Journal
NANOPHOTONICS
Volume 6, Issue 1, Pages 259-267Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2016-0102
Keywords
nitrogen-doped; graphene quantum dots; ultrafast synthesis; fluorescence nanophotonics
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Funding
- Fundamental Research Funds for the Central Universities [ZYGX2013Z001]
- National Natural Science Foundation of China [51202022, 51372033, 61378028]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120185120011]
- National High Technology Research and Development Program of China [2015AA034202]
- China Electronics Technology Group Corporation of Innovative Project [62401110311]
- 111 Project [B13042]
- Sichuan Youth Science and Technology Innovation Research Team Funding [2011JTD0006]
- International Science and Technology Cooperation Program of China [2012DFA51430]
- Sino-German Cooperation PPP Program of China
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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.
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