Abstract
Utilizing the superior properties of individual carbon nanotubes (CNTs), the production of continuous CNT fibers has paved the way for novel CNT macroscale applications. However, it is still a great challenge to create highly electrically-conductive CNT fibers due to the poor transfer of electrical property from nanoscale individual CNTs to macroscale CNT fibers. Here, we report a fast and effective post treatment method consisting of mechanical condensation and acid treatment to enhance the electrical conductivity of the CNT fiber by a factor of 9. Such great enhancement is attributed to the surface modification effects during the post treatments, resulting in the lower contact resistance and stronger inter-CNT interactions. Moreover, the maximum current density of the acid-treated CNT fiber is up to 66000A/cm2, competitive to the conventional copper wires. The promising results in this study enable the CNT fibers novel materials for electrical wiring applications.
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