The Intricate Love Affairs between MoS2 and Metallic Substrates

0533087 - ÚFCH JH 2021 RIV DE eng J - Journal Article
Velický, M. - Donnelly, G. E. - Hendren, W. R. - DeBenedetti, W. J. I. - Hines, M. A. - Novoselov, K. S. - Abruna, H. D. - Huang, F. - Frank, Otakar
The Intricate Love Affairs between MoS2 and Metallic Substrates.
Advanced Materials Interfaces. Roč. 2020, OCT 2020 (2020), č. článku 2001324. ISSN 2196-7350. E-ISSN 2196-7350
R&D Projects: GA ČR(CZ) GA17-18702S
EU Projects: European Commission(XE) 746685
Institutional support: RVO:61388955
Keywords : mechanical exfoliation * metallic substrates * MoS2
OECD category: Physical chemistry
Impact factor: 6.147, year: 2020
Method of publishing: Open access

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 MoS2 and related crystals addresses this problem. However, it remains unclear whether this method can be extended to other metals. Herein, mechanical exfoliation of MoS2 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–MoS2 heterostructures measured by Raman spectroscopy also is a critical factor facilitating the exfoliation, while the relative differences in the metal–MoS2 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.

Permanent Link: http://hdl.handle.net/11104/0311576