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Bio-Design and Manufacturing  2024 Vol.7 No.6 P.889-898

http://doi.org/10.1007/s42242-024-00296-0


Hierarchical structures on platinumiridium substrates enhancing conducting polymer adhesion


Author(s):  Linze Li, Changqing Jiang & Luming Li

Affiliation(s):  School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China; more

Corresponding email(s):   lzli@fzu.edu.cn, jiangcq13@tsinghua.edu.cn

Key Words:  Hierarchical structures Femtosecond laser Conducting polymers Neural electrodes Stability


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Linze Li, Changqing Jiang & Luming Li . Hierarchical structures on platinumiridium substrates enhancing conducting polymer adhesion[J]. Journal of Zhejiang University Science D, 2024, 7(6): 889-898.

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author="Linze Li, Changqing Jiang & Luming Li ",
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Abstract: 
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 platinumiridium is a significant challenge that limits their practical application. To address this issue, we used femtosecond laser-prepared hierarchical structures on platinumiridium (PtIr) 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 PtIr substrates, both with and without hierarchical structures. Our results showed that after 2000 CV cycles or five weeks of aging at 60 C, the morphology and electrochemical properties of the coatings on the PtIr substrates with hierarchical structures remained relatively stable. In contrast, we found that smooth PtIr 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 platinumiridium neural electrodes offers great potential for improving their electrochemical performance and developing new functionalities.

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