Fatigue Response of MoS<sub>2</sub> with Controlled Introduction of Atomic Vacancies.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37970788.
- Also identified by DOI 10.1021/acs.nanolett.3c02479 and PMC identifier 10722543.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Fatigue-induced failure resulting from repetitive stress-strain cycles is a critical concern in the development of robust and durable nanoelectromechanical devices founded on 2D semiconductors. Defects, such as vacancies and grain boundaries, inherent in scalable materials can act as stress concentrators and accelerate fatigue fracture. Here, we investigate MoS<sub>2</sub> with controlled atomic vacancies, to elucidate its mechanical reliability and fatigue response as a function of atomic defect density. High-quality MoS<sub>2</sub> demonstrates an exceptional fatigue response, enduring 10<sup>9</sup> cycles at 80% of its breaking strength (13.5 GPa), surpassing the fatigue resistance of steel and approaching that of graphene. The introduction of atomic defect densities akin to those generated during scalable synthesis processes (∼10<sup>12</sup> cm<sup>-2</sup>) reduces the fatigue strength to half the breaking strength. Our findings also point toward a sudden defect reconfiguration prior to global failure as the primary fatigue mechanism, offering valuable insights into structure-property relationships.