Ultrafast ammonia-driven, microwave-assisted synthesis of nitrogen-doped graphene quantum dots and their optical properties

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DOI

  • Binjie Zheng, Univ Elect Sci & Technol China, University of Electronic Science & Technology of China, State Key Lab Elect Thin Films & Integrated Devic
  • ,
  • Yuanfu Chen, Univ Elect Sci & Technol China, University of Electronic Science & Technology of China, State Key Lab Elect Thin Films & Integrated Devic
  • ,
  • Pingjian Li, Univ Elect Sci & Technol China, University of Electronic Science & Technology of China, State Key Lab Elect Thin Films & Integrated Devic
  • ,
  • Zegao Wang
  • ,
  • Bingqiang Cao, Univ Jinan, University of Jinan, Sch Mat Sci & Engn
  • ,
  • Fei Qi, Univ Elect Sci & Technol China, University of Electronic Science & Technology of China, State Key Lab Elect Thin Films & Integrated Devic
  • ,
  • Jinbo Liu, Univ Elect Sci & Technol China, University of Electronic Science & Technology of China, State Key Lab Elect Thin Films & Integrated Devic
  • ,
  • Zhiwen Qiu, Univ Jinan, University of Jinan, Sch Mat Sci & Engn
  • ,
  • Wanli Zhang, Univ Elect Sci & Technol China, University of Electronic Science & Technology of China, State Key Lab Elect Thin Films & Integrated Devic

For the first time, a facile, ultrafast, ammoniadriven microwave-assisted synthesis of high-quality nitrogen-doped graphene quantum dots (NGQDs) at room temperature and atmospheric pressure is presented. This one-step method is very cheap, environment friendly, and suitable for large-scale production. The as-synthesized NGQDs consisting of one to three graphene monolayers exhibit highly crystalline quality with an average size of 5.3 nm. A new fluorescence (FL) emission peak at 390 nm is observed, which might be attributed to the doped nitrogen atoms into the GQDs. An interesting red-shift is observed by comparing the FL excitation spectra to the UV-visible absorption spectra. Based on the optical properties, the detailed Jablonski diagram representing the energy level structure of NGQDs is derived.

Original languageEnglish
JournalNanophotonics
Volume6
Issue1
Pages (from-to)259-267
Number of pages9
ISSN2192-8606
DOIs
Publication statusPublished - Jan 2017

    Research areas

  • nitrogen-doped, graphene quantum dots, ultrafast synthesis, fluorescence nanophotonics, ONE-POT SYNTHESIS, DEEP-ULTRAVIOLET, AQUEOUS-MEDIA, CARBON, IONS, PHOTOLUMINESCENCE, FLUORESCENCE, OXIDE

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