Hierarchical structures on platinum-iridium substrates enhancing conducting polymer adhesion  

作　　者：Linze Li Changqing Jiang Luming Li 

机构地区：[1]School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou 350108,China [2]National Engineering Research Center of Neuromodulation,School of Aerospace Engineering,Tsinghua University,Beijing 100084,China [3]IDG/McGovern Institute for Brain Research at Tsinghua University,Beijing 100084,China

出　　处：《Bio-Design and Manufacturing》2024年第6期889-898,共10页生物设计与制造（英文）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFC2400201);the National Natural Science Foundation of China(No.81830033);the Natural Science Foundation of Fujian Province,China(No.2023J05097);the Young and Middle-aged Teacher Education Research Project of the Education Department of Fujian Province,China(No.JAT220004)。

摘　　要：Conducting polymers(CPs),including poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS),are promising coating materials for neural electrodes.However,the weak adhesion of CP coatings to substrates such as platinum-iridium is a significant challenge that limits their practical application.To address this issue,we used femtosecond laser-prepared hierarchical structures on platinum-iridium(Pt-Ir)substrates to enhance the adhesion of PEDOT:PSS coatings.Next,we used cyclic voltammetry(CV)stress and accelerated aging tests to evaluate the stability of both drop cast and electrodeposited PEDOT:PSS coatings on Pt-Ir substrates,both with and without hierarchical structures.Our results showed that after 2000 CV cycles or five weeks of aging at 60℃,the morphology and electrochemical properties of the coatings on the Pt-Ir substrates with hierarchical structures remained relatively stable.In contrast,we found that smooth Pt-Ir substrate surfaces caused delamination of the PEDOT:PSS coating and exhibited both decreased charge storage capacity and increased impedance.Overall,enhancing the stability of PEDOT:PSS coatings used on common platinum-iridium neural electrodes offers great potential for improving their electrochemical performance and developing new functionalities.

关 键 词：Hierarchical structures Femtosecond laser Conducting polymers Neural electrodes Stability 

分 类 号：R318.08[医药卫生—生物医学工程]