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Article Dans Une Revue ACS Applied Polymer Materials Année : 2021

Electrical and mechanical properties of intrinsically flexible and stretchable PEDOT polymers for thermotherapy

Résumé

For wearable applications such as electronic skin and biosensors, stretchable conductors are required (∼30% strain to follow the skin extension). Owing to its high conductivity, good flexibility, low cost, and ease of processing, poly(3,4-ethylenedioxythiophene) (PEDOT) appears as a promising candidate. However, destructive cracks come out above 10% strain in the case of PEDOT:PSS, the most common form of PEDOT. Different strategies have already been investigated to solve this problem, including the design of specific structures or the addition of plasticizers. This article presents a different approach to obtain highly conductive and stretchable PEDOT materials based on doping with small counteranions. We indeed demonstrate the intrinsic stretchability (up to 30% strain) of thin films (35 nm) of PEDOT-based materials with small counterions. Both thin-PEDOT:OTf (triflate counter-ion) and thin-PEDOT:Sulf (sulfate counter-ion) films remain structurally resilient up to 25–30% strain, and their electrical conductivity remains remarkably stable over more than 100 cycles. Under limited strain (<30%), polarized UV–vis–NIR measurements (parallel and perpendicular to the stretching direction) show that the conductivity of the material is improved by chain alignment in the stretching direction. As a proof of concept, a thermotherapy patch is presented. It shows a fine temperature control (stability around 40 °C at 9 V bias) and a uniform heating across the surface.
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Dates et versions

hal-03636178 , version 1 (25-01-2023)

Identifiants

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Amélie Schultheiss, Amélie Revaux, Alexandre Carella, Martin Brinkmann, Huiyan Zeng, et al.. Electrical and mechanical properties of intrinsically flexible and stretchable PEDOT polymers for thermotherapy. ACS Applied Polymer Materials, 2021, 3 (11), pp.5942-5949. ⟨10.1021/acsapm.1c01203⟩. ⟨hal-03636178⟩
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