Dielectric Properties of Single-walled Carbon Nanotube/Poly(dimethylsiloxane) Nanocomposites Gelated with Ionic Liquids

Title
Dielectric Properties of Single-walled Carbon Nanotube/Poly(dimethylsiloxane) Nanocomposites Gelated with Ionic Liquids
Authors
오기원이상수김대흠김희숙
Issue Date
2012-04
Publisher
Materials Research Society
Abstract
Polymer-based nanocomposites filled with inorganic fillers have been intensively studied due to their excellent mechanical, electrical, thermal and dielectric properties. Especially, the dielectric properties of polymer/inorganic nanocomposites have been examined for not only embedded-capacitor technology but also electroactive polymers (EAPs) that respond to the external electric field by changing their shape. Recently, a considerable amount of studies have focused on reducing the operating voltages of dielectric elastomer actuators (DEAs) in order to enhance their commercial feasibility and remove the dangers associated with high voltage. The basic method for reducing the operating voltage is to increase the dielectric constant of the elastomer films. A number of approaches have been explored for increasing the dielectric constant of elastomers introducing high-k ceramic fillers or conductive fillers such as metal nanoparticles and nanocarbons. In this study, we fabricated a dielectric elastomer films using single-walled carbon nanotubes (SWNTs) as a dielectric filler and polydimethylsiloxane (PDMS) as a polymer matrix. To achieve a high dielectric constant and low loss factor of SWNTs/PDMS nanocomposites, the SWNTs were highly exfoliated by using an ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide. We demonstrate that SWNTs/PDMS nanocomposites with ionic liquids show the higher dielectric constant and lower loss factor than nanocomposites without ionic liquids. We also characterize the dispersity of SWNTs in the nanocomposites by transmission electron microscopy (TEM) and scanning electron microscopy (SEM).
URI
http://pubs.kist.re.kr/handle/201004/42591
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KIST Publication > Conference Paper
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