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Description:

The realization of ordered strain fields in two-dimensional crystals is an intriguing
perspective in many respects, including the instauration of novel transport regimes and the
achievement of enhanced device performances. However, the current straining techniques
hardly allow to reach strain values higher than 2-3 % and in most cases there’s no control
over the strain distribution. In this work, we demonstrate a method to subject micrometric
regions of atomically-thin molybdenum disulphide (MoS2) to giant strains with the desired
ordering. Selective proton-irradiation of bulk flakes had been proposed to create arrays of
size/position controlled monolayer domes containing pressurized hydrogen. However, therein
the gas pressure is ruled by energy minimization, which limits the extent and geometry of the
mechanical deformation of the 2D membrane. Here, we develop a protocol to create a
mechanical constraint, and atomic force microscopy measurements reveal that this constraint
alters remarkably the morphology of the domes, otherwise subject to universal scaling laws.
This enables the realization of unprecedented periodic configurations of large strain gradients
-estimated by numerical simulations- with the highest strains being close to the rupture
critical values (> 10 %). The creation of such high strains is confirmed by Raman
experiments. The method proposed here represents an important step towards the strain
engineering of two-dimensional crystals.

Rights:

• In Copyright
  

Keyword: Transition Metal Dichalcogenide, Strain Engineering

Date published: 2020-06-25

Publisher: Wiley

Journal:

• Advanced Materials Interfaces (ISSN: 21967350) vol. 7 issue. 17 2000621

Funding:

• Sapienza Università di Roma
• Australian Research Council DE140100805
• Australian Research Council DP180103238

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/admi.202000621

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Updated at: 2025-06-09 15:05:15 +0900

Published on MDR: 2025-06-09 16:21:31 +0900