Nanoindentation on Monolayer MoS₂ Kirigami.

Area of Science:

• Materials Science
• Mechanical Engineering
• Nanotechnology

Background:

• The mechanical properties of materials can be significantly altered using kirigami patterns.
• Molybdenum disulfide (MoS2) is a promising 2D material with unique electronic and mechanical characteristics.

Purpose of the Study:

• To investigate the mechanical properties of kirigami-patterned MoS2 membranes.
• To understand how kirigami structures influence the ductility and elastic recovery of MoS2.

Main Methods:

• Atomically thin MoS2 membranes were patterned using kirigami.
• Molecular dynamics simulations were employed to perform nanoindentation tests.
• Rectangular and hexagonal kirigami structures were simulated.

Main Results:

• Kirigami MoS2 membranes exhibited dramatically enhanced ductility compared to pristine MoS2.
• Load-displacement curves showed negligible hysteresis.
• Kirigami structures demonstrated remarkable elastic recovery upon unloading.

Conclusions:

• Kirigami patterning is an effective method for tuning the mechanical behavior of 2D materials like MoS2.
• Defects at the edges and corners of kirigami structures are crucial for their mechanical response.
• This study opens avenues for designing advanced materials with tailored mechanical properties.