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Structure and exfoliation mechanism of two-dimensional boron nanosheets

Author

Listed:
  • Jing-Yang Chung

    (National University of Singapore
    National University of Singapore)

  • Yanwen Yuan

    (National University of Singapore
    National University of Singapore)

  • Tara P. Mishra

    (National University of Singapore)

  • Chithralekha Joseph

    (National University of Singapore)

  • Pieremanuele Canepa

    (National University of Singapore)

  • Pranay Ranjan

    (Indian Institute of Technology Jodhpur)

  • El Hadi S. Sadki

    (United Arab Emirates University)

  • Silvija Gradečak

    (National University of Singapore
    National University of Singapore)

  • Slaven Garaj

    (National University of Singapore
    National University of Singapore
    National University of Singapore)

Abstract

Exfoliation of two-dimensional (2D) nanosheets from three-dimensional (3D) non-layered, non-van der Waals crystals represents an emerging strategy for materials engineering that could significantly increase the library of 2D materials. Yet, the exfoliation mechanism in which nanosheets are derived from crystals that are not intrinsically layered remains unclear. Here, we show that planar defects in the starting 3D boron material promote the exfoliation of 2D boron sheets—by combining liquid-phase exfoliation, aberration-corrected scanning transmission electron microscopy, Raman spectroscopy, and density functional theory calculations. We demonstrate that 2D boron nanosheets consist of a planar arrangement of icosahedral sub-units cleaved along the {001} planes of β-rhombohedral boron. Correspondingly, intrinsic stacking faults in 3D boron form parallel layers of faulted planes in the same orientation as the exfoliated nanosheets, reducing the {001} cleavage energy. Planar defects represent a potential engineerable pathway for exfoliating 2D sheets from 3D boron and, more broadly, the other covalently bonded materials.

Suggested Citation

  • Jing-Yang Chung & Yanwen Yuan & Tara P. Mishra & Chithralekha Joseph & Pieremanuele Canepa & Pranay Ranjan & El Hadi S. Sadki & Silvija Gradečak & Slaven Garaj, 2024. "Structure and exfoliation mechanism of two-dimensional boron nanosheets," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49974-8
    DOI: 10.1038/s41467-024-49974-8
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    References listed on IDEAS

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    1. Zhimi Hu & Xu Xiao & Huanyu Jin & Tianqi Li & Ming Chen & Zhun Liang & Zhengfeng Guo & Jia Li & Jun Wan & Liang Huang & Yanrong Zhang & Guang Feng & Jun Zhou, 2017. "Rapid mass production of two-dimensional metal oxides and hydroxides via the molten salts method," Nature Communications, Nature, vol. 8(1), pages 1-9, August.
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