Abstract: This study explores the continuous and scalable fabrication of high-performance carbon nanotube fibers (CNTFs). The process starts with chemical vapor deposition (CVD) and continues with post-treatment to enhance the structure and properties of the fibers. In the CVD stage, two main parameters—nozzle temperature and drawing speed—are adjusted to control CNT alignment and fiber morphology. A higher nozzle temperature promotes CNT growth and orientation. A faster drawing speed helps reduce internal defects and improves structural uniformity. Scanning electron microscopy (SEM) is used to observe the CNT packing inside the fibers. Tensile tests and conductivity measurements are performed to evaluate the mechanical and electrical properties.
The experimental results show that the optimal processing conditions are a nozzle temperature of 500 °C and a drawing speed of 15 mm/min. Under these parameters, CNTF achieves a tensile strength of 283 MPa, a Young's modulus of 1.63 GPa, and an electrical conductivity of 2.48 × 10⁵S/m. The maximum continuous fiber length exceeds 3,000 meters. This confirms the stability and reproducibility of the optimized CVD process. SEM images reveal that the CNTs are well-aligned and tightly packed, which supports better load transfer and smoother electron pathways in the fibers.
After fiber formation, post-treatment is applied to further improve performance. The CNTFs are soaked in chlorosulfonic acid (CSA) for 60 seconds. This step softens the structure and promotes rearrangement of the nanotube bundles. Then, a pre-tension of 2.5 cN is applied and maintained for 6 hours to lock in the alignment. Finally, the fibers undergo 20 cycles of rolling compression with stepwise increasing pressure. This treatment improves inter-tube contact, removes internal voids, and makes the fibers more compact. After post-processing, the tensile strength of CNTF increases to 2.6 GPa, with a Young's modulus of 41.8 GPa, and the electrical conductivity improves to 3.83 ×10⁶ S/m. These values approach the theoretical performance limits of CNTs. The method developed in this work provides a simple and reliable way to produce CNTF for use in flexible electronics, aerospace materials, and other advanced composites.

Key words: CNTF, chemical vapor deposition, chlorosulfonic acid, rolling compression, mechanical properties, electrical conductivity 

摘要： 为了实现碳纳米管纤维（CNTF）的高性能连续化制备，通过浮动催化化学气相沉积法（FCCVD）双参数调控策略，对CNTF进行连续化制备，优化成纤稳定性；并在此基础上对CNTF进行高性能强化工艺处理，逐级提高其力/电性能。结果表明：在500 °C出液口温度与15 m/min牵伸速率的条件下，CNTF可以实现200 min以上连续出丝，长度超过3000 m。在氯磺酸中浸渍60 s后，通过2.5 cN张力静置6 h及20次以上逐级递增压力辊压，CNTF的力学性能与导电性能得到显著提升，断裂强度达2.6 GPa，模量达41.8 GPa，电导率达3.83×106 S/m。研究结果可为高性能CNTF的稳定制备与工程化应用提供理论与工艺参考。

关键词: CNTF, 化学气相沉积, 氯磺酸, 辊压压缩, 力学性能, 导电性