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Direct observation of cation diffusion driven surface reconstruction at van der Waals gaps

Author

Listed:
  • Wenjun Cui

    (Wuhan University of Technology
    Wuhan University of Technology)

  • Weixiao Lin

    (Wuhan University of Technology
    Wuhan University of Technology)

  • Weichao Lu

    (Wuhan University of Technology
    Wuhan University of Technology)

  • Chengshan Liu

    (Wuhan University of Technology)

  • Zhixiao Gao

    (China University of Petroleum (East China))

  • Hao Ma

    (China University of Petroleum (East China))

  • Wen Zhao

    (China University of Petroleum (East China))

  • Gustaaf Tendeloo

    (Wuhan University of Technology
    University of Antwerp)

  • Wenyu Zhao

    (Wuhan University of Technology)

  • Qingjie Zhang

    (Wuhan University of Technology)

  • Xiahan Sang

    (Wuhan University of Technology
    Wuhan University of Technology)

Abstract

Weak interlayer van der Waals (vdW) bonding has significant impact on the surface/interface structure, electronic properties, and transport properties of vdW layered materials. Unraveling the complex atomistic dynamics and structural evolution at vdW surfaces is therefore critical for the design and synthesis of the next-generation vdW layered materials. Here, we show that Ge/Bi cation diffusion along the vdW gap in layered GeBi2Te4 (GBT) can be directly observed using in situ heating scanning transmission electron microscopy (STEM). The cation concentration variation during diffusion was correlated with the local Te6 octahedron distortion based on a quantitative analysis of the atomic column intensity and position in time-elapsed STEM images. The in-plane cation diffusion leads to out-of-plane surface etching through complex structural evolutions involving the formation and propagation of a non-centrosymmetric GeTe2 triple layer surface reconstruction on fresh vdW surfaces, and GBT subsurface reconstruction from a septuple layer to a quintuple layer. Our results provide atomistic insight into the cation diffusion and surface reconstruction in vdW layered materials.

Suggested Citation

  • Wenjun Cui & Weixiao Lin & Weichao Lu & Chengshan Liu & Zhixiao Gao & Hao Ma & Wen Zhao & Gustaaf Tendeloo & Wenyu Zhao & Qingjie Zhang & Xiahan Sang, 2023. "Direct observation of cation diffusion driven surface reconstruction at van der Waals gaps," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-35972-9
    DOI: 10.1038/s41467-023-35972-9
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    1. Meiling Chen & Wenhao Liu & Pengcheng Ding & Fengwu Guo & Zhuo Li & Yanghan Chen & Wei Yi & Ye Sun & Jianchen Lu & Lev Kantorovich & Miao Yu, 2025. "Semiconductor-to-metal surface reconstruction in copper selenide/copper heterostructures steered by photoinduced interlayer atom migration," Nature Communications, Nature, vol. 16(1), pages 1-8, December.

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