Abstract
In this work, an ionic polymer–polymer composites (IP2Cs) was developed as piezoionic sensors based on Aquivion® perfluorinated conducting membranes and modified PEDOT:PSS electrodes. The influence of solvent annealing, additive concentration and its nature (ionic liquid (IL), Aquivion®,…) on the electronic conductivity and the mechanical properties of modified PEDOT:PSS electrodes is investigated. The design of flexible free-standing PEDOT:PSS electrodes provides a new way of IP2Cs conception. Tri-layers are elaborated either by drop-casting or by thermocompressing of electrodes on top of commercial Aquivion® membranes swelled by an IL 1-ethyl-3-methylimidazolium bis (trifluoromethyl-sulfonyl) imide. The open-circuit voltage output is measured during bending stimulation experiments as function of the mechanical perturbation amplitude. These IP2Cs made from Aquivion® behaves as soft mechanical strain sensors with large electrical output signal as high as ΔE = 2.9 mV (Δϵ = ±2%) under optimal conditions. The influence of the IP2C’s manufacturing process, grade of Aquivion® membrane, and electrode’s properties is investigated. This study emphasized the significant contribution of the electrode’s mechanical properties that appears as a critical parameter for the development of high performance piezoionic sensors. In the near future, we will explore the opportunity to employ these Aquivion®-based IP2Cs as soft strain sensors for robotic and medical applications.
Published Version
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