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

Qu, Dan ; Zheng, Min ; Zhang, Ligong ; Zhao, Haifeng ; Xie, Zhigang ; Jing, Xiabin ; Haddad, Raid E ; Fan, Hongyou ; Sun, Zaicheng

Scientific reports, 2014-06, Vol.4 (1), p.5294-5294, Article 5294 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    Formation mechanism and optimization of highly luminescent N-doped graphene quantum dots
  • Autor: Qu, Dan ; Zheng, Min ; Zhang, Ligong ; Zhao, Haifeng ; Xie, Zhigang ; Jing, Xiabin ; Haddad, Raid E ; Fan, Hongyou ; Sun, Zaicheng
  • Assuntos: Carbon sources ; Citric acid ; Ethylene ; Graphite ; NANOPARTICLES ; NANOSCIENCE AND NANOTECHNOLOGY ; Optical properties ; PHOTOCATALYSIS ; Quantum dots ; Science & Technology - Other Topics ; Urea
  • É parte de: Scientific reports, 2014-06, Vol.4 (1), p.5294-5294, Article 5294
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    AC04-94AL85000
    USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
  • Descrição: 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.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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