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Electrodeposited PEDOT:Nafion Composite for Neural Recording and Stimulation
Author(s) -
Carli Stefano,
Bianchi Michele,
Zucchini Elena,
Di Lauro Michele,
Prato Mirko,
Murgia Mauro,
Fadiga Luciano,
Biscarini Fabio
Publication year - 2019
Publication title -
advanced healthcare materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.288
H-Index - 90
eISSN - 2192-2659
pISSN - 2192-2640
DOI - 10.1002/adhm.201900765
Subject(s) - pedot:pss , nafion , microelectrode , materials science , conductive polymer , polystyrene sulfonate , electrode , polymer , electrical conductor , composite number , polystyrene , nanotechnology , optoelectronics , composite material , electrochemistry , chemistry
Abstract Microelectrode arrays are used for recording and stimulation in neurosciences both in vitro and in vivo. The electrodeposition of conductive polymers, such as poly(3,4‐ethylene dioxythiophene) (PEDOT), is widely adopted to improve both the in vivo recording and the charge injection limit of metallic microelectrodes. The workhorse of conductive polymers in the neurosciences is PEDOT:PSS, where PSS represents polystyrene‐sulfonate. In this paper, the counterion is the fluorinated polymer Nafion, so the composite PEDOT:Nafion is deposited onto a flexible neural microelectrode array. PEDOT:Nafion coated electrodes exhibit comparable in vivo recording capability to the reference PEDOT:PSS, providing a large signal‐to‐noise ratio in a murine animal model. Importantly, PEDOT:Nafion exhibits a minimized polarization during electrical stimulation, thereby resulting in an improved charge injection limit equal to 4.4 mC cm −2 , almost 80% larger than the 2.5 mC cm −2 that is observed for PEDOT:PSS.