Fingerprints of the Strong Interaction between Monolayer MoS2 and Gold
| Autor: | Velicky, Matej, Rodriguez, Alvaro, Bousa, Milan, Krayev, Andrey V., Vondracek, Martin, Honolka, Jan, Ahmadi, Mahdi, Donnelly, Gavin E., Huang, Fumin, Abruna, Hector D., Novoselov, Kostya S., Frank, Otakar |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | J Phys Chem Lett 11 (2020) 6112-6118 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/acs.jpclett.0c01287 |
| Popis: | Gold-mediated exfoliation of MoS2 has attracted considerable interest in the recent years. A 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 specific vibrational and binding energy fingerprints of such strong interaction using Raman and X-ray photoelectron spectroscopy, which indicate substantial strain and charge-transfer in monolayer MoS2. Near-field tip-enhanced Raman spectroscopy reveals heterogeneity of the MoS2-Au interaction at the nanoscale, reflecting the spatial non-conformity between the two materials. Far-field 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 strong MoS2-Au interaction and provide guidance for strain and charge doping engineering of MoS2. Comment: Main text: 23 pages, 4 figures. Supporting Information: 4 pages, 3 figures |
| Databáze: | arXiv |
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