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Issue 9, 2019
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Electrochemical synthesis of multicolor fluorescent N-doped graphene quantum dots as a ferric ion sensor and their application in bioimaging

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Abstract

A novel electrochemical strategy for simple and facile synthesis of semicarbazide functionalized nitrogen-doped graphene quantum dots (N-GQDs) was reported, based on direct exfoliation and oxidation from graphite rods. The average diameter of the as-synthesized N-GQDs is about 20 nm, and their dispersion is bright yellow due to the rich nitrogen and oxygen functional groups on their surface. The N-GQD dispersion was further applied in the selective detection of ferric ions (Fe3+) based on the photoluminescence (PL) quenching of N-GQDs after adding Fe3+. The fluorescent sensor has a wide linear range of 0–200 μM and a detection limit of 0.87 μM, which is much lower than the maximum level (0.3 mg L−1, equivalent to 5.4 μM) of Fe3+ permitted in drinking water by the U.S. Environmental Protection Agency (EPA). Moreover, these novel N-GQDs exhibit much wider emission bands, which extend into the entire visible region, and emit three primary color fluorescence independently. This distinctive behavior of the as-prepared GQDs not only breaks the limitation that traditional reported GQDs only exhibit blue emission in the short-wavelength region, but may also provide a new research platform for further applications of GQDs in real environmental detection and biological imaging systems.

Graphical abstract: Electrochemical synthesis of multicolor fluorescent N-doped graphene quantum dots as a ferric ion sensor and their application in bioimaging

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Supplementary files

Article information


Submitted
24 Nov 2018
Accepted
28 Jan 2019
First published
12 Feb 2019

J. Mater. Chem. B, 2019,7, 1494-1502
Article type
Paper

Electrochemical synthesis of multicolor fluorescent N-doped graphene quantum dots as a ferric ion sensor and their application in bioimaging

Y. Fu, G. Gao and J. Zhi, J. Mater. Chem. B, 2019, 7, 1494
DOI: 10.1039/C8TB03103G

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