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Figure 1: "Medium" in the weaving of graphene fibers (black) Figure 2: A four-meter-long graphene fiber Recently, the high-tech group of the University of Zhejiang University made a long-term number of nano-sized graphene oxide sheets. The macroscopic graphene fiber of rice. The prepared fiber not only has high strength but also good toughness, and can be knotted or woven into a conductive mat. Such fibers are likely to be key materials for the implementation of graphene in real-life devices such as flexible batteries and solar cells. Related papers were published in the latest issue of Nature-Communication, and the online news of Nature magazine was also featured. Graphene has broad application prospects in the fields of transistors, nanostructures and functional composite materials, and lithium ion batteries. But it also has a "bad temper" that is difficult to dissolve. In addition, due to the low solubility and lack of assembly methods, how to achieve the macroscopic fibers of ordered arrangement of graphene becomes a major challenge. The superb group found a way to efficiently arrange tiny (one-micron wide) two-dimensional carbon nanosheets into macroscopic materials. They used an industrial process called wet spinning to spin an aqueous solution of graphene oxide, a readily soluble graphene derivative, into fibers up to several meters long. Then, it is treated by a chemical reduction method to obtain a graphene long fiber. "In recent years, great progress has been made in the study of the properties of graphene, but before our research, it is difficult to imagine how to convert graphene sheets of less than one nanometer thick into macroscopic fiber materials." Gao Chao introduced. The group's preparation of graphene fibers is to prepare a high concentration of pure graphene oxide solution. Although this seemingly semi-solid, semi-liquid dispersion can flow like a viscous liquid, the graphene oxide macromolecules are spontaneously aligned. Gao Chao explained: "It is this orderly internal structure that allows us to obtain a liquid crystal dispersion that can be used well for fiber spinning." According to reports, this graphene fiber is spun in aqueous solution at room temperature. It can be prepared, and its preparation process is convenient, fast and green. How to improve the mechanical strength of graphene fiber is the next goal of this group. "Although the mechanical strength of graphene fibers is still far from that of carbon fiber (its toughness is much better than carbon fiber), we believe that there is still a lot of room for improvement." Gao Chao said.