Direct spinning and densification method for high-performance carbon nanotube fibers

Abstract

Developing methods to assemble nanomaterials into macroscopic scaffolds is of critical significance at the current stage of nanotechnology. However, the complications of the fabrication methods impede the widespread usages of newly developed materials even with the superior properties in many cases. Here, we demonstrate the feasibility of a highly-efficient and potentially-continuous fiber-spinning method to produce high-performance carbon nanotube (CNT) fiber (CNTF). The processing time is <1 min from synthesis of CNTs to fabrication of highly densified and aligned CNTFs. CNTFs that are fabricated by the developed spinning method are ultra-lightweight, strong (specific tensile strength = 4.08 ± 0.25 Ntex −1 ), stiff (specific tensile modulus = 187.5 ± 7.4 Ntex −1 ), electrically conductive (2,270 S m 2 kg −1 ), and highly flexible (knot efficiency = 48 ± 15%), so they are suitable for various high-value fabric-based applications.

Effect of Applied Pressure on the Electrical Resistance of Carbon Nanotube Fibers

“…The observed increase in resistance on both scales rules out the possibility that this is caused by a quantum well. The resistance range measured here would give a conductivity on the order of MS/m, which is in agreement with resistance measurements made by other groups on spun carbon nanotube fibers [11,12].…”

“…The observed increase in resistance on both scales rules out the possibility that this is caused by a quantum well. The resistance range measured here would give a conductivity on the order of MS/m, which is in agreement with resistance measurements made by other groups on spun carbon nanotube fibers [11,12]. Another potential reason for the observed changes in resistance could be the formation of a quantum well under the tip, creating discrete energy states and therefore limiting current flow [27].…”

“…Another method involves drawing CNTs directly from a chemical vapor deposition (CVD) furnace [ 9 , 10 ]. It has been reported that CNT fibers have high conductivities on the order of MS/m and are comparable in terms of specific conductivity to metals [ 11 , 12 ]. However, irrespective of the method of manufacture, it has been found that the purity of the resulting fibers is commonly sub-optimal and hence their conductivity is never as good as it could be.…”

Parity symmetry in a number of problems of quantum and structural chemistry

“…Здесь мы проиллюстрируем применение (6) для интересного класса наноструктур -боразотных нанотрубок (сокращенно BNNT), исследованных во многих экспериментальных и теоретических работах. Тема нанотрубок, особенно углеродных (сокращенно CNT), продолжает присутствовать среди активно развиваемых (см., например, [26][27][28][29]). С помощью (6) мы рассмотрим, как изменяется хюккелевский электронный спектр при переходе от CNT к BNNT.…”

Mechanical Properties and Epoxy Resin Infiltration Behavior of Carbon-Nanotube-Fiber-Based Single-Fiber Composites

“…For example, fiber-type supercapacitor [6], lithium-ion battery [7], and thermoelectric generators [8], based on direct-spun CNTFs, have been reported. Moreover, the strength of the direct-spun CNTF can be enhanced by post treatments [5,9], leading to super-strong fibers that have higher specific strength than the carbon fiber (CF) T1000, which is known as the strongest commercial carbon fiber [5]. Therefore, direct-spun next-generation fibers simultaneously exhibit strength, functionality, and productivity.…”