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Research Article

Tuning bandstructure of folded MoS2 through fluid dynamics

Zihan Zhao1,2,§, Weifeng Zhang2,§, Yan Zhang2, He Hao2, Shishu Zhang3, Lianming Tong3, Banghua Peng1( ), Nan Liu2( )
School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China
Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China
Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

§Zihan Zhao and Weifeng Zhang contributed equally to this work.

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Graphical Abstract

Abstract

The variation of interlayer coupling can greatly affect the bandstructure of few layered transition metal dichalcogenides (TMDs), for instance, transition of indirect-to-direct bandgap and vice versa, which is correlated with the charge carrier and optical density. However, methods that can modulate the coupling strength in a controllable way are still lacking. Here, we report a fluidic dynamic strategy to tune the interlayer coupling of folded bi-layer MoS2. By controlling the flow direction and particle size of the fluid, mono-layer MoS2 can be folded into bi-layer with a controlled folding direction for designated twist angles as well as tunable interlayer coupling. Compared with normally folded bi-layer MoS2, the photoluminescence (PL) peak of the direct-bandgap transition for folded bi-layer MoS2 by fluid flow is weakened accompanied with the re-appearance of indirect-bandgap transition peak. Besides, the fluid flow creates a clear trajectory on the folded MoS2, exhibiting various degrees of interlayer coupling along it. Field-effect transistors (FETs) were further fabricated on tunably coupled folded-bi-layers, proving that the bandstructure and electrical property is strongly correlated with the degree of interlayer coupling. This fluidic dynamic strategy can be extended to other TMDs on any substrate, and together with its excellent capability in controlled interlayer coupling, it will provide a new way for the development of TMDs optoelectronics.

Keywords

molybdenum disulfidefoldinginterlayer couplingfluidic dynamicsphotoluminescence (PL)bandstructure

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Nano Research
Volume 15 Issue 3,
March 2022
Pages 2734-2740
DOI: 10.1007/s12274-021-3768-2
Cite this article:
Zhao Z, Zhang W, Zhang Y, et al. Tuning bandstructure of folded MoS2 through fluid dynamics. Nano Research, 2022, 15(3): 2734-2740. https://doi.org/10.1007/s12274-021-3768-2
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Received: 09 May 2021
Revised: 30 June 2021
Accepted: 27 July 2021
Published: 19 August 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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