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Nano Research

, Volume 12, Issue 4, pp 947–954 | Cite as

Direct observation of epitaxial alignment of Au on MoS2 at atomic resolution

  • Yinghui Sun
  • Haofei Zhao
  • Dan Zhou
  • Yuchen Zhu
  • Huanyu Ye
  • Yan Aung Moe
  • Rongming WangEmail author
Research Article
  • 79 Downloads

Abstract

The morphology and structural stability of metal/2D semiconductor interfaces strongly affect the performance of 2D electronic devices and synergistic catalysis. However, the structural evolution at the interfaces has not been well explored particularly at atomic resolution. In this work, we study the structural evolution of Au nanoparticles (NPs) on few-layer MoS2 by high resolution transmission electron microscope (HRTEM) and quantitative high-angle annular dark field scanning TEM. It is found that in the transition of Au from nanoparticles to dendrites, a dynamically epitaxial alignment between Au and MoS2 lattices is formed, and Moiré patterns can be directly observed in HRTEM images due to the mismatch between Au and MoS2 lattices. This epitaxial alignment can occur in ambient conditions, and can also be accelerated by the irradiation of high-energy electron beam. In situ observation clearly reveals the rotation of Au NPs, the atom migration inside Au NPs, and the transfer of Au atoms between neighboring Au NPs, finally leading to the formation of epitaxially aligned Au dendrites on MoS2. The structural evolution of metal/2D semiconductor interfaces at atomic scale can provide valuable information for the design and fabrication of the metal/2D semiconductor nano-devices with desired physical and chemical performances.

Keywords

atom migration MoS2 in situ TEM metal-semiconductor interface Moiré patterns 

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Notes

Acknowledgements

The authors thank Fangtao Li, Hongsheng Fan, and Sibin Duan for helpful discussions. This work was supported by the National Natural Science Foundation of China (Nos. 11604010 and 11674023), 111 Project (No. B170003), and the Fundamental Research Funds for the Central Universities (No. FRF-BD-18-004A).

Supplementary material

12274_2019_2329_MOESM1_ESM.pdf (5.4 mb)
Direct observation of epitaxial alignment of Au on MoS2 at atomic resolution

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yinghui Sun
    • 1
  • Haofei Zhao
    • 1
  • Dan Zhou
    • 2
  • Yuchen Zhu
    • 1
  • Huanyu Ye
    • 1
  • Yan Aung Moe
    • 1
  • Rongming Wang
    • 1
    Email author
  1. 1.Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijingChina
  2. 2.Stuttgart Center for Electron MicroscopyMax Planck Institute for Solid State ResearchStuttgartGermany

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