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Issue 11, 2013
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Graphitic carbon quantum dots as a fluorescent sensing platform for highly efficient detection of Fe3+ ions

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Abstract

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.

Graphical abstract: Graphitic carbon quantum dots as a fluorescent sensing platform for highly efficient detection of Fe3+ ions

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Publication details

The article was received on 19 Dec 2012, accepted on 11 Jan 2013 and first published on 11 Jan 2013


Article type: Paper
DOI: 10.1039/C3RA23410J
Citation: RSC Adv., 2013,3, 3733-3738

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    Graphitic carbon quantum dots as a fluorescent sensing platform for highly efficient detection of Fe3+ ions

    Y. Zhang, L. Wang, H. Zhang, Y. Liu, H. Wang, Z. Kang and S. Lee, RSC Adv., 2013, 3, 3733
    DOI: 10.1039/C3RA23410J

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