Son Wonkyeong, Lee Jae Myeong, Chun Sungwoo, Yu Seongjun, Noh Jun Ho, Kim Hyeon Woo, Cho Sung Beom, Kim Seon Jeong, Choi Changsoon
Department of Energy and Materials Engineering, Dongguk University, 30 Pildong-ro, 1-gil, Jung-gu, Seoul 04620, Republic of Korea.
Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Mar 15;15(10):13484-13494. doi: 10.1021/acsami.2c20666. Epub 2023 Feb 28.
Recently, several attempts have been made to activate or functionalize macroscopic carbon nanotube (CNT) yarns to enhance their innate abilities. However, a more homogeneous and holistic activation approach that reflects the individual nanotubes constituting the yarns is crucial. Herein, a facile strategy is reported to maximize the intrinsic properties of CNTs assembled in yarns through an electrochemical inner-bundle activation (EIBA) process. The as-prepared neat CNT yarns are two-end tethered and subjected to an electrochemical voltage (vs Ag/AgCl) in aqueous electrolyte systems. Massive electrolyte infiltration during the EIBA causes swelling of the CNT interlayers owing to the tethering and subsequent yarn shrinkage after drying, suggesting activation of the entire yarn. The EIBA-treated CNT yarns functionalized with oxygen-containing groups exhibit enhanced wettability without significant loss of their physical properties. The EIBA effect of the CNTs is experimentally demonstrated by hydration-driven torsional actuation (∼986 revolutions/m) and a drastic capacitance improvement (approximately 25-fold).
最近，人们进行了几次尝试来激活宏观碳纳米管（CNT）纱线或使其功能化，以增强其固有性能。然而，一种更均匀、更全面的激活方法至关重要，这种方法能够反映构成纱线的单个纳米管的情况。在此，报道了一种简便的策略，通过电化学内束激活（EIBA）过程来最大化纱线中组装的碳纳米管的固有性能。所制备的纯碳纳米管纱线两端被束缚，并在水性电解质体系中施加电化学电压（相对于Ag/AgCl）。EIBA过程中大量电解质的渗入由于束缚作用导致碳纳米管层间膨胀，干燥后纱线随后收缩，这表明整个纱线被激活。经EIBA处理且带有含氧基团功能化的碳纳米管纱线表现出增强的润湿性，而其物理性能没有显著损失。碳纳米管的EIBA效应通过水合驱动的扭转驱动（约986转/米）和显著的电容改善（约25倍）得到实验证明。
