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Proceedings Paper

Mechanical properties of electroactive polymer microactuators with ion-implanted electrodes
Author(s): Samuel Rosset; Muhamed Niklaus; Philippe Dubois; Massoud Dadras; Herbert R. Shea
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Paper Abstract

We report on the use of the bulge test method to characterize the mechanical properties of miniaturized buckling-mode dielectric elastomer actuators (DEA). Our actuator consists of a Polydimethylsiloxane (PDMS) membrane bonded to a silicon chip with through holes. Compliant electrodes are fabricated on both sides of the membrane by metal ion implantation. The membrane buckles when a critical voltage is applied to the electrodes. The maximum displacements as well as the efficiency of such actuators strongly depend on the mechanical parameters of the combined electrode-elastomer-electrode layer, mainly effective Young's modulus E and residual stress &sgr;. We report measured E and &sgr; obtained from bulge tests on PDMS membranes for two PDMS brands and for several different curing methods, which allows tuning the residual stress by controlling the rate of solvent evaporation. Bulge test measurements were then used to study the change in membranes' mechanical properties due to titanium ion implantation, compared to the properties obtained from depositing an 8 nm thick gold electrode. At the doses required to create a conductive layer, we find that the Ti ion implantation has a low impact on the membrane's overall rigidity (doubling of the Young's modulus and reducing the tensile stress) compared to the Au film (400% increase in E). The ion implantation method is an excellent candidate for DEAs' electrodes, which need to be compliant in order to achieve large displacements.

Paper Details

Date Published: 4 April 2007
PDF: 11 pages
Proc. SPIE 6524, Electroactive Polymer Actuators and Devices (EAPAD) 2007, 652410 (4 April 2007); doi: 10.1117/12.714944
Show Author Affiliations
Samuel Rosset, École Polytechnique Fédérale de Lausanne (Switzerland)
Muhamed Niklaus, École Polytechnique Fédérale de Lausanne (Switzerland)
Philippe Dubois, École Polytechnique Fédérale de Lausanne (Switzerland)
Massoud Dadras, Univ. of Neuchâtel (Switzerland)
Herbert R. Shea, École Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 6524:
Electroactive Polymer Actuators and Devices (EAPAD) 2007
Yoseph Bar-Cohen, Editor(s)

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