The commercial conducting materials (Cu, Ag, Al etc.) have achieved their saturation due to their high density and Joule’s heating effect in terms of efficiency. In this outlook, carbon nanotubes (CNTs) are the most versatile, light weight and high electrically conducting material for advance generation. But it is difficult to weave them for commercialization. For the growth of 3-D CNT assemblies such as CNT fiber, CNT sheet, CNT rope and CNT ribbon, direct spinning is the most suitable technique because of its simplicity for continuous growth of CNT fiber. In the present work, different growth parameters were analysed for the growth of CNT fibers. The growth of CNT fibres has been carried out through direct spinning of as-synthesised CNT aerogel. CNT fibers were grown successfully via optimizing different processing parameters like temperature, pressure and argon to hydrogen ratio. The morphology of as-spun fibers was investigated via microscopic techniques such as optical microscopy, SEM and TEM. Moreover, the defects and metallicity of as-spun fibers have been analysed using Raman spectroscopy. The change in resistance with change in temperature was also measured for quality of as-made CNT fiber which shows metallic behavior as CNT fiber has positive temperature coefficient. Above 151K, conducting CNTs are dominating and below this temperature, semiconducting CNTs are showing their nature in R v/s T curve. Furthermore, the measured electrical conductivity of as-made fiber is 3.9×10³ S/m. These as-spun metallic fibers can outperform the currently used Cu wire. Hence, as-synthesized conductive CNT fibers have great potential as conducting wires.

中文翻译：

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导线直接纺丝法合成碳纳米管纤维

商业用导电材料（Cu，Ag，Al等）由于其高密度和焦耳在效率方面的加热效果而达到饱和。在这种情况下，碳纳米管（CNT）是最先进，用途最广，重量最轻且导电性最高的材料。但是很难将它们编织起来进行商业化。对于生长3D CNT组件（例如CNT纤维，CNT片，CNT绳和CNT带）而言，直接纺丝是最合适的技术，因为它易于连续生长CNT纤维。在目前的工作中，分析了不同的生长参数以用于CNT纤维的生长。CNT纤维的生长是通过直接合成的CNT气凝胶直接纺丝进行的。通过优化不同的加工参数（例如温度，压力和氩氢比。通过诸如光学显微镜，SEM和TEM的显微技术研究了初纺纤维的形态。此外，已经使用拉曼光谱法分析了初纺纤维的缺陷和金属性。还测量了制成的CNT纤维质量随温度变化的电阻变化，该质量显示出金属行为，因为CNT纤维具有正温度系数。高于151K时，导电CNT占主导地位，低于此温度，半导体CNT在R v / s T曲线中显示其性质。此外，测得的成品纤维的电导率为3.9×10 3 S / m。这些初纺金属纤维的性能可能优于目前使用的铜线。因此，合成后的导电CNT纤维具有作为导线的巨大潜力。通过诸如光学显微镜，SEM和TEM的显微技术研究了初纺纤维的形态。此外，已经使用拉曼光谱法分析了初纺纤维的缺陷和金属性。还测量了制成的CNT纤维质量随温度变化的电阻变化，该质量显示出金属行为，因为CNT纤维具有正温度系数。高于151K时，导电CNT占主导地位，低于此温度，半导体CNT在R v / s T曲线中显示其性质。此外，测得的成品纤维的电导率为3.9×10 3 S / m。这些初纺金属纤维的性能可能优于目前使用的铜线。因此，合成后的导电CNT纤维具有作为导线的巨大潜力。通过诸如光学显微镜，SEM和TEM的显微技术研究了初纺纤维的形态。此外，已经使用拉曼光谱法分析了初纺纤维的缺陷和金属性。还测量了制成的CNT纤维质量随温度变化的电阻变化，该质量显示出金属行为，因为CNT纤维具有正温度系数。高于151K时，导电CNT占主导地位，低于此温度，半导体CNT在R v / s T曲线中显示其性质。此外，测得的成品纤维的电导率为3.9×10 3 S / m。这些初纺金属纤维的性能可能优于目前使用的铜线。因此，合成后的导电CNT纤维具有作为导线的巨大潜力。