Definitive engineering strength and fracture toughness of graphene through on-chip nanomechanics

Fail-safe design of devices requires robust integrity assessment procedures which are still absent for 2D materials, 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 toug...

Full description

Saved in:
Bibliographic Details
Published in:Nature communications 2024-07, Vol.15 (1), p.5863-11, Article 5863
Main Authors: Jaddi, Sahar, Malik, M. Wasil, Wang, Bin, Pugno, Nicola M., Zeng, Yun, Coulombier, Michael, Raskin, Jean-Pierre, Pardoen, Thomas
Format: Article
Language:English
Subjects:
140/133
142/126
147/135
639/301/357/1018
639/925/930/12
Crack arrest
Data reduction
Defects
Design
Fracture mechanics
Fracture toughness
Graphene
Humanities and Social Sciences
Mechanical properties
Modulus of elasticity
multidisciplinary
Science
Science (multidisciplinary)
Statistical analysis
Strain
Tensile strength
Two dimensional materials
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Fail-safe design of devices requires robust integrity assessment procedures which are still absent for 2D materials, 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 GJ m −3 as confirmed by thermodynamics and quantized fracture mechanics. A ~ 1.4 nm 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. Researchers used a fracture mechanics approach with on-chip nanomechanical testing and a large number of samples to establish a definitive fracture toughness of graphene of 4.4 MPa m 1/2 , with fracture controlled by unavoidable 1.4 nm-size defects.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-49426-3