Scaling Effects on the Electrochemical Performance of poly(3,4‐ethylenedioxythiophene (PEDOT), Au, and Pt for Electrocorticography Recording,Advanced Functional Materials

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Scaling Effects on the Electrochemical Performance of poly(3,4‐ethylenedioxythiophene (PEDOT), Au, and Pt for Electrocorticography Recording
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-09-08 , DOI: 10.1002/adfm.201703018
Mehran Ganji ₁ , Ahmed T. Elthakeb ₁ , Atsunori Tanaka ₂ , Vikash Gilja _{1,

3} , Eric Halgren ₄ , Shadi A. Dayeh _{1,

2,

5}

Affiliation

Reduced contact size would permit higher resolution cortical recordings, but the effects of diameter on crucial recording and stimulation properties are poorly understood. Here, the first systematic study of scaling effects on the electrochemical properties of metallic Pt and Au and organic poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) electrodes is presented. PEDOT:PSS exhibits better faradaic charge transfer and capacitive charge coupling than metal electrodes, and these characteristics lead to improved electrochemical performance and reduced noise at smaller electrode diameters. PEDOT:PSS coating reduces the impedances of metallic electrodes by up to 18x for diameters <200 µm, but has no effect for millimeter scale contacts due to the dominance of series resistances. Therefore, the performance gains are especially significant at smaller diameters and lower frequencies essential for recording cognitive and pathological activities. Additionally, the overall reduced noise of the PEDOT:PSS electrodes enables a lower noise floor for recording action potentials. These results permit quantitative optimization of contact material and diameter for different electrocorticography applications.

中文翻译：

缩放对聚（3,4-乙撑二氧噻吩（PEDOT），Au和Pt的电化学性能的皮质电记录的缩放作用

减小的接触尺寸将允许更高分辨率的皮质记录，但是人们对直径对关键记录和刺激特性的影响知之甚少。在这里，对金属Pt和Au以及有机聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）电极的电化学性能的结垢效应进行了首次系统研究。PEDOT：PSS表现出比金属电极更好的法拉第电荷转移和电容性电荷耦合，这些特性导致在较小的电极直径下改善了电化学性能并降低了噪音。PEDOT：PSS涂层对于直径<200 µm的金属电极的阻抗降低了18倍，但由于串联电阻的优势，对毫米级触点没有影响。所以，在记录认知和病理活动必不可少的较小直径和较低频率下，性能提升尤为重要。此外，PEDOT：PSS电极的总体噪音降低，可降低本底噪声，从而记录动作电位。这些结果允许针对不同的皮层照相术应用对接触材料和直径进行定量优化。

更新日期：2017-09-08

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