Role of Graphene in Reducing Fatigue Damage in Cu/Gr Nanolayered Composite

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Nanoscale metal/graphene nanolayered composite is known to have ultrahigh strength as the graphene effectively blocks dislocations from penetrating through the metal/graphene interface. The same graphene interface, which has a strong sp2 bonding, can simultaneously serve as an effective interface for deflecting the fatigue cracks that are generated under cyclic bendings. In this study, Cu/Gr composite with repeat layer spacing of 100 nm was tested for bending fatigue at 1.6% and 3.1% strain up to 1,000,000 cycles that showed for the first time a 5-6 times enhancement in fatigue resistance compared to the conventional Cu thin film. Fatigue cracks that are generated within the Cu layer were stopped by the graphene interface, which are evidenced by cross-sectional scanning electron microscopy and transmission electron microscopy images. Molecular dynamics simulations for uniaxial tension of Cu/Gr showed limited accumulation of dislocations at the film/substrate interface, which makes the fatigue crack formation and propagation through thickness of the film difficult in this materials system.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-08
Language
English
Article Type
Article
Keywords

INTEGRATED-CIRCUITS; LENGTH-SCALE; ELECTRONICS; COPPER; FILMS; CU; MULTILAYERS; MECHANISMS; STRENGTH; BEHAVIOR

Citation

NANO LETTERS, v.17, no.8, pp.4740 - 4745

ISSN
1530-6984
DOI
10.1021/acs.nanolett.7b01431
URI
http://hdl.handle.net/10203/226137
Appears in Collection
ME-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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