Issue 9, 2014

Investigation into the fluorescence quenching behaviors and applications of carbon dots

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

Supplementary files

Article information

Article type
Paper
Submitted
02 Jan 2014
Accepted
06 Feb 2014
First published
07 Feb 2014

Nanoscale, 2014,6, 4676-4682

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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