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学者姓名：李霖泽
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Abstract ：
Implantable electrodes are crucial for stimulation safety and recording quality of neuronal activity. To enhance their electrochemical performance, electrodeposited nanostructured platinum (nanoPt) and iridium oxide (IrOx) have been proposed due to their advantages of in situ deposition and ease of processing. However, their unstable adhesion has been a challenge in practical applications. This study investigated the electrochemical performance and stability of nanoPt and IrOx coatings on hierarchical platinum-iridium (Pt-Ir) substrates prepared by femtosecond laser, compared with the coatings on smooth Pt-Ir substrates. Ultrasonic testing, agarose gel testing, and cyclic voltammetry (CV) testing were used to evaluate the coatings' stability. Results showed that the hierarchical Pt-Ir substrate significantly enhanced the charge-storage capacity of electrodes with both coatings to more than 330 mC/cm2, which was over 75 times that of the smooth Pt-Ir electrode. The hierarchical substrate could also reduce the cracking of nanoPt coatings after ultrasonic, agarose gel and CV testing. Although some shedding was observed in the IrOx coating on the hierarchical substrate after one hour of sonication, it showed good stability in the agarose gel and CV tests. Stable nanoPt and IrOx coatings may not only improve the electrochemical performance but also benefit the function of neurobiochemical detection.
Keyword ：
coating stability coating stability femtosecond laser femtosecond laser hierarchical structures hierarchical structures iridium oxide iridium oxide neural electrodes neural electrodes platinum platinum
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| GB/T 7714 | Li, Linze , Jiang, Changqing , Li, Luming . A Comparative Study on the Effect of Substrate Structure on Electrochemical Performance and Stability of Electrodeposited Platinum and Iridium Oxide Coatings for Neural Electrodes [J]. | MICROMACHINES , 2024 , 15 (1) . |
| MLA | Li, Linze 等. "A Comparative Study on the Effect of Substrate Structure on Electrochemical Performance and Stability of Electrodeposited Platinum and Iridium Oxide Coatings for Neural Electrodes" . | MICROMACHINES 15 . 1 (2024) . |
| APA | Li, Linze , Jiang, Changqing , Li, Luming . A Comparative Study on the Effect of Substrate Structure on Electrochemical Performance and Stability of Electrodeposited Platinum and Iridium Oxide Coatings for Neural Electrodes . | MICROMACHINES , 2024 , 15 (1) . |
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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 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 °C, 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. Graphic abstract: (Figure presented.). © Zhejiang University Press 2024.
Keyword ：
Conducting polymers Conducting polymers Femtosecond laser Femtosecond laser Hierarchical structures Hierarchical structures Neural electrodes Neural electrodes Stability Stability
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| GB/T 7714 | Li, L. , Jiang, C. . Hierarchical structures on platinum–iridium substrates enhancing conducting polymer adhesion [J]. | Bio-Design and Manufacturing , 2024 , 7 (6) : 889-898 . |
| MLA | Li, L. 等. "Hierarchical structures on platinum–iridium substrates enhancing conducting polymer adhesion" . | Bio-Design and Manufacturing 7 . 6 (2024) : 889-898 . |
| APA | Li, L. , Jiang, C. . Hierarchical structures on platinum–iridium substrates enhancing conducting polymer adhesion . | Bio-Design and Manufacturing , 2024 , 7 (6) , 889-898 . |
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Abstract ：
Poly(3,4-ethylenedioxythiophene) (PEDOT) has emerged as a promising coating for neural electrodes especially through convenient electrodeposition methods. To investigate the influences of solvents and EDOT monomer concentrations on the electrochemical performance and structural characteristics of PEDOT, both aqueous and acetonitrile solutions were employed with varying monomer concentrations during deposition. The prepared PEDOT films were examined for the surface morphology, electrochemical performance, and chemical structures. The results showed that an increase in EDOT concentration in either solvent led to PEDOT films with improved charge storage capacity and reduced impedance magnitude. At equivalent monomer concentrations, PEDOT films generated in acetonitrile exhibited a rougher surface texture and better electrochemical performance. Notably, the growth rate of charge storage capacity of PEDOT prepared in acetonitrile relative to the deposited charge density was 2.5 times that of PEDOT prepared in water. These findings could help to the optimization of PEDOT coating preparation to enhance electrode performance. © 2024 The Royal Society of Chemistry.
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| GB/T 7714 | Zhang, Yang , Li, Linze , He, Bingwei . Influences of solvents and monomer concentrations on the electrochemical performance and structural properties of electrodeposited PEDOT films: a comparative study in water and acetonitrile [J]. | RSC Advances , 2024 , 14 (41) : 30045-30054 . |
| MLA | Zhang, Yang 等. "Influences of solvents and monomer concentrations on the electrochemical performance and structural properties of electrodeposited PEDOT films: a comparative study in water and acetonitrile" . | RSC Advances 14 . 41 (2024) : 30045-30054 . |
| APA | Zhang, Yang , Li, Linze , He, Bingwei . Influences of solvents and monomer concentrations on the electrochemical performance and structural properties of electrodeposited PEDOT films: a comparative study in water and acetonitrile . | RSC Advances , 2024 , 14 (41) , 30045-30054 . |
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Abstract ：
Neural electrode interfaces are essential to the stimulation safety and recording quality of various bioelectronic therapies. The recently proposed hierarchical platinum-iridium (Pt-Ir) electrodes produced by femtosecond lasers have exhibited superior electrochemical performance in vitro, but their in vivo performance is still unclear. In this study, we explored the electrochemical performance, biological response, and tissue adhesion of hierarchical Pt-Ir electrodes by implantation in adult rat brains for 1, 8, and 16 weeks. Regular smooth Pt-Ir electrodes were used as a control. The results showed that the electrochemical performance of both electrodes decreased and leveled off during implantation. However, after 16 weeks, the charge storage capacity of hierarchical electrodes stabilized at similar to 16.8 mC/cm(2), which was 15 times that of the smooth control electrodes (1.1 mC/cm(2)). Moreover, the highly structured electrodes had lower impedance amplitude and cutoff frequency values. The similar histological response to smooth electrodes indicated good biocompatibility of the hierarchically structured Pt-Ir electrodes. Given their superior in vivo performance, the femtosecond laser-treated Pt-Ir electrode showed great potential for neuromodulation applications.
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| GB/T 7714 | Li, Linze , Jiang, Changqing , Duan, Wanru et al. Electrochemical and biological performance of hierarchical platinum-iridium electrodes structured by a femtosecond laser [J]. | MICROSYSTEMS & NANOENGINEERING , 2022 , 8 (1) . |
| MLA | Li, Linze et al. "Electrochemical and biological performance of hierarchical platinum-iridium electrodes structured by a femtosecond laser" . | MICROSYSTEMS & NANOENGINEERING 8 . 1 (2022) . |
| APA | Li, Linze , Jiang, Changqing , Duan, Wanru , Wang, Zhiyan , Zhang, Feng , He, Changgeng et al. Electrochemical and biological performance of hierarchical platinum-iridium electrodes structured by a femtosecond laser . | MICROSYSTEMS & NANOENGINEERING , 2022 , 8 (1) . |
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