Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1521883 | Materials Chemistry and Physics | 2014 | 5 Pages |
Abstract
A simple and effective chemical synthesis of the photoluminescent nitrogen-doped graphene quantum dots (N-GQDs) biomaterial is reported. Using the hydrothermal treatment of graphene oxide (GO) in the presence of hydrogen peroxide (H2O2) and ammonia, the N-GQDs are synthesized through H2O2 exfoliating the GO into nanocrystals with lateral dimensions and ammonia passivating the generated active surface. Then, after a dialytic separation, two water-soluble N-GQDs with average size of about 2.1Â nm/6.2Â nm, which emit green/khaki luminescence and exhibit excitation dependent/independent photoluminescence (PL) behaviors, are obtained. In addition, it is also demonstrated that these two N-GQDs are stable over a broad pH range and have the upconversion PL property, showing this approach provides a simple and effective method to synthesize the functional N-GQDs.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Xiaohua Zhu, Xiaoxi Zuo, Ruiping Hu, Xin Xiao, Yong Liang, Junmin Nan,