Changchun Institute of Optics,Fine Mechanics and Physics,CAS
Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots | |
Qu D.; Zheng M.; Zhang L. G.; Zhao H. F.; Xie Z. G.; Jing X. B.; Haddad R. E.; Fan H. Y.; Sun Z. C. | |
2014 | |
发表期刊 | Scientific Reports |
ISSN | ISBN/2045-2322 |
卷号 | 4期号:9 |
摘要 | Photoluminescent graphene quantum dots (GQDs) have received enormous attention because of their unique chemical, electronic and optical properties. Here a series of GQDs were synthesized under hydrothermal processes in order to investigate the formation process and optical properties of N-doped GQDs. Citric acid (CA) was used as a carbon precursor and self-assembled into sheet structure in a basic condition and formed N-free GQD graphite framework through intermolecular dehydrolysis reaction. N-doped GQDs were prepared using a series of N-containing bases such as urea. Detailed structural and property studies demonstrated the formation mechanism of N-doped GQDs for tunable optical emissions. Hydrothermal conditions promote formation of amide between -NH2 and -COOH with the presence of amine in the reaction. The intramoleculur dehydrolysis between neighbour amide and COOH groups led to formation of pyrrolic N in the graphene framework. Further, the pyrrolic N transformed to graphite N under hydrothermal conditions. N-doping results in a great improvement of PL quantum yield (QY) of GQDs. By optimized reaction conditions, the highest PL QY (94%) of N-doped GQDs was obtained using CA as a carbon source and ethylene diamine as a N source. The obtained N-doped GQDs exhibit an excitation-independent blue emission with single exponential lifetime decay. |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ciomp.ac.cn/handle/181722/44003 |
专题 | 中科院长春光机所知识产出 |
推荐引用方式 GB/T 7714 | Qu D.,Zheng M.,Zhang L. G.,et al. Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots[J]. Scientific Reports,2014,4(9). |
APA | Qu D..,Zheng M..,Zhang L. G..,Zhao H. F..,Xie Z. G..,...&Sun Z. C..(2014).Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots.Scientific Reports,4(9). |
MLA | Qu D.,et al."Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots".Scientific Reports 4.9(2014). |
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