材料科学
聚丙烯腈
结晶度
石墨烯
导电体
热导率
复合材料
微晶
电导率
氧化物
碳纤维
热的
纳米技术
聚合物
复合数
冶金
物理化学
气象学
化学
物理
作者
Xing Ming,Anran Wei,Yingjun Liu,Peng Li,Peng Li,Jiaqing Wang,Sengping Liu,Wenzhang Fang,Ziqiu Wang,H-X Peng,Jiahao Lin,Haoguang Huang,Zhanpo Han,Shiyu Luo,Min Cao,Bo Wang,Zheng Liu,Fenglin Guo,Zhen Xu,Jiabin Xi
标识
DOI:10.1002/adma.202201867
摘要
Highly thermally conductive carbon fibers (CFs) have become an important material to meet the increasing demand for efficient heat dissipation. To date, high thermal conductivity has been only achieved in specific pitch-based CFs with high crystallinity. However, obtaining high graphitic crystallinity and high thermal conductivity beyond pitch-CFs remains a grand challenge. Here, a 2D-topology-seeded graphitization method is presented to mediate the topological incompatibility in graphitization by seeding 2D graphene oxide (GO) sheets into the polyacrylonitrile (PAN) precursor. Strong mechanical strength and high thermal conductivity up to 850 W m-1 K-1 are simultaneously realized, which are one order of magnitude higher in conductivity than commercial PAN-based CFs. The self-oxidation and seeded graphitization effect generate large crystallite size and high orientation to far exceed those of conventional CFs. Topologically seeded graphitization, verified in experiments and simulations, allows conversion of the non-graphitizable into graphitizable materials by incorporating 2D seeds. This method extends the preparation of highly thermally conductive CFs, which has great potential for lightweight thermal-management materials.
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