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ACS Nano. 2018 Mar 27;12(3):2803-2808. doi: 10.1021/acsnano.8b00043. Epub 2018 Mar 14.

Ultrastrong Graphene-Copper Core-Shell Wires for High-Performance Electrical Cables.

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Applied Quantum Composites Research Center, Institute of Advanced Composite Materials , Korea Institute of Science and Technology , Jeollabuk-do 55324 , Republic of Korea.
Department of Chemistry , Seoul National University , Seoul 08826 , Republic of Korea.
Graphene Square Inc., Inter-university Semiconductor Research Center , Seoul National University , Seoul 08826 , Republic of Korea.
Department of Nanomaterials and Nano Science , Korea University of Science and Technology (UST) , Daejeon 34113 , Republic of Korea.
Department of Physics & Astronomy , Sejong University , Seoul 05006 , Republic of Korea.


Recent development in mobile electronic devices and electric vehicles requires electrical wires with reduced weight as well as enhanced stability. In addition, since electric energy is mostly generated from power plants located far from its consuming places, mechanically stronger and higher electric power transmission cables are strongly demanded. However, there has been no alternative materials that can practically replace copper materials. Here, we report a method to prepare ultrastrong graphene fibers (GFs)-Cu core-shell wires with significantly enhanced electrical and mechanical properties. The core GFs are synthesized by chemical vapor deposition, followed by electroplating of Cu shells, where the large surface area of GFs in contact with Cu maximizes the mechanical toughness of the core-shell wires. At the same time, the unique electrical and thermal characteristics of graphene allow a ∼10 times higher current density limit, providing more efficient and reliable delivery of electrical energies through the GFs-Cu wires. We believe that our results would be useful to overcome the current limit in electrical wires and cables for lightweight, energy-saving, and high-power applications.


ampacity (maximum current density); copper; electroplating; graphene fibers; tensile strength


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