Modulating the Electronic Properties of Au–MoS₂ Interfaces Using Functionalized Self-Assembled Monolayers

Abstract

Molybdenum disulfide (MoS 2 ) is a transition-metal dichalcogenide with many applications including in electronic devices and sensors. A critical issue in the development of these devices is the high resistance between the metal contact and the molybdenum disulfide layer. In this study, we employ Raman spectroscopy and X-ray photoelectron spectroscopy to investigate the modification of Au−MoS 2 contact properties using functionalized alkanethiolate self-assembled monolayers (SAMs). We demonstrate that both 2H and 1T MoS 2 strongly interact with the underlying Au substrate. The electronic properties of the interface are mediated by the dipole moment of the alkanethiolate SAM, which have a −CH 3 , −CO 2 C 6 F 5 , −OH, or −COOH terminal group. Finally, we demonstrate the site-selective deposition of 2H and 1T MoS 2 on micropatterned SAMs to form conducting−semiconducting patterned MoS 2 films.

Stable and High-Energy-Density Zn-Ion Rechargeable Batteries Based on a MoS2-Coated Zn Anode

“…Here, we synthesized vertically aligned MoS 2 layers under a high rate of MoS 2 growth conditions. − The thickness of the MoS 2 film was varied by changing the deposition time of the reduction process (Figure S1). As shown in Figure b, the vertically aligned layers of the MoS 2 film were uniformly deposited on the surface of the Zn foil. , The 150 s electrodeposition time was selected as an optimum time for uniform MoS 2 coating for this study (Figures S2 and S3). HRTEM analysis (Figure c and d) confirms the vertical structure of MoS 2 and uniform distribution of Mo and S elements with a 1:2 atomic composition of Mo:S (Table S1) with a film thickness of approximately 70 nm (Figure e).…”

Self-Assembly of MoS2 Monolayer Sheets by Desulfurization

“…Driven by this fact, various complex self-assembling structural morphologies of MoS 2 monolayer sheets by desulfurization appear. In previous studies, it was found that interesting self-assembling nanostructures can form because of the covalent binding of atropisomeric molecules onto the substrate, indicating the important role of the molecule–molecule and molecule–substrate interactions on self-assembling behaviors. ,,, Interestingly, the physical properties of MoS 2 monolayer sheets may be tuned by the substrates, for example, thermal conductivity and electronic properties. , Due to the different molecule–molecule and molecule–substrate interactions, different substrates may result in different self-assembling morphologies of 2D layered sheets. As is known, a single layer of MoS 2 is composed of S–Mo–S sandwiched structures, and each Mo atom is covalently bonded with six S atoms.…”

“…46,52,76,77 Interestingly, the physical properties of MoS 2 monolayer sheets may be tuned by the substrates, for example, thermal conductivity 78 and electronic properties. 79…”

Local Manipulation of the Energy Levels of 2D TMDCs on the Microscale Level via Microprinted Self‐Assembled Monolayers

“…[31][32][33][34][35] The tuning of the physico-chemical interactions that occur between the TMDC and substrate is a practical approach to design high-performance TMDC-based devices. [21,22,24,32,36] An interfacemediated doping can be achieved via chemical modification of the substrate supporting the TMDC. For this, self-assembled monolayers (SAMs), that is, densely packed organic surfactants with a thickness of a single molecular layer, prove to be a promising candidate.…”