佩多:嘘
Nafion公司
微电极
材料科学
聚苯乙烯磺酸盐
导电聚合物
聚合物
电极
复合数
导电体
聚苯乙烯
纳米技术
光电子学
电化学
复合材料
化学
物理化学
作者
Stefano Carli,Michele Bianchi,Elena Zucchini,Michele Di Lauro,Mirko Prato,Mauro Murgia,Luciano Fadiga,Fabio Biscarini
标识
DOI:10.1002/adhm.201900765
摘要
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.
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