Portal de Periódicos da CAPES

Investigation into the fluorescence quenching behaviors and applications of carbon dots

2014; Royal Society of Chemistry; Volume: 6; Issue: 9 Linguagem: Inglês

10.1039/c4nr00029c

2040-3372

Yubin Song, Shoujun Zhu, Siyuan Xiang, Xiaohuan Zhao, Junhu Zhang, Hao Zhang, Yu Fu, Bai Yang,

Quantum Dots Synthesis And Properties

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.