Journal
ADVANCED MATERIALS INTERFACES
Volume 7, Issue 23, Pages -Publisher
WILEY
DOI: 10.1002/admi.202001324
Keywords
mechanical exfoliation; metallic substrates; MoS2; strains; surface oxidation
Funding
- European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie grant [746685]
- EPSRC [EP/N025938/1]
- Seagate Technology (Ireland) under SOW [00077300.0]
- NSF [NNCI-1542081]
- NSF MRSEC program [DMR-1719875]
- Czech Science Foundation [GACR 17-18702S]
- EPSRC [EP/N025938/1, EP/P026850/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [746685] Funding Source: Marie Curie Actions (MSCA)
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Mechanical exfoliation yields high-quality 2D materials but is challenging to scale up due to the small lateral size and low yield of the exfoliated crystals. Gold-mediated exfoliation of macroscale monolayer MoS(2)and related crystals addresses this problem. However, it remains unclear whether this method can be extended to other metals. Herein, mechanical exfoliation of MoS(2)on a range of metallic substrates is studied. It is found that Au outperforms all the other metals in their ability to exfoliate macroscale monolayer MoS2. This is rationalized by gold's ability to resist oxidation, which is compromised on other metals and leads to a weakened binding with MoS2. An anomalously high monolayer yield found for Ag suggests that the large interfacial strain in the metal-MoS(2)heterostructures measured by Raman spectroscopy also is a critical factor facilitating the exfoliation, while the relative differences in the metal-MoS(2)binding play only a minor role. These results provide a new incentive for investigations of 2D material-substrate combinations applicable where high-quality 2D crystals of macroscopic dimensions are of importance.
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