Insight into the effect of functional groups on visible-fluorescence emissions of graphene quantum dots

Jianglin Du; Haiyu Wang; Lei Wang; Shoujun Zhu; Yubin Song; Bai Yang; Hongbo Sun

doi:10.1039/C6TC00548A

Insight into the effect of functional groups on visible-fluorescence emissions of graphene quantum dots

Jianglin Du,^a Haiyu Wang,*^a Lei Wang,^a Shoujun Zhu,^b Yubin Song,^b Bai Yang^b and Hongbo Sun^a

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* Corresponding authors

^a State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, People's Republic of China
E-mail: haiyu_wang@jlu.edu.cn

^b State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, People's Republic of China

Abstract

Graphene quantum dots (GQDs) with a variety of functional groups are studied by adjusting the pH of the solvents and through reduction using chemical methods. Our study suggests that the –CO–OH and –CO–N(CH₃)₂ groups could contribute to the green fluorescence emission (peak at 500–520 nm), and the –CO–N(CH₃)₂ group could form the green fluorescence emission state more effectively. Additionally, –OH groups and free zigzag sites may contribute to the blue fluorescence emission (peak at around 420 nm). The edge states and functional groups commonly constitute fluorescence emission centers. Additionally, both blue and green fluorescence emission centers corresponding to the molecule-like states could be quenched using the electron acceptor methyl viologen, which barely affects the intrinsic state of the carbon honeycomb flat structure.

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Publication details

The article was received on 05 Feb 2016, accepted on 15 Feb 2016 and first published on 15 Feb 2016

Article type: Paper

DOI: 10.1039/C6TC00548A

Citation: J. Mater. Chem. C, 2016,4, 2235-2242

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Insight into the effect of functional groups on visible-fluorescence emissions of graphene quantum dots

J. Du, H. Wang, L. Wang, S. Zhu, Y. Song, B. Yang and H. Sun, J. Mater. Chem. C, 2016, 4, 2235
DOI: 10.1039/C6TC00548A
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Journal of Materials Chemistry C

Insight into the effect of functional groups on visible-fluorescence emissions of graphene quantum dots

Abstract

Supplementary files

Publication details

Insight into the effect of functional groups on visible-fluorescence emissions of graphene quantum dots

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