Definitive engineering strength and fracture toughness of graphene through on-chip nanomechanics
(2024) Nature Communications — Vol. 15, n° 1, p. 5863 (2024)
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- Authors
Jaddi, Sahar 
Pugno, Nicola M.
- Abstract
- Fail-safe design of devices requires robust integrity assessment procedures which are still absent for 2Dmaterials, hence affecting transfer to applications. Here, a combined on-chip tension and cracking method, and associated data reduction scheme have been developed to determine the fracture toughness and strength of monolayer-monodomain-freestanding graphene. Myriads of specimens are generated providing statistical data. The crack arrest tests provide a definitive fracture toughness of 4.4 MPa√m. Tension on-chip provides Young’s modulus of 950 GPa, fracture strain of 11%, and tensile strength up to 110 GPa, reaching a record of stored elastic energy ~6 GJm−3 as confirmed by thermodynamics and quantized fracture mechanics. A ~ 1.4nm crack size is often found responsible for graphene failure, connected to 5-7 pair defects. Micron-sized graphene membranes and smaller can be produced defect-free, and design rules can be based on 110 GPa strength. For larger areas, a fail-safe design should be based on a maximum 57 GPa strength.
- Affiliations
Hunan University School of Physics and Electronics University of Trento Laboratory for Bioinspired, Bionic, Nano, Meta Materials & Mechanics QueenMary University of London 5School of Engineering and Material Science WEL Research Institute
Citations
Jaddi, S., Malik, M. W., Wang, B., Pugno, N. M., Zeng, Y., Coulombier, M., Raskin, J.-P., & Pardoen, T. (2024). Definitive engineering strength and fracture toughness of graphene through on-chip nanomechanics. Nature Communications, 15(1), 5863. https://doi.org/10.1038/s41467-024-49426-3 (Original work published 2024)