Minseouk Choi, Young Shik Cho, Kyunbae Lee, Yeonsu Jung, Kyung Tae Park and Taehoon Kim
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引用次数: 0
摘要
由于金属的固有局限性,例如热氧化和膨胀导致的高温性能差,碳纳米管纱线(CNTF)因其高导电性和热稳定性而成为有前途的替代品。掺杂 CNTF 可以通过简单的工艺显著提高导电性,因此被广泛研究。尽管具有这些优点,掺杂的 CNTFs 并不适合极端环境,尤其是高温环境。这是由于掺杂剂与 CNTF 之间的相互作用较弱,而且掺杂剂本身的热稳定性较低,导致掺杂剂在高温下分解和氧化。在此,我们提出了掺杂了由亚胺基团和硝基基团组成的氮化合物共价官能化的 CNTF,这种氮化合物具有良好的热稳定性。这种氮化合物的抽电子效应可将 CNTF 极化为正电荷,从而产生 p 型掺杂效应,并将导电率从 2989 S cm-1 提高到 4008 S cm-1。氮化合物与 CNTF 之间的强共价键以及掺杂剂的热稳定性确保了掺杂 CNTF 在 300 °C 退火 12 小时后仍能保持导电性。
Advanced doping method for highly conductive CNT fibers with enhanced thermal stability
Due to the inherent limitations of metals, such as their poor performance at high temperatures caused by thermo-oxidation and expansion, carbon nanotube yarns (CNTFs) have emerged as promising alternatives because of their high electrical conductivity and thermal stability. Doping of CNTFs has been widely studied because it significantly increases electrical conductivity through a simple process. Despite these advantages, doped CNTFs are not suitable for extreme environments, especially high temperatures. This is due to the weak interaction between dopants and CNTFs, along with the low thermal stability of the dopants themselves, leading to dopant decomposition and oxidation at high temperatures. Herein, we present doped CNTFs that are covalently functionalized with a nitrogen compound composed of imide and nitro groups, which are renowned for good thermal stability. The electron-withdrawing effect of this nitrogen compound polarizes the CNTFs to a positive charge, inducing p-type doping effects and enhancing electrical conductivity from 2989 to 4008 S cm−1. The strong covalent bonding between the nitrogen compound and CNTFs, along with the thermal stability of the dopants, ensures that the electrical conductivity of our doped CNTFs is maintained even after annealing at 300 °C for 12 h. Our proposed doped CNTFs offer a guideline for expanding the practical applications of doped CNTFs to a wider range of high-temperature environments.