Capacitive charging and background processes in carbon nanotube yarn actuators

Tissaphern Mirfakhrai; Mikhail Kozlov; Mei Zhang; Shaoli Fang; Ray H. Baughman; John D. W. Madden

doi:10.1117/12.715795

5 April 2007 Capacitive charging and background processes in carbon nanotube yarn actuators

Tissaphern Mirfakhrai, Mikhail Kozlov, Mei Zhang, Shaoli Fang, Ray H. Baughman, John D. W. Madden

Proceedings Volume 6524, Electroactive Polymer Actuators and Devices (EAPAD) 2007; 65241H (2007) https://doi.org/10.1117/12.715795
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

Twist-spun carbon nanotube yarns actuate when extra charge is added to the yarn. This charge can be stored in a doublelayer capacitor formed when the yarn is submersed in an electrolyte. The dependence of the actuation stress and strain on the stored charge must be studied if double layer charging models are to be fully verified over large potential ranges. However, background currents are generated in the system when an electrical potential is applied, making it hard to discern the charge stored in the actuator and the charge that passes through the cell due to faradaic processes. A model is developed to separate the capacitive and faradaic portions of the actuator current. The model is then applied to the analysis of the actuation data. The consistency of the results paves the way to understanding the real strain-charge behavior of the actuator.

Citation Download Citation

Tissaphern Mirfakhrai, Mikhail Kozlov, Mei Zhang, Shaoli Fang, Ray H. Baughman, and John D. W. Madden "Capacitive charging and background processes in carbon nanotube yarn actuators", Proc. SPIE 6524, Electroactive Polymer Actuators and Devices (EAPAD) 2007, 65241H (5 April 2007); https://doi.org/10.1117/12.715795

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