title: High-speed carbon nanotube actuators based on an oxidation/reduction reaction.
abstract: Actuators with a high-speed response under a high-frequency (more than 100 Hz) applied square-wave voltage of ±2 V have been developed with an electrode composed of millimeter-long single-walled carbon nanotubes synthesized by the "supergrowth method" (SG-SWNTs) and ionic liquids (ILs). Detailed studies concerning induced electric current and transferred charge in the electrode as well as cyclic voltammetric studies of the electrode revealed that the high-speed response originates from the electric current generated by an oxidation/reduction (redox) reaction in addition to electric double-layer charging. The contribution of the redox reactions of SG-SWNTs to the actuation is sensitive to the presence of supporting polymers, the thickness of the electrolyte, and the amplitude of the applied voltage.
authors.affiliation: Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan. mukai-ken@aist.go.jp
authors.forename: Ken
authors.initials: K
authors.lastname: Mukai
authors.forename: Kinji
authors.initials: K
authors.lastname: Asaka
authors.forename: Kenji
authors.initials: K
authors.lastname: Hata
authors.forename: Toribio Fernández
authors.initials: TF
authors.lastname: Otero
authors.forename: Hideaki
authors.initials: H
authors.lastname: Oike
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D004867:Equipment Design; D052578:Ionic Liquids / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D004573:Electrolytes; D052578:Ionic Liquids; D037742:Nanotubes, Carbon