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High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide

Author

Listed:
  • Jian Zheng

    (National University of Singapore, 3 Science Drive 3)

  • Han Zhang

    (National University of Singapore, 3 Science Drive 3)

  • Shaohua Dong

    (National University of Singapore, 3 Science Drive 3)

  • Yanpeng Liu

    (National University of Singapore, 3 Science Drive 3)

  • Chang Tai Nai

    (National University of Singapore, 3 Science Drive 3)

  • Hyeon Suk Shin

    (Interdisciplinary School of Green Energy and Low Dimensional Carbon Materials Center, UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50)

  • Hu Young Jeong

    (Interdisciplinary School of Green Energy and Low Dimensional Carbon Materials Center, UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50)

  • Bo Liu

    (National University of Singapore, 3 Science Drive 3)

  • Kian Ping Loh

    (National University of Singapore, 3 Science Drive 3)

Abstract

Transition-metal dichalcogenides like molybdenum disulphide have attracted great interest as two-dimensional materials beyond graphene due to their unique electronic and optical properties. Solution-phase processes can be a viable method for producing printable single-layer chalcogenides. Molybdenum disulphide can be exfoliated into monolayer flakes using organolithium reduction chemistry; unfortunately, the method is hampered by low yield, submicron flake size and long lithiation time. Here we report a high-yield exfoliation process using lithium, potassium and sodium naphthalenide where an intermediate ternary LixMXn crystalline phase (X=selenium, sulphur, and so on) is produced. Using a two-step expansion and intercalation method, we produce high-quality single-layer molybdenum disulphide sheets with unprecedentedly large flake size, that is up to 400 μm2. Single-layer dichalcogenide inks prepared by this method may be directly inkjet-printed on a wide range of substrates.

Suggested Citation

  • Jian Zheng & Han Zhang & Shaohua Dong & Yanpeng Liu & Chang Tai Nai & Hyeon Suk Shin & Hu Young Jeong & Bo Liu & Kian Ping Loh, 2014. "High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide," Nature Communications, Nature, vol. 5(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms3995
    DOI: 10.1038/ncomms3995
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    Cited by:

    1. Hongzheng Dong & Xiangyu Pan & Yuancai Gong & Mengfan Xue & Pin Wang & SocMan Ho-Kimura & Yingfang Yao & Hao Xin & Wenjun Luo & Zhigang Zou, 2023. "Potential window alignment regulating ion transfer in faradaic junctions for efficient photoelectrocatalysis," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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