Low‐Density Multilayer Graphdiyne Film with Excellent Energy Dissipation Capability under Micro‐Ballistic Impact

Abstract

Dynamical performance of multilayer graphdiyne (MLGDY) with ultra‐low density and flexible features is investigated using laser‐induced micro‐projectile impact testing (LIPIT) and molecular dynamics (MD) simulations. The results reveal that the MLGDY exhibits excellent dynamic energy dissipation ability mainly due to the excellent in‐plane wave velocity resulting from the diacetylene linkages between benzene rings. In addition, the unique multiple crack tips and their propagation further promote the energy dissipation capability. The energy dissipation capability of the MLGDY is found to reduce with increasing thickness due to compression‐shear induced failure of several upper layers of relatively thick MLGDY, which hinders delocalized energy dissipation ability. Moreover, the impact resistance force of the MLGDY increases almost linearly with increasing impact velocity, demonstrating the applicability of the traditional compressive resistance theory of laminates for MLGDY. Based on the experimental observation and the simulation results, two feasible strategies, i.e., combining with high‐strength multi‐layer graphene and rotated graphdiyne (GDY) interlayer to avoid stacking of sp‐hybridized carbon atoms, are proposed to further improve the impact resistance of the MLGDY. The study provides direct proof of excellent impact resistance of the versatile MLGDY and proposes feasible fabrication strategies to further improve the anti‐ballistic performance in future.

High Impact Resistance of 2D MXene with Multiple Fracture Modes

“… Theoretically, the molecular dynamics (MD) simulation, density functional theory (DFT), and continuum theory were also employed to investigate the tensile mechanical behaviors of MXene (Ti 3 C 2 T x ), where the defect tolerance and anisotropic fracture behaviors were revealed. − It has to be pointed out that current works are mainly focused on the in-plane mechanical properties of MXene, and the works relating to out-of-plane impacting mechanical properties of MXene cannot be referenced, to our best knowledge. So far, a number of impact experiments have been focused on studying the impact resistance of conventional macroscopic materials such as aluminum or steel. , Besides, advanced laser-induced microprojectile impact testing (LIPIT) has been developed to experimentally reveal the out-of-plane impacting properties of microscale materials, such as multilayer graphene, graphdiyne, and carbon nanotube films. − Nevertheless, for nanoscale materials, such as 2D nanomaterials, it is very difficult to experimentally quantify the impact resistance …”