Strain and Charge Doping Fingerprints of the Strong Interaction between Monolayer MoS2 and Gold

0531048 - ÚFCH JH 2021 RIV US eng J - Journal Article
Velický, M. - Rodriguez, Álvaro - Bouša, Milan - Krayev, A. V. - Vondráček, Martin - Honolka, Jan - Ahmadi, M. - Donnelly, G. E. - Huang, F. - Abruna, H. D. - Novoselov, K. S. - Frank, Otakar
Strain and Charge Doping Fingerprints of the Strong Interaction between Monolayer MoS2 and Gold.
Journal of Physical Chemistry Letters. Roč. 11, č. 15 (2020), s. 6112-6118. ISSN 1948-7185
R&D Projects: GA ČR(CZ) GA17-18702S; GA MŠMT EF16_013/0001406; GA MŠMT(CZ) EF16_013/0001821
EU Projects: European Commission(XE) 746685
Institutional support: RVO:61388955 ; RVO:68378271
Keywords : single-layer MoS2 * multilayer * spectroscopy
OECD category: Physical chemistry; Physical chemistry (FZU-D)
Impact factor: 6.475, year: 2020
Method of publishing: Open access

Gold-mediated exfoliation of MoS2 has recently attracted considerable interest. The strong interaction between MoS2 and Au facilitates preferential production of centimeter-sized monolayer MoS2 with near-unity yield and provides a heterostructure system noteworthy from a fundamental standpoint. However, little is known about the detailed nature of the MoS2–Au interaction and its evolution with the MoS2 thickness. Here, we identify the specific vibrational and binding energy fingerprints of this interaction using Raman and X-ray photoelectron spectroscopy, which indicate substantial strain and charge doping in monolayer MoS2. Tip-enhanced Raman spectroscopy reveals heterogeneity of the MoS2–Au interaction at the nanoscale, reflecting the spatial nonconformity between the two materials. Micro-Raman spectroscopy shows that this interaction is strongly affected by the roughness and cleanliness of the underlying Au. Our results elucidate the nature of the MoS2–Au interaction and guide strain and charge doping engineering of MoS2.
Permanent Link: http://hdl.handle.net/11104/0309800