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Applied Physics A

, Volume 110, Issue 2, pp 281–307 | Cite as

Flexible and stretchable electrodes for dielectric elastomer actuators

  • Samuel RossetEmail author
  • Herbert R. Shea
Invited paper

Abstract

Dielectric elastomer actuators (DEAs) are flexible lightweight actuators that can generate strains of over 100 %. They are used in applications ranging from haptic feedback (mm-sized devices), to cm-scale soft robots, to meter-long blimps. DEAs consist of an electrode-elastomer-electrode stack, placed on a frame. Applying a voltage between the electrodes electrostatically compresses the elastomer, which deforms in-plane or out-of plane depending on design. Since the electrodes are bonded to the elastomer, they must reliably sustain repeated very large deformations while remaining conductive, and without significantly adding to the stiffness of the soft elastomer. The electrodes are required for electrostatic actuation, but also enable resistive and capacitive sensing of the strain, leading to self-sensing actuators. This review compares the different technologies used to make compliant electrodes for DEAs in terms of: impact on DEA device performance (speed, efficiency, maximum strain), manufacturability, miniaturization, the integration of self-sensing and self-switching, and compatibility with low-voltage operation. While graphite and carbon black have been the most widely used technique in research environments, alternative methods are emerging which combine compliance, conduction at over 100 % strain with better conductivity and/or ease of patternability, including microfabrication-based approaches for compliant metal thin-films, metal-polymer nano-composites, nanoparticle implantation, and reel-to-reel production of μm-scale patterned thin films on elastomers. Such electrodes are key to miniaturization, low-voltage operation, and widespread commercialization of DEAs.

Keywords

Dielectric elastomer actuators Compliant electrodes Carbon Metal thin-films 

Notes

Acknowledgements

The authors wish to express their sincere thanks professor Siegfried Bauer for his precious advices regarding the preparation of the manuscript. The authors also thank Samin Akbari, Luc Maffli, and Benjamin O’Brien for their helpful collaboration. This work was supported by the Swiss National Science foundation grant 200020-140394, COST action MP1003, and the Indo Swiss joint research programme (ISJRP).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Ecole Polytechnique Fédérale de Lausanne (EPFL)NeuchâtelSwitzerland

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