Electromechanical actuation of composite material from carbon nanotubes and ionomeric polymer.

An actuating system composed of nafion ionomeric polymer coated with single-walled carbon nanotubes electrodes was studied as an electromechanical actuator. The actuator gives a sizable mechanical response to low voltages (turn-on voltage of approximately 2.5 V) under open-air conditions, i.e., in the absence of a surrounding supporting electrolyte. The actuator is active under both dc and ac bias and has a strong resonance at low frequencies which is dependent upon the size of the actuator. The actuator was studied using Fourier transform infrared and vis-NIR spectroscopies, cyclic voltammetry, and by the current-time response under an applied step voltage. An analytical model is proposed to understand the electrical behavior, which is consistent with the spectroscopic results.

[1]  R. Nuzzo,et al.  An infrared study of the effects of hydration on cation-loaded nafion thin films , 2000 .

[2]  P. Calvert,et al.  Multilayer Hydrogels as Muscle‐Like Actuators , 2000 .

[3]  Yoseph Bar-Cohen,et al.  Electroactive Polymer (EAP) Actuators as Artificial Muscles: Reality, Potential, and Challenges, Second Edition , 2004 .

[4]  Thomas Gennett,et al.  Single Wall Carbon Nanotube−Nafion Composite Actuators , 2002 .

[5]  Kinji Asaka,et al.  Morphology of electrodes and bending response of the polymer electrolyte actuator , 2001 .

[6]  M. Dresselhaus,et al.  Carbon nanotubes : synthesis, structure, properties, and applications , 2001 .

[7]  Kinji Asaka,et al.  Bending of polyelectrolyte membrane platinum composites by electric stimuli. Part II. Response kinetics , 2000 .

[8]  Sia Nemat-Nasser,et al.  Electromechanical response of ionic polymer-metal composites , 2000 .

[9]  R. Smalley,et al.  Electronic Structure Control of Single-Walled Carbon Nanotube Functionalization , 2003, Science.

[10]  Larry R. Dalton,et al.  Pneumatic carbon nanotube actuators , 2002 .

[11]  K. Oguro,et al.  Effect on bending behavior of counter cation species in perfluorinated sulfonate membrane–platinum composite , 1998 .

[12]  A. MacDiarmid,et al.  Artificial muscle: electromechanical actuators using polyaniline films , 1994 .

[13]  Ladislav Kavan,et al.  Electrochemical Tuning of Electronic Structure of Single-Walled Carbon Nanotubes: In-situ Raman and Vis-NIR Study , 2001 .

[14]  Ray H. Baughman,et al.  Electrochemical Characterization of Single‐Walled Carbon Nanotube Electrodes , 2000 .

[15]  Sumio Iijima,et al.  Elastic Response of Carbon Nanotube Bundles to Visible Light , 1999 .