Facile synthesis of yellow fluorescent carbon dots for highly sensitive sensing of cobalt ions and biological imaging

Literature Information

Publication Date 2019-07-25
DOI 10.1039/C9AY01244C
Impact Factor 2.896
Authors

Min Tian, Yaoming Liu, Yingte Wang, Yong Zhang


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Abstract

Long-wavelength light emission has been garnering extensive attention in terms of strong tissue penetration ability and weak light scattering effects. Herein, nitrogen-doped carbon dots (N-CDs) with bright yellow fluorescence emission at 555 nm are facilely synthesized through hydrothermal-assisted heating of o-phenylenediamine and urea. The as-prepared N-CDs exhibit low cytotoxicity, high biocompatibility, photobleaching resistance, and multiple functional groups. Based on the formation of a stable non-fluorescent ground-state complex, the fluorescence intensity of N-CDs is linearly quenched by Co2+ in the range of 0.1–30 μM and the detection limit is as low as 52 nM. The method has been successfully applied for precise analysis of actual samples. Furthermore, the N-CDs satisfactorily serve as a staining probe for the in vivo bioimaging of zebrafish.

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