Highly Stretchable, Conductive, and Transparent PDMS Island‐Continuous PEDOT:PSS Matrix Composite Electrodes
A polymer component in immiscible polymer blends results in phase separation, leading to polymer morphologies that vary from isolated spherical particles to a continuous matrix phase depending on the polymer weight ratio. This work demonstrates that a polymer component with a low weight fraction can...
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Veröffentlicht in: | Advanced materials technologies 2023-09, Vol.8 (17) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A polymer component in immiscible polymer blends results in phase separation, leading to polymer morphologies that vary from isolated spherical particles to a continuous matrix phase depending on the polymer weight ratio. This work demonstrates that a polymer component with a low weight fraction can form a continuous matrix phase, rather than isolated spherical particles, which is unprecedented. Bar‐coating a solution of poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) blended with a high fraction of polydimethylsiloxane (PDMS) and a surfactant results in a continuous PEDOT:PSS matrix distributed with spherical PDMS islands. The PEDOT:PSS and PDMS in the coated layer phase separate, forming a bilayer structure owing to its different affinities to the poly(ethylene terephthalate) (PET) substrate. When cured at 100 °C, water and other volatiles in the PEDOT:PSS phase in the bottom layer evaporate, generating spaces that are subsequently filled with PDMS from the phase‐separated top layer. The continuous PEDOT:PSS matrix ensures excellent conductivity (66.17 Ω·sq
−1
), while the PDMS islands provide high stretchability. The electrical conductivity of the new electrodes varies negligibly when stretched at 50% strain and is even maintained up to 150% strain. The electrodes exhibit high transparency (≈90% at 550 nm) and electromechanical stability over 1000 cycles of 30% stretch/release tests. |
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ISSN: | 2365-709X 2365-709X |
DOI: | 10.1002/admt.202300129 |