Surface Sensitive Raman Response of Metal-Supported Monolayer MoS$_2$
Abstract
The Raman spectrum of monolayer (ML) MoS is remarkably affected by the interaction with metals. In this work we studied ML-MoS supported by the Ag(111) and Ag(110) surfaces by using a combined experimental and theoretical approach. The MoS layer was directly grown on atomically clean Ag(111) and Ag(110) surfaces by pulsed laser deposition, followed by in-situ thermal annealing under ultra-high vacuum conditions. The morphology and structure of the two systems were characterized in-situ by scanning tunneling microscopy, providing atomic-scale information on the relation between the MoS lattice and the underlying surface. Raman spectroscopy revealed differences between the two MoS-metal interfaces, especially concerning the behavior of the out-of-plane vibrational mode, which splits into two contributions on Ag(110). The metal-induced effects on MoS vibrational modes are further evidenced by transferring MoS onto a more inert substrate (SiO/Si), where the MoS Raman response displays a more ``freestanding-like'' behavior. The experimental data were interpreted with the support of ab-initio calculations of the vibrational modes, which provided insight into the effect of interface properties, such as strain and out-of-plane distortion. Our results highlight the influence of the interaction with metals on MoS vibrational properties, and show the high sensitivity of MoS Raman modes to the surface structure of the supporting metal.
Cite
@article{arxiv.2504.00208,
title = {Surface Sensitive Raman Response of Metal-Supported Monolayer MoS$_2$},
author = {Francesco Tumino and Sergio Tosoni and Paolo D'Agosta and Valeria Russo and Carlo Enrico Bottani and Andrea Li Bassi and Carlo Spartaco Casari},
journal= {arXiv preprint arXiv:2504.00208},
year = {2025}
}
Comments
This document is the unedited Author's version of a Submitted Work that was subsequently accepted for publication in The Journal of Physical Chemistry C, copyright \c{opyright} 2025 American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.4c06548