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Copper (Cu) is the electrical conductor of choice in many categories ofelectrical wiring, with household and building installations being the majormarket of this metal. This work demonstrates the coating of Cu wires - withdiameters relevant for low voltage (LV) applications - with graphene. Thechemical vapor deposition (CVD) coating process is rapid, safe, scalable andindustrially compatible. Graphene-coated Cu wires display oxidation resistanceand increased electrical conductivity (up to 1% immediately after coating andup to 3% after 24 months), allowing for wire diameter reduction and thussignificant savings in wire production costs. Combined spectroscopic anddiffraction analysis indicate that the conductivity increase is due to a changein Cu crystallinity, induced by the coating process conditions, whileelectrical testing of aged wires shows that graphene plays a major role inmaintaining improved electrical performances over long periods of time.Finally, graphene coating of Cu wires using an ambient pressure roll-to-roll(R2R) CVD reactor is demonstrated. This enables the in-line production ofgraphene-coated metallic wires as required for industrial scale-up.

Industrial graphene coating of low-voltage copper wires for power distribution