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Issue 9, 2014
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Investigation into the fluorescence quenching behaviors and applications of carbon dots

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Abstract

Carbon dots (CDs) are novel fluorescent materials with low toxicity and good biocompatibility. Herein, the collisional/dynamic and photoluminescence (PL) center destruction quenching behaviors of a novel type of CDs were investigated. Moreover, the quenching behaviors of the CDs were exploited in applications. Firstly, dynamic PL quenching was achieved by Fe3+ ions, which was proved by the Stern–Volmer equation, temperature dependent quenching and fluorescence lifetime measurements. Furthermore, a hemin sensor based on the Fe3+/CDs system was achieved. Secondly, quenching induced by PL center destruction was caused by hydroxyl radicals (˙OH), which were produced by high power UV light or the H2O2/Fe2+ system; thus an H2O2 sensor with a low detection limit (0.9 ppb) was realized. Finally, we assumed that the CDs are really composed of cross-linked molecular clusters, and that the PL centers of the as prepared CDs are certain molecular/chemical groups.

Graphical abstract: Investigation into the fluorescence quenching behaviors and applications of carbon dots

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Publication details

The article was received on 02 Jan 2014, accepted on 06 Feb 2014 and first published on 07 Feb 2014


Article type: Paper
DOI: 10.1039/C4NR00029C
Nanoscale, 2014,6, 4676-4682

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    Investigation into the fluorescence quenching behaviors and applications of carbon dots

    Y. Song, S. Zhu, S. Xiang, X. Zhao, J. Zhang, H. Zhang, Y. Fu and B. Yang, Nanoscale, 2014, 6, 4676
    DOI: 10.1039/C4NR00029C

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