nm. The obtained N-CDs exhibit highly stable against photobleaching, ionic strengths, and can be used for selective and sensitive detection of Fe(III). It is postulated that the Fe3+-mediated fluorescence quenching is attributed to the charge transfer between N-CDs and Fe3+. In particular, the emission peaks from blue to red region can be tuned by interparticle distance of N-CDs, simply by increasing the concentration of N-CDs in aqueous solution, which indicates its potential applications as a promising optical image probe in multicolor cellular imaging. (C) 2018 Elsevier Inc. All rights reserved.
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