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Large-scale synthesis of hollow carbon fibers with ultra-large diameter by thermally controlled pyrolysis |
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| Authors: | Ye Yuan Yayuan Xiong Jianjun Li Weilong Yin Qingyu Peng Haibao Lu Yibin Li Xiaodong He |
| Affiliation: | 1. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, People's Republic of China School of Materials Science and Technology, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin, People's Republic of China;2. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, People's Republic of China;3. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, People's Republic of China Shenzhen STRONG Advanced Materials Research Institute Limited Company, Shenzhen, People's Republic of China |
| Abstract: | Hollow carbon fibers (HCF) with ultra-large diameter have been synthesized and the versatility to convert them into the corresponding carbon-based composites has been demonstrated. The hollow carbon fibers were fabricated by thermal controlled carbonization of electrospun polyacrylonitrile fibers. For the existence of inorganic silica shell during pyrolysis, heat release will be blocked at the boundary, driving the polyacrylonitrile precursor fiber to form hollow structure. The diameter of the as-prepared hollow carbon fibers can exceed 150 nm. Sol-gel-derived Fe3O4 nanoparticles can grow on the outer-surface and the inner-surface of hollow carbon fibers. The microwave absorption performance of ternary HCF@Fe3O4@PPy composite is testified and the values of reflection loss exceeding −10 dB can be obtained in the frequency of 3.3-11.3 GHz. The large diameter of hollow carbon fibers can have inner and outer interfaces in the corresponding composites, which make them great potential for a variety of applications in future. |
| Keywords: | carbon fibers electrospinning sol-gel |