Mechanical response of bilayer graphene under different loading modes

Resumo

Carbon-based materials remain promising nanostructures for the development of efficient and
innovative nanotechnologies due to their outstanding properties. Among these nanostructures, bilayer nanoporous
graphene has been considered a good candidate for applications involving water desalination, energy storage,
among others. However, the remarkable mechanical properties of the pristine graphene sheets are strongly affected
by the presence of nanoporous. Thus, in this study, molecular dynamics (MD) were conducted to investigate
bilayer nanoporous graphene's mechanical response under several loading and constraints. Our results reveal that
the introduction of porosity in the graphene's layers decrease significantly their fracture strain. The idea of adding
a second, constrained layer or constrained patches of different sizes, to improve the mechanical tensile properties
of the upper layer yielded no significant modification of its mechanical properties. This behavior suggests that to
influence the mechanical properties of a defect or porous graphene layer by adding parallel layers or repair patches,
other kinds of bonds, not van der Waals, must be created among the layers.