Journal
RSC ADVANCES
Volume 3, Issue 11, Pages 3733-3738Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra23410j
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Funding
- National Basic Research Program of China (973 Program) [2012CB825800, 2013CB932702]
- National Natural Science Foundation of China (NSFC) [51132006, 21073127, 21071104]
- Foundation for the Author of National Excellent Doctoral Dissertation of China (FANEDD) [200929]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Suzhou Planning Project of Science and Technology [ZXG2012028]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [11KJB150015]
- Hong Kong Scholar Program [XJ2011014]
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Reported here is a green synthesis of graphitic carbon quantum dots (GCQDs) as a fluorescent sensing platform for the highly sensitive and selective detection of Fe3+ ions. Through the electrochemical ablation of graphite electrodes in ultrapure water, uniform GCQDs with graphitic crystallinity and oxygen containing groups on their surfaces have been successfully prepared. The absence of acid, alkali, salt and organic compounds in the starting materials effectively avoids complex purification procedures and environmental contamination, leading to a green and sustainable synthesis of GCQDs. The oxygen functional groups (e. g., hydroxyl, carboxyl) contribute to the water solubility and strong interaction with metal ions, which enable the GCQDs to serve as a fluorescent probe for the highly sensitive and selective detection of Fe3+ ions with a detection limit as low as 2 nM. The high sensitivity of our GCQDs could be attributed to the formation of complexes between Fe3+ ions and the phenolic hydroxyls of GCQDs. The fluorescence lifetime of GCQDs in the presence and absence of Fe3+ was tested by time-correlated single-photon counting (TCSPC), which confirmed a dynamic fluorescence quenching mechanism.
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