Centimeter-Scale Periodically Corrugated Few-Layer 2D MoS₂ with Tensile Stretch-Driven Tunable Multifunctionalities

Abstract

Two-dimensional (2D) transition metal dichalcogenide (TMD) layers exhibit superior optical, electrical, and structural properties unattainable in any traditional materials. Many of these properties are known to be controllable via external mechanical inputs, benefiting from their extremely small thickness coupled with large in-plane strain limits. However, realization of such mechanically driven tunability often demands highly complicated engineering of 2D TMD layer structures, which is difficult to achieve on a large wafer scale in a controlled manner. Herein, we explore centimeter-scale periodically corrugated 2D TMDs, particularly 2D molybdenum disulfide (MoS), and report their mechanically tunable multifunctionalities. We developed a water-assisted process to homogeneously integrate few layers of 2D MoS on three-dimensionally corrugated elastomeric substrates on a large area (>2 cm). The evolution of electrical, optical, and structural properties in these three-dimensionally corrugated 2D MoS layers was systematically studied under controlled tensile stretch. We identified that they present excellent electrical conductivity and photoresponsiveness as well as systematically tunable surface wettability and optical absorbance even under significant mechanical deformation. These novel three-dimensionally structured 2D materials are believed to offer exciting opportunities for large-scale, mechanically deformable devices of various form factors and unprecedented multifunctionalities.

Automated Assembly of Wafer-Scale 2D TMD Heterostructures of Arbitrary Layer Orientation and Stacking Sequence Using Water Dissoluble Salt Substrates

“…Figure c illustrates schematics of our manufacturing strategy, which overcomes this limitation and can be generalized to 2D TMD layers of any layer orientation. Metal thin films are deposited on single-crystalline salt substrates, and the prepared samples undergo CVD processes adopting the previously developed recipes. ,,− The 2D layer orientation can be controlled by adjusting the thickness of the metal films, , and we focus on growing and delaminating VA-2D layers. As-prepared samples are immersed in water, which causes the spontaneous delamination of only VA-2D layers only within a few seconds after the immersion.…”

MoS2 with Stable Photoluminescence Enhancement under Stretching via Plasmonic Surface Lattice Resonance

“…After dicing, we covered a piece of MoS 2 grown on sapphire (0.5 × 0.5 cm) on the exposed silver NDs (Status F). Owing to the viscosity of PDMS and the difference in hydrophilicity between MoS 2 and sapphire, we could remove the sapphire substrate by the liquid wedging method [ 35 ] and uniformly attached the above diced MoS 2 monolayer on the silver ND array (Status G). Eventually, we realized our proposed structure by sealing the MoS 2 and silver ND array using PDMS.…”

Smart illuminative Charging (SiC) of Future Electric Vehicles Using Roadway Infrastructure

“…In this paper, the high-quality, large-area (up to 2 cm x 2 cm) EH2N was prepared and characterized for the novel purpose of using them as a scalable, mechanically robust energy harvesting source that can be integrated in the existing roadway infrastructure. Figure 2 shows the 2D nanomaterials prepared by the CVD technique (in collaboration with researchers at University of Central Florida [9]). The two "2 cm x 2 cm" square samples in the figure represent the energyharvestable 2D nanomaterials (EH2N) successfully synthesized and deposited on the SiO2/Si substrate in the quartz tube CVD furnace at a relatively large scale using the method described in the literature [9].…”

“…Figure 2 shows the 2D nanomaterials prepared by the CVD technique (in collaboration with researchers at University of Central Florida [9]). The two "2 cm x 2 cm" square samples in the figure represent the energyharvestable 2D nanomaterials (EH2N) successfully synthesized and deposited on the SiO2/Si substrate in the quartz tube CVD furnace at a relatively large scale using the method described in the literature [9]. The thicknesses of EH2N range from 1.5 nm to 2 nm as confirmed in the cross-sectional transmission electron micrograph (TEM) image shown in the inset.…”