Investigation of the mechanical properties of multilayer graphene helicoids with different geometric characteristics using molecular dynamics simulation

Graphene helicoid is a man-made spiral structure that has recently been created with the advent of nanotechnology inspired by nature. In this study, the mechanical properties of multi-layer graphene helicoid with different geometric characteristics are studied using molecular dynamics simulation and the relationship between number of layers, geometric properties and mechanical properties of nanoparticles are investigated. The results show that the unique geometric properties of these nanoparticles produce interesting mechanical properties that are highly dependent on their structure. The stages of the tensile behavior of these nanoparticles are altered by increasing the number of layers corresponding to the geometric characteristics of the nanoparticles. One of the most important characteristics of these nanoparticles is their high stretchability, even for some specimens, up to 3000%, which, with the addition of a layer to their structure, decreases sharply. The results also indicate a strong increase in force in the small strain range with the onset of the stretching process due to the strong van der Walls forces between the adjacent layers. The spring constant for these nanoparticles is calculated in this initial area of the tensile test and, decreases with the addition of the layers. Identifying the properties of multilayered graphene helicoid can lead to an increase in their efficiency and their optimal performance in nanoscale devices and even improve multiscale performance.