Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots

	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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