Pure PEDOT:PSS hydrogels

Baoyang Lu, Hyunwoo Yuk, Shaoting Lin, Nannan Jian, Kai Qu, Jingkun Xu and Xuanhe Zhao ()
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Baoyang Lu: Jiangxi Science and Technology Normal University
Hyunwoo Yuk: Massachusetts Institute of Technology
Shaoting Lin: Massachusetts Institute of Technology
Nannan Jian: Jiangxi Science and Technology Normal University
Kai Qu: Jiangxi Science and Technology Normal University
Jingkun Xu: Jiangxi Science and Technology Normal University
Xuanhe Zhao: Massachusetts Institute of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Hydrogels of conducting polymers, particularly poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), provide a promising electrical interface with biological tissues for sensing and stimulation, owing to their favorable electrical and mechanical properties. While existing methods mostly blend PEDOT:PSS with other compositions such as non-conductive polymers, the blending can compromise resultant hydrogels’ mechanical and/or electrical properties. Here, we show that designing interconnected networks of PEDOT:PSS nanofibrils via a simple method can yield high-performance pure PEDOT:PSS hydrogels. The method involves mixing volatile additive dimethyl sulfoxide (DMSO) into aqueous PEDOT:PSS solutions followed by controlled dry-annealing and rehydration. The resultant hydrogels exhibit a set of properties highly desirable for bioelectronic applications, including high electrical conductivity (~20 S cm−1 in PBS, ~40 S cm−1 in deionized water), high stretchability (> 35% strain), low Young’s modulus (~2 MPa), superior mechanical, electrical and electrochemical stability, and tunable isotropic/anisotropic swelling in wet physiological environments.

Date: 2019
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DOI: 10.1038/s41467-019-09003-5

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