期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 15, 页码 6112-6118出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c01287
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资金
- European Union [746685]
- EPSRC [EP/N025938/1]
- Czech Science Foundation [GACR 17-18702S]
- NSF [NNCI1542081]
- NSF MRSEC program [DMR-1719875]
- Ministry of Education, Youth and Sports of the Czech Republic (MEYS)
- European Union. European Structural and Investments Funds [CZ.02.1.01/0.0/0.0/16_013/0001821]
- MEYS of the Czech Republic [CZ.02.1.01/0.0/0.0/16_013/0001406]
- EPSRC [EP/N025938/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [746685] Funding Source: Marie Curie Actions (MSCA)
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.
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