Floating catalytic chemical vapor deposition (FCCVD) is an attractive method for synthesizing carbon nanotube (CNT) fibers of high strength, toughness and electrical conductivity. During the process of CNT fibers synthesis, the assembly structure, such as the CNT orientation, CNT length, and the inter-tube particle impurity inside the CNT fibers, are key factors to determine the mechanical properties of CNT fibers. However, the regulation mechanism of the assembly structure during the process of CNT fiber synthesis is still unclear. Herein, in order to obtain high-strength CNT fibers, we demonstrated the synergistic relationship between the orientation and length of CNT inside the CNT fibers during the FCCVD growth process by adjusting the winding rate (5–30 m/min) and the length of the high-temperature reaction zone (660–1060 mm). It also revealed that the particle impurities inside the fibers could greatly reduce mechanical strength of CNT fibers. By optimizing the assembly structure of CNT fibers, the stable and continuous synthesis was realized, with the specific tensile strength of 3.1 N/tex (~ 3.5 GPa) without any post-treatment process.

浮式催化化学气相沉积（FCCVD）是用于合成高强度，韧性和导电性的碳纳米管（CNT）纤维的一种有吸引力的方法。在碳纳米管纤维合成过程中，碳纳米管的取向，碳纳米管长度，碳纳米管内部的管间杂质等组装结构是决定碳纳米管力学性能的关键因素。然而，在CNT纤维合成过程中组装结构的调节机制仍不清楚。在这里，为了获得高强度的CNT纤维，我们通过调节缠绕速率（5-30 m / min）和缠绕长度来证明FCCVD生长过程中CNT纤维内部CNT的方向和长度之间的协同关系。高温反应区（660-1060毫米）。这也表明，纤维内部的颗粒杂质会大大降低CNT纤维的机械强度。通过优化CNT纤维的组装结构，可以实现稳定，连续的合成，比抗张强度为3.1 N / tex（〜3.5 GPa），无需任何后处理过程。