Molecular dynamics study on the mechanical properties of multilayer MoS₂ under different potentials

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Molybdenum disulfide (MoS2) exhibits unique mechanical and electrical properties.
• Its potential for flexible electronic devices necessitates understanding its behavior under stress.

Purpose of the Study:

• To investigate the mechanical properties of multilayer MoS2 under compression and stretching.
• To identify the most suitable intra-layer and inter-layer potentials for molecular dynamics simulations of MoS2.

Main Methods:

• Utilized the molecular dynamics method to simulate MoS2 under varying potentials.
• Analyzed deformation mechanisms, including fracture types (plastic vs. brittle) and force contributions.

Main Results:

• Inter-layer repulsive forces during compression are primarily due to sulfur atoms.
• Intra-layer potentials dictate tensile fracture modes: plastic (structural holes/distortions) or brittle (instantaneous destruction).
• Inter-layer potentials significantly impact MoS2 structure during compression but have less effect during stretching.

Conclusions:

• Selected the most suitable intra-layer and inter-layer potentials for multilayer MoS2 simulations.
• These validated potentials provide a reliable reference for future MoS2 research and device development.