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The synthesis of nitrogen and sulfur co-doped graphene quantum dots for fluorescence detection of cobalt(II) ions in water

Abstract

A fluorescent sensor based on nitrogen and sulfur co-doped graphene quantum dots (N,S-GQDs) has been developed for the convenient, sensitive, and selective detection of cobalt(II) ions (Co2+). Co2+ can quench the fluorescence intensity of N,S-GQDs through metal-ligand interaction between metal ions and the surface functional groups of fluorescent probe. Furthermore, the addition of Co2+ induces the aggregation of N,S-GQDs, resulting in an enhancement of UV-Visible absorption at 430 nm and color change from colorless to yellow-brown within 3 minutes. The fluorescence intensity of N,S-GQDs can be used to sense Co2+ under the optimal circumstances with a detection limit of 1.25 µM and a working linear range of 0-40 µM. In addition, the sensor probe was applied successfully to the determination of Co2+ in real water samples. Due to its has a low cytotoxicity, the proposed sensor may potentially be applied in environmental and biological fields.

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Publication details

The article was received on 19 Sep 2019, accepted on 28 Nov 2019 and first published on 29 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QM00587K
Mater. Chem. Front., 2019, Accepted Manuscript

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    The synthesis of nitrogen and sulfur co-doped graphene quantum dots for fluorescence detection of cobalt(II) ions in water

    W. Boonta, C. Talodthaisong, S. Sattayaporn, C. Chaicham, A. Chaicham, S. Sahasithiwat, L. Kangkaew and S. Kulchat, Mater. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QM00587K

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