Single Carbon Fibers with a Macroscopic‐Thickness, 3D Highly Porous Carbon Nanotube Coating |
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Authors: | Mingchu Zou Wenqi Zhao Huaisheng Wu Hui Zhang Wenjing Xu Liusi Yang Shiting Wu Yunsong Wang Yijun Chen Lu Xu Anyuan Cao |
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Affiliation: | 1. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, China;2. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, China |
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Abstract: | Carbon fiber (CF) grafted with a layer of carbon nanotubes (CNTs) plays an important role in composite materials and other fields; to date, the applications of CNTs@CF multiscale fibers are severely hindered by the limited amount of CNTs grafted on individual CFs and the weak interfacial binding force. Here, monolithic CNTs@CF fibers consisting of a 3D highly porous CNT sponge layer with macroscopic‐thickness (up to several millimeters), which is directly grown on a single CF, are fabricated. Mechanical tests reveal high sponge–CF interfacial strength owing to the presence of a thin transitional layer, which completely inhibits the CF slippage from the matrix upon fracture in CNTs@CF fiber–epoxy composites. The porous conductive CNTs@CF hybrid fibers also act as a template for introducing active materials (pseudopolymers and oxides), and a solid‐state fiber‐shaped supercapacitor and a fiber‐type lithium‐ion battery with high performances are demonstrated. These CNTs@CF fibers with macroscopic CNT layer thickness have many potential applications in areas such as hierarchically reinforced composites and flexible energy‐storage textiles. |
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Keywords: | carbon fiber carbon nanotubes fiber supercapacitors interfacial strength multiscale hybrid fiber |
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