Enhanced Second-Order Nonlinearities at Strained Ultrasharp Zigzag Edges in Multilayer MoS2
Journal article, 2023

Transition metal dichalcogenide (TMD) materials attract significant research attention thanks to their exceptional excitonic and optical properties. In this work, we analyze the formation of strained ultrasharp zigzag edges in MoS2 multilayers produced by anisotropic wet etching. The topography of the edges is determined by the relative stability of the different crystallographic directions of the multilayer as well as the interlayer interactions. Furthermore, we study the linear (Raman) and nonlinear (second-harmonic generation) spectroscopic characteristics of such edges and observe enhanced second-order nonlinearity originating from the strained zigzag edges. We also confirm that ultrasharp hexagonal nanoholes in MoS2 grow along the most stable crystallographic directions despite potential stacking faults or instabilities in the crystal quality. Our results open the way to exploit a broad range of phenomena occurring at the edges of MoS2 material, including the unique determination of crystal orientation for moiré engineering and strongly correlated phenomena in 2D material-based systems, as well as potential applications in TMD-based electrocatalysis and gas sensing.

Author

Adrián Dewambrechies

Student at Chalmers

Andrey Polyakov

SMENA Catalysis AB

IT-system

Betül Kücüköz

2D-Tech

Chalmers, Physics, Nano and Biophysics

Timur Shegai

Chalmers, Physics, Nano and Biophysics

2D-Tech

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 127 31 15395-15405

2D material-based technology for industrial applications (2D-TECH)

GKN Aerospace Sweden (2D-tech), 2021-01-01 -- 2024-12-31.

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Swedish Research Council (VR) (2016-06059), 2017-01-01 -- 2022-12-31.

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Subject Categories

Applied Mechanics

Other Physics Topics

Condensed Matter Physics

DOI

10.1021/acs.jpcc.3c03812

More information

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7/5/2024 7