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

doi:10.1038/srep05294

CORC > 化学研究所 > 中国科学院化学研究所

	Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots
	Qu, Dan 1,3; Zheng, Min 1; Zhang, Ligong 1; Zhao, Haifeng 1; Xie, Zhigang 2; Jing, Xiabin 2; Haddad, Raid E.4; Fan, Hongyou 4,5; Sun, Zaicheng 1
刊名	SCIENTIFIC REPORTS
	2014-06-17
卷号	4
ISSN号	2045-2322
DOI	10.1038/srep05294
英文摘要	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.
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000337342700001
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/51231]
专题	中国科学院化学研究所
通讯作者	Fan, Hongyou
作者单位	1.Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, Jilin, Peoples R China 2.Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100000, Peoples R China 4.Univ New Mexico, Ctr Microengn & Mat, Dept Chem & Nucl Engn, Albuquerque, NM 87106 USA 5.Sandia Natl Labs, Adv Mat Lab, Albuquerque, NM 87106 USA
推荐引用方式 GB/T 7714	Qu, Dan,Zheng, Min,Zhang, Ligong,et al. Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots[J]. SCIENTIFIC REPORTS,2014,4.
APA	Qu, Dan.,Zheng, Min.,Zhang, Ligong.,Zhao, Haifeng.,Xie, Zhigang.,...&Sun, Zaicheng.(2014).Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots.SCIENTIFIC REPORTS,4.
MLA	Qu, Dan,et al."Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots".SCIENTIFIC REPORTS 4(2014).