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Gram-scale synthesis of single-crystalline graphene quantum dots with superior optical properties

Author

Listed:
  • Liang Wang

    (Institute of Nanochemistry and Nanobiology, Shanghai University)

  • Yanli Wang

    (Institute of Nanochemistry and Nanobiology, Shanghai University)

  • Tao Xu

    (SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University)

  • Haobo Liao

    (Institute of Nanochemistry and Nanobiology, Shanghai University)

  • Chenjie Yao

    (Institute of Nanochemistry and Nanobiology, Shanghai University)

  • Yuan Liu

    (Institute of Nanochemistry and Nanobiology, Shanghai University)

  • Zhen Li

    (Shanghai Applied Radiation Institute, Shanghai University)

  • Zhiwen Chen

    (Shanghai Applied Radiation Institute, Shanghai University)

  • Dengyu Pan

    (Institute of Nanochemistry and Nanobiology, Shanghai University)

  • Litao Sun

    (SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University)

  • Minghong Wu

    (Shanghai Applied Radiation Institute, Shanghai University)

Abstract

Graphene quantum dots (GQDs) have various alluring properties and potential applications, but their large-scale applications are limited by current synthetic methods that commonly produce GQDs in small amounts. Moreover, GQDs usually exhibit polycrystalline or highly defective structures and thus poor optical properties. Here we report the gram-scale synthesis of single-crystalline GQDs by a facile molecular fusion route under mild and green hydrothermal conditions. The synthesis involves the nitration of pyrene followed by hydrothermal treatment in alkaline aqueous solutions, where alkaline species play a crucial role in tuning their size, functionalization and optical properties. The single-crystalline GQDs are bestowed with excellent optical properties such as bright excitonic fluorescence, strong excitonic absorption bands extending to the visible region, large molar extinction coefficients and long-term photostability. These high-quality GQDs can find a large array of novel applications in bioimaging, biosensing, light emitting diodes, solar cells, hydrogen production, fuel cells and supercapacitors.

Suggested Citation

  • Liang Wang & Yanli Wang & Tao Xu & Haobo Liao & Chenjie Yao & Yuan Liu & Zhen Li & Zhiwen Chen & Dengyu Pan & Litao Sun & Minghong Wu, 2014. "Gram-scale synthesis of single-crystalline graphene quantum dots with superior optical properties," Nature Communications, Nature, vol. 5(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6357
    DOI: 10.1038/ncomms6357
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    1. Ettefaghi, Ehsanollah & Ghobadian, Barat & Rashidi, Alimorad & Najafi, G. & Khoshtaghaza, Mohammad Hadi & Rashtchi, Maryam & Sadeghian, Sina, 2018. "A novel bio-nano emulsion fuel based on biodegradable nanoparticles to improve diesel engines performance and reduce exhaust emissions," Renewable Energy, Elsevier, vol. 125(C), pages 64-72.
    2. Wanlin Zhou & Hui Su & Weiren Cheng & Yuanli Li & Jingjing Jiang & Meihuan Liu & Feifan Yu & Wei Wang & Shiqiang Wei & Qinghua Liu, 2022. "Regulating the scaling relationship for high catalytic kinetics and selectivity of the oxygen reduction reaction," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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