Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-09003-5
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Funding
- National Science Foundation [CMMI-1661627]
- National Natural Science Foundation of China [51763010]
- Science Foundation for Excellent Youth Talents in Jiangxi Province [20162BCB23053]
- Key Research and Development Program of Jiangxi Province [20171BBH80007]
- China Scholarship Council [201608360062]
- Samsung Scholarship
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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 (similar to 20 S cm(-1) in PBS, similar to 40 S cm(-1) in deionized water), high stretchability (> 35% strain), low Young's modulus (similar to 2 MPa), superior mechanical, electrical and electrochemical stability, and tunable isotropic/anisotropic swelling in wet physiological environments.
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