Graphene fibers are graded by the orderly arrangement of graphene into a new type of carbon fiber, with excellent electrical / heat transfer characteristics.
Around the graphene fiber high performance and multi-functional and other key issues, Zhejiang University Department of Polymer Science and Engineering Professor Gao made a series of breakthrough research group, has achieved high-strength high-modulus graphene fibers, Conductive metal shoulder high conductive graphene fibers. The research results published in the international well-known periodical ACS Nano ("American Chemical Society nano") on.
By understanding, the limit of conductive properties of conductive materials is superconducting, that is, the conductor resistance is zero. Whether the development of graphene fibers with superconducting properties and the realization of non-destructive current transmission is the direction that the super-subject group has been trying to overcome. Based on the previous work, the superb project group prepared graphene fibers intercalated with metal calcium by gas phase intercalation reaction, and tested the relationship between the conductivity and the temperature. It is found that the resistance of calcium intercalated graphene fibers decreases sharply when the temperature is reduced to 11K and shows the superconductor properties. When the temperature reaches 4K, the resistance is zero.
In addition, the intrinsic properties of the superconductivity of calcium-intercalated graphene fibers have also been confirmed by the magnetic characterization. Magneto-calcium intercalated graphene fibers are the first macroscopic carbon superconducting fibers with a superconducting transition temperature of 11K, comparable to commercial NbTi superconducting wires. With the improvement of the preparation process, the superconducting transition interval will be further narrowed and the superconducting transition temperature will further increase. The new lightweight superconducting fibers have broad application prospects in the field of cryogenic physics, medical magnetic resonance imaging, superconducting quantum interference, future power transmission, aerospace and other fields.
The first author of the thesis is Ph.D. candidate Liu Yingjun. This research result was completed by Professor Gao and the research group Xuemengqi and Chen Genfu, Institute of Physics, Chinese Academy of Sciences. The research was supported by the National Natural Science Foundation of China.