Abstract
Nanomaterials Although two-dimensional materials such as molybdenum disulfide (MoS2) can exhibit high strength, their usefulness is limited by ready propagation of cracks through the lattice that limits their fracture toughness. To create nanometer-scale holes, Manzaneres-Negro et al. irradiated suspended monolayers of MoS2 with argon ions to introduce single-atom lattice vacancies and gallium ions. Mechanical testing showed that a defect density of 0.2% reduced the breaking strength by as much as 50% and decreased the crack propagation length by a factor of 5. Increasing the defect density such that the mean distance between defects decreased by about 50% increased a measure of fracture toughness by about 40%. ACS Nano. 10.1021/acsnano.0c08235 (2021).
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