Journal article
Engineered Creation of Periodic Giant, Nonuniform Strains in MoS2 Monolayers
Advanced materials interfaces, Vol.7(17), 2000621
10/09/2020
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Abstract
The realization of ordered strain fields in 2D crystals is an intriguing perspective in many respects, including the instauration of novel transport regimes and enhanced device performances. However, the current straining techniques hardly allow to reach strains higher than approximate to 3% and in most cases there is no control over the strain distribution. In this work, a method is demonstrated to subject micrometric regions of atomically thin molybdenum disulfide (MoS2) to giant strains with the desired ordering. Selective hydrogen-irradiation of bulk flakes allows the creation of arrays of size/position-controlled monolayer domes containing pressurized hydrogen. However, the gas pressure is ruled by energy minimization, limiting the extent and geometry of the mechanical deformation of the 2D membrane. Here, a protocol is developed to create a mechanical constraint, that alters remarkably the morphology of the domes, otherwise subject to universal scaling laws, as demonstrated by atomic force microscopy. 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 toward the strain engineering of 2D crystals.
Details
- Title
- Engineered Creation of Periodic Giant, Nonuniform Strains in MoS2 Monolayers
- Creators
- Elena Blundo - Sapienza University of RomeCinzia Di Giorgio - University of SalernoGiorgio Pettinari - Institute for Photonics and Nanotechnologies, National Research Council (Rome, Italy)Tanju Yildirim - National Institute for Materials ScienceMarco Felici - Sapienza University of RomeYuerui Lu - Australian National UniversityFabrizio Bobba - University of SalernoAntonio Polimeni - Sapienza University of Rome
- Publication Details
- Advanced materials interfaces, Vol.7(17), 2000621
- Publisher
- Wiley
- Number of pages
- 8
- Grant note
- Sapienza Università di Roma Italian Ministry for Education University and Research within the Futuro in Ricerca. Grant Number: RBFR12RS1W Regione Lazio programme. Grant Numbers: 13/2008, 85-2017-15200 Australian Research Council. Grant Numbers: DE140100805, DP180103238 ARC Centre of Excellence in Future Low-Energy Electronics Technologies. Grant Number: CE170100039
- Identifiers
- 991013160125602368
- Copyright
- © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article