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Facile Synthetic Method for Pristine Graphene Quantum Dots and Graphene Oxide Quantum Dots: Origin of Blue and Green Luminescence

Authors

  • Fei Liu,

    1. Department of Chemical and Biomolecular, Engineering (BK21 program) and Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Min-Ho Jang,

    1. Department of Physics, Graduate School of Nanoscience & Technology (WCU) and Graphene Research Center of KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
    Current affiliation:
    1. These authors contributed equally to this work.
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  • Hyun Dong Ha,

    1. Department of Chemical and Biomolecular, Engineering (BK21 program) and Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
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  • Je-Hyung Kim,

    1. Department of Physics, Graduate School of Nanoscience & Technology (WCU) and Graphene Research Center of KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
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  • Yong-Hoon Cho,

    Corresponding author
    1. Department of Physics, Graduate School of Nanoscience & Technology (WCU) and Graphene Research Center of KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
    • Department of Physics, Graduate School of Nanoscience & Technology (WCU) and Graphene Research Center of KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
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  • Tae Seok Seo

    Corresponding author
    1. Department of Chemical and Biomolecular, Engineering (BK21 program) and Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
    • Department of Chemical and Biomolecular, Engineering (BK21 program) and Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
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Abstract

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Pristine graphene quantum dots and graphene oxide quantum dots are synthesized by chemical exfoliation from the graphite nanoparticles with high uniformity in terms of shape (circle), size (less than 4 nm), and thickness (monolayer). The origin of the blue and green photoluminescence of GQDs and GOQDs is attributed to intrinsic and extrinsic energy states, respectively.

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