Bidirectionally promoting assembly order for ultrastiff and highly thermally conductive graphene fibres

Peng Li, Ziqiu Wang, Yuxiang Qi, Gangfeng Cai, Yingjie Zhao, Xin Ming, Zizhen Lin, Weigang Ma, Jiahao Lin, Hang Li, Kai Shen, Yingjun Liu (), Zhen Xu (), Zhiping Xu () and Chao Gao ()
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Peng Li: Zhejiang University
Ziqiu Wang: Zhejiang University
Yuxiang Qi: Zhejiang University
Gangfeng Cai: Zhejiang University
Yingjie Zhao: Tsinghua University
Xin Ming: Zhejiang University
Zizhen Lin: Tsinghua University
Weigang Ma: Tsinghua University
Jiahao Lin: Zhejiang University
Hang Li: Zhejiang University
Kai Shen: Zhejiang University
Yingjun Liu: Zhejiang University
Zhen Xu: Zhejiang University
Zhiping Xu: Tsinghua University
Chao Gao: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Macroscopic fibres assembled from two-dimensional (2D) nanosheets are new and impressing type of fibre materials besides those from one-dimensional (1D) polymers, such as graphene fibres. However, the preparation and property-enhancing technologies of these fibres follow those from 1D polymers by improving the orientation along the fibre axis, leading to non-optimized microstructures and low integrated performances. Here, we show a concept of bidirectionally promoting the assembly order, making graphene fibres achieve synergistically improved mechanical and thermal properties. Concentric arrangement of graphene oxide sheets in the cross-section and alignment along fibre axis are realized by multiple shear-flow fields, which bidirectionally promotes the sheet-order of graphene sheets in solid fibres, generates densified and crystalline graphitic structures, and produces graphene fibres with ultrahigh modulus (901 GPa) and thermal conductivity (1660 W m−1 K−1). We believe that the concept would enhance both scientific and technological cognition of the assembly process of 2D nanosheets.

Date: 2024
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DOI: 10.1038/s41467-024-44692-7

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