Fingerprints of the Strong Interaction between Monolayer MoS2 and Gold

Abstract

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.

Main text: 23 pages, 4 figures. Supporting Information: 4 pages, 3 figures

References in corpus (6)

• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• Symmetry-dependent phonon renormalization in monolayer MoS2 transistor
• Band Gap Engineering with Ultralarge Biaxial Strains in Suspended Monolayer MoS2
• Newly observed first-order resonant Raman modes in few-layer MoS${}_2$
• Imaging Nanoscale Inhomogeneities and Edge Delamination in As-Grown MoS2 Using Tip-Enhanced Photoluminescence

Cited by in corpus (18)

• Strain, doping and electronic transport of large area monolayer MoS2 exfoliated on gold and transferred to an insulating substrate
• WS2 Monolayers Coupled to Hyperbolic Metamaterial Nanoantennas: Broad Implications for Light-Matter-Interaction Applications
• Substrate impact on the thickness dependence of vibrational and optical properties of large area $Mo{S}_2$ produced by gold-assisted exfoliation
• Tip-induced excitonic luminescence nanoscopy of an atomically-resolved van der Waals heterostructure
• Macroscopic Single-Phase Monolayer Borophene on Arbitrary Substrates
• Exfoliation of 2D van der Waals crystals in ultrahigh vacuum for interface engineering
• Adhesion of 2D MoS${}_2$ to Graphite and Metal Substrates Measured by a Blister Test
• Direct atomic layer deposition of ultra-thin $A{l}_2{O}_3$ and $Hf{O}_2$ films on gold-supported monolayer $Mo{S}_2$
• Spatiotemporal Imaging of Thickness-Induced Band Bending Junctions
• Twist angle dependent electronic properties of exfoliated single layer MoS${}_2$ on Au(111)
• Probing the Local Dielectric Function by Near Field Optical Microscopy Operating in the Visible Spectral Range
• Influence of Rhenium Concentration on Charge Doping and Defect Formation in MoS2
• Reliable and Broad-range Layer Identification of Au-assisted Exfoliated Large Area MoS${}_2$ and WS${}_2$ Using Reflection Spectroscopic Fingerprints
• Isolating the Nonlinear Optical Response of a MoS${}_2$ Monolayer under Extreme Screening of a Metal Substrate
• Surface Sensitive Raman Response of Metal-Supported Monolayer MoS${}_2$
• Localized Gradual Photomediated Brightness and Lifetime Increase of Superacid Treated Monolayer MoS${}_2$
• Raman Digital Twin of Monolayer Janus Transition Metal Dichalcogenides
• Mechanical Detuning of Exciton-Phonon Resonance in WS2