4.8 Article

Enhanced Hydro-Actuation and Capacitance of Electrochemically Inner-Bundle-Activated Carbon Nanotube Yarns

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 10, Pages 13484-13494

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c20666

Keywords

electrochemical activation; inner bundles; carbon nanotube yarns; hydro-actuations; capacitances

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A facile strategy of electrochemical inner-bundle activation (EIBA) is reported to enhance the properties of CNT yarns. The EIBA-treated yarns exhibit enhanced wettability, improved torsional actuation, and increased capacitance.
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 (similar to 986 revolutions/m) and a drastic capacitance improvement (approximately 25-fold).

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