title: 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 Fe(3+) ions, which was proved by the Stern-Volmer equation, temperature dependent quenching and fluorescence lifetime measurements. Furthermore, a hemin sensor based on the Fe(3+)/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/Fe(2+) 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.
authors.affiliation: State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China. byangchem@jlu.edu.cn.
authors.forename: Yubin
authors.initials: Y
authors.lastname: Song
authors.forename: Shoujun
authors.initials: S
authors.lastname: Zhu
authors.forename: Siyuan
authors.initials: S
authors.lastname: Xiang
authors.forename: Xiaohuan
authors.initials: X
authors.lastname: Zhao
authors.forename: Junhu
authors.initials: J
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Fu
authors.forename: Bai
authors.initials: B
authors.lastname: Yang