Strain-driven growth of ultra-long two-dimensional nano-channels

Chao Zhu, Maolin Yu, Jiadong Zhou, Yongmin He, Qingsheng Zeng, Ya Deng, Shasha Guo, Mingquan Xu, Jinan Shi, Wu Zhou, Litao Sun, Lin Wang, Zhili Hu, Zhuhua Zhang (), Wanlin Guo () and Zheng Liu ()
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Chao Zhu: Nanyang Technological University
Maolin Yu: Nanjing University of Aeronautics and Astronautics
Jiadong Zhou: Nanyang Technological University
Yongmin He: Nanyang Technological University
Qingsheng Zeng: Nanyang Technological University
Ya Deng: Nanyang Technological University
Shasha Guo: Nanyang Technological University
Mingquan Xu: University of Chinese Academy of Sciences
Jinan Shi: University of Chinese Academy of Sciences
Wu Zhou: University of Chinese Academy of Sciences
Litao Sun: Southeast University
Lin Wang: Nanjing Tech University
Zhili Hu: Nanjing University of Aeronautics and Astronautics
Zhuhua Zhang: Nanjing University of Aeronautics and Astronautics
Wanlin Guo: Nanjing University of Aeronautics and Astronautics
Zheng Liu: Nanyang Technological University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Lateral heterostructures of two-dimensional transition metal dichalcogenides (TMDs) have offered great opportunities in the engineering of monolayer electronics, catalysis and optoelectronics. To explore the full potential of these materials, developing methods to precisely control the spatial scale of the heterostructure region is crucial. Here, we report the synthesis of ultra-long MoS2 nano-channels with several micrometer length and 2–30 nanometer width within the MoSe2 monolayers, based on intrinsic grain boundaries (GBs). First-principles calculations disclose that the strain fields near the GBs not only lead to the preferred substitution of selenium by sulfur but also drive coherent extension of the MoS2 channel from the GBs. Such a strain-driven synthesis mechanism is further shown applicable to other topological defects. We also demonstrate that the spontaneous strain of MoS2 nano-channels can further improve the hydrogen production activity of GBs, paving the way for designing GB based high-efficient TMDs in the catalytic application.

Date: 2020
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DOI: 10.1038/s41467-020-14521-8

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