Issue 24, 2013

Large scale preparation of graphenequantum dots from graphite with tunable fluorescence properties

Abstract

We report an improved Hummers method for synthesizing graphene quantum dots (GQDs) by directly oxidizing and etching graphite powders. The yield of GQDs is as high as 63 ± 7% (by weight, wt%), suggesting this technique is suitable for producing GQDs on a large scale. The GQDs are nanocrystals with lateral dimensions in the range of 2–4 nm and an average thickness of around 1.3 nm. The emission peaks of as-prepared GQDs can be tuned in the range of 440 to 510 nm by varying the reaction conditions. Their fluorescence quantum yields were tested to be around 1%, which could be further increased to about 3% by hydrothermal treatment. These GQDs have low cytotoxicity and excellent biocompatibility, indicating that they are promising for biological applications.

Graphical abstract: Large scale preparation of graphene quantum dots from graphite with tunable fluorescence properties

Supplementary files

Article information

Article type
Paper
Submitted
15 Feb 2013
Accepted
23 Apr 2013
First published
24 Apr 2013

Phys. Chem. Chem. Phys., 2013,15, 9907-9913

Large scale preparation of graphene quantum dots from graphite with tunable fluorescence properties

Y. Sun, S. Wang, C. Li, P. Luo, L. Tao, Y. Wei and G. Shi, Phys. Chem. Chem. Phys., 2013, 15, 9907 DOI: 10.1039/C3CP50691F

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