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Anisotropically Conductive Hydrogels with Directionally Aligned PEDOT:PSS in a PVA Matrix
Yong-Woo Kim1,2, Jae-Man Park1,2, Chang Seo Park1,2
1Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Abstract:
Electrical anisotropy, which is characterized by the efficient transmission of electrical signals in specific directions, is prevalent in both natural and engineered systems. However, traditional anisotropically conductive materials are often rigid and dry, thus limiting their utility in applications aiming for the seamless integration of various technologies with biological tissues. In the present study, we introduce a method for precisely controlling the microstructures of conductive and insulating polymers to create highly anisotropically conductive composite hydrogels. Our methodology involves combining aligned poly(vinyl alcohol) microfibrils, infused poly(3,4-ethylenedioxythiophene) polystyrenesulfonate, and sodium citrate precipitation to form dense, aligned conductive paths. This significantly enhances the electrical conductivity anisotropy (σ∥/σ⊥ ≈ 60.8) within these composite hydrogels.
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