Abstract
The carbon nanotube fiber (CNT fiber) represents a remarkable advancement in harnessing nano-level properties akin to those of individual CNTs in macrostructure. The most essential step in achieving this is to densify the CNTs within the fiber. Among various densification techniques, twisting has emerged as one of the prominent methods due to its continuous nature. In this study, we conducted in-situ continuous twisting of CNT fibers synthesized by floating catalyst chemical vapour deposition alongside ex-situ twisting experiments for comparative analysis. Through focused ion beam analysis, we probed the effect of twisting on the densification of CNT fibers, revealing pore elimination and complete fiber densification as outcomes. Intriguingly, in-situ twisting yielded higher density compared to ex-situ twisting despite identical twist levels maintained in both methods. We unraveled the mechanism behind this superior density achieved through in-situ densification. Furthermore, in-situ twisted fibers exhibited superior tensile strength and electrical conductivity when compared to their ex-situ twisted fiber. The in-situ twisting process demonstrated remarkable enhancements, with electrical conductivity increasing by up to 254 % and tensile strength by 125 % compared to untwisted fibers.
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