Engineering the Crack Structure and Fracture Behavior in Monolayer MoS₂ By Selective Creation of Point Defects.

ABSTRACT: Monolayer transition-metal dichalcogenides, e.g., MoS₂ , typically have high intrinsic strength and Young's modulus, but low fracture toughness. Under high stress, brittle fracture occurs followed by cleavage along a preferential lattice direction, leading to catastrophic failure. Defects have been reported to modulate the fracture behavior, but pertinent atomic mechanism still remains elusive. Here, sulfur (S) and MoS_n point defects are selectively created in monolayer MoS₂ using helium- and gallium-ion-beam lithography, both of which reduce the stiffness of the monolayer, but enhance its fracture toughness. By monitoring the atomic structure of the cracks before and after the loading fracture, distinct atomic structures of the cracks and fracture behavior

SUBMITTER: Wang G 

PROVIDER: S-EPMC9353506 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature