Intensive efforts are underway to integrate the distinct properties of individual carbon nanotubes (CNTs) into their assemblies and meet the growing demand for lightweight and strong materials. This study achieved CNT fibers (CNTFs) with high specific tensile strength (4.97 N/tex) and specific modulus (206.8 N/tex) by designing all-ring type bridges between CNTs. This reinforcement strategy involves suppressing the distortion of CNTs and promoting effective crosslinks within the fiber structure to increase the total inter-bundle interactions. The molecular-level network within the linking segment reduces vulnerability at the typically weak connection points and enhances load-transfer efficiency between crosslinked CNTs. In addition to improvements in mechanical properties, incorporating dopant groups in the bridge enhanced the electrical conductivity, reaching up to 2086 S m/kg. This strategy provides straightforward access to multifunctional fibers beyond those of commercially accessible or literature-reported benchmark fibers.

中文翻译：

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高性能碳纳米管纤维交联剂的分子级网络工程

人们正在加紧努力，将单个碳纳米管 (CNT) 的独特特性集成到其组件中，以满足对轻质和坚固材料不断增长的需求。本研究通过设计CNT之间的全环型桥，获得了具有高比拉伸强度（4.97 N/tex）和比模量（206.8 N/tex）的CNT纤维（CNTF）。这种增强策略包括抑制碳纳米管的变形并促进纤维结构内的有效交联，以增加总束间相互作用。连接段内的分子级网络减少了典型薄弱连接点的脆弱性，并提高了交联碳纳米管之间的负载转移效率。除了机械性能的改进之外，在桥中加入掺杂剂基团还增强了电导率，达到 2086 S m/kg。该策略提供了直接获得多功能纤维的途径，超越了市售或文献报道的基准纤维。