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Nano Lett. 2017 Aug 9;17(8):4740-4745. doi: 10.1021/acs.nanolett.7b01431. Epub 2017 Jul 24.

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

Author information

1
Graduate School of Energy Environment Water and Sustainability, Korea Advanced Institute of Science and Technology , Daejeon, Republic of Korea , 34141.
2
BASF Electronics Materials R&D Center Asia , Suwon, Republic of Korea , 16419.
3
Department of Mechanical Engineering and KI for the NanoCentury, Korea Advanced Institute of Science and Technology , Daejeon, Republic of Korea , 34141.
4
IBS Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Sungkyunkwan University , Suwon, Republic of Korea , 16419.
5
Department of Energy Science, Sungkyunkwan University , Suwon, Republic of Korea , 16419.

Abstract

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.

KEYWORDS:

Cu; bending; crack; fatigue; graphene; nanolayered composite

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