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Issue 9, 2014
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Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots

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Abstract

Strong blue luminescence and water-soluble nitrogen (N) and sulfur (S) co-doped graphene quantum dots (NS-GQDs) were fabricated via a one-step hydrothermal method using oxidized graphene. Ammonia and powdered S were selected as the source of N and S, respectively. The results indicated that both N and S atoms were successfully incorporated into the sp2-hybridized carbon framework of graphene. Under the excitation of 365 nm, the maximum emission intensity could be obtained with a 1 : 1.2 atomic ratio of N/S. The as-prepared NS-GQDs exhibited brighter luminescence compared with N-doped graphene quantum dots (N-GQDs). S-doping plays an important role in enhancing the emission intensity of NS-GQDs. In addition, the luminescence was exceptionally resistant to high salt concentration. Because of these virtues, there are extensive potential applications for NS-GQDs in bio-imaging, solar cells, and ion detection.

Graphical abstract: Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots

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Supplementary files

Article information


Submitted
11 Jun 2014
Accepted
03 Jul 2014
First published
03 Jul 2014

New J. Chem., 2014,38, 4615-4621
Article type
Paper
Author version available

Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots

B. Zhang, H. Gao and X. Li, New J. Chem., 2014, 38, 4615
DOI: 10.1039/C4NJ00965G

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