Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 9, Pages 8197-8204Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19012
Keywords
carbon nanotube; composite fiber; buffer layer; interfacial bonding electroplating; ampacity
Funding
- National Natural Science Foundation of China [21503267, 21473238, 51561145008]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2015256]
- National Key Research and Development Program of China [2016YFA0203301]
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Carbon nanotube (CNT) fiber has not shown its advantage as next generation light-weight conductor due to the large contact resistance between CNTs, as reflected by its low conductivity and ampacity. Coating CNT fiber with a metal layer like Cu has become an effective solution to this problem. However, the weak CNT Cu interfacial bonding significantly limits the mechanical and electrical performances. Here, we report that a strong CNT Cu interface can be formed by introducing a Ni nanobuffer layer before depositing the Cu layer. The Ni nanobuffer layer remarkably promotes the load and heat transfer efficiencies between the CNT fiber and Cu layer and improves the quality of the deposited Cu layer. As a result, the new composite fiber with a 2 mu m thick Cu layer can exhibit a superhigh effective strength >800 MPa, electrical conductivity >2 X 10(7) S/m, and ampacity >1 x 10(5) A/cm(2). The composite fiber can also sustain 10 000 times of bending and continuously work for 100 h at 90% ampacity.
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