Research On Typical Mechanical Behavior Of Monolayer Molybdenum Disulfide（SLMoS₂） Kirigami Structure

Due to its excellent mechanical,thermal,magnetic and electrical properties,two-dimensional materials represented by single-layer molybdenum disulfide are known as the materials that trigger revolutionary breakthroughs in micro-nano electronic systems in the new century.They are used in flexible electronics,aerospace,and software.Robotics,biomedicine and other fields have broad application prospects.In recent years,traditional kirigami technology has been introduced into the micro-nano field,providing a new solution for broadening the application fields of two-dimensional materials.At present,the mechanical properties of the single-layer molybdenum disulfide kirigami structure under typical loads such as tension,compression,and peeling are still unclear,which greatly affects its application in flexible electronics and other fields.This paper uses a combination of theoretical analysis and molecular dynamics simulation to explore the mechanical properties of a single-layer molybdenum disulfide kirigami structure under compression,tension,and peeling loads.The research mainly includes the following contents:(1)The instability mechanical behavior of a single-layer molybdenum disulfide kirigami structure under uniaxial and biaxial compression is studied.The study found that the kirigami structure shows different instability forms under compressive load,and the buckling characteristics strongly depend on factors such as scale,kirigami structure,and rotation angle.(2)A study on the strength and fracture properties of molybdenum disulfide containing dotted defects under uniaxial tensile load has been carried out.It is found that the simulation of molybdenum disulfide crack propagation is in accordance with the theoretical prediction,and the number,size,and angle of the arranged defects have an important influence on the strength and fracture properties of a single layer of molybdenum disulfide.For the single-layer molybdenum disulfide kirigami structure,the influence of the arrangement defects can be ignored.(3)The peeling properties of a single-layer molybdenum disulfide kirigami structure on a silicon substrate were explored.The study found that the peeling force reached equilibrium after shaking,and bounced off in the final peeling stage.By adjusting the kirigami structure,the average peeling force,failure type and peeling path dependence can be effectively changed.