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Strain-Induced Decoupling Drives Gold-Assisted Exfoliation of Large-Area Monolayer 2D Crystals
- 1.0619191 - ÚFCH JH 2026 RIV US eng J - Článek v odborném periodiku
Ziewer, J. - Ghosh, A. - Hanušová, Michaela - Pirker, Luka - Frank, Otakar - Velický, Matěj - Gruning, M. - Huang, F.
Strain-Induced Decoupling Drives Gold-Assisted Exfoliation of Large-Area Monolayer 2D Crystals.
Advanced Materials. Roč. 37, č. 14 (2025), č. článku 2419184. ISSN 0935-9648. E-ISSN 1521-4095
Grant CEP: GA ČR(CZ) GA22-04408S; GA MŠMT EH22_008/0004558
Institucionální podpora: RVO:61388955
Klíčová slova: mos2 * 2D materials * decoupling * gold-assisted exfoliation * MoS2 * Raman spectroscopy * strain
Obor OECD: Physical chemistry
Impakt faktor: 27.4, rok: 2023 ; AIS: 6.787, rok: 2023
Způsob publikování: Open access
DOI: https://doi.org/10.1002/adma.202419184
Gold-assisted exfoliation (GAE) is a groundbreaking mechanical exfoliation technique that produces centimeter-scale single-crystal monolayers of 2D materials. Such large, high-quality films offer unparalleled advantages over the micron-sized flakes typically produced by conventional exfoliation techniques, significantly accelerating the research and technological advancements in the field of 2D materials. Despite its wide applications, the fundamental mechanism of GAE remains poorly understood. In this study, using MoS2 on Au as a model system, ultra-low frequency Raman spectroscopy is employed to elucidate how the interlayer interactions within MoS2 crystals are impacted by the gold substrate. The results reveal that the coupling at the first MoS2-MoS2 interface between the adhered layer on the gold substrate and the adjacent layer is substantially weakened, with the binding force being reduced to nearly zero. This renders the first interface the weakest point in the system, thereby the crystal preferentially cleaves at this junction, generating large-area monolayers with sizes comparable to the parent crystal. Biaxial strain in the adhered layer, induced by the gold substrate, is identified as the driving factor for the decoupling effect. The strain-induced decoupling effect is established as the primary mechanism of GAE, which can also play a significant role in general mechanical exfoliations.
Trvalý link: https://hdl.handle.net/11104/0365926Název souboru Staženo Velikost Komentář Verze Přístup 0619191.pdf 0 2.9 MB open access Vydavatelský postprint povolen
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