Graphene-Coated Metal Wires for High-Power Transmission at High Temperatures
Most power transportation and electrical devices rely on metal wire such as copper (Cu) and aluminum (Al) for electrical power transmission. However, with technical advances in electric vehicles, unmanned drones, portable devices, and deployable military applications, there is a need to replace traditional metal conductors with materials having high current-carrying capabilities, high resistance to oxidation, and the ability to operate in harsh environments.
Researchers at Arizona State University have developed a method for synthesizing continuous graphene on the surface of Cu wire using chemical vapor deposition (CVD), resulting in an axially continuous metal-core and graphene-shell structure. This structure features low thermal coefficient of resistivity and improved heat loss through the surfaces, outperforming bare Cu by 63%. A 41% increase in electrical conductivity is also conferred by the graphene shell, improving the overall current-carrying capability to 5.5X that of bulk Cu. The axially continuous metal-core and graphene-shell structure can also be synthesized in a multi-shell microstructure with sequential deposition of shell to increase the current-carrying capability beyond 5.5X.
• Electric power systems
• Electronic and communication devices
• Transportation systems
Benefits and Advantages
• High current-carrying capacity – 5.5X greater than bulk Cu counterpart
• Improved electrical conductivity – Increase of 41% over bare Cu
• Improved heat loss – Increase of 63% over bare Cu
Related Publication: An Axially Continuous Graphene–Copper Wire for High-Power Transmission: Thermoelectrical Characterization and Mechanisms
Research Homepage of Professor Wonmo Kang