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PEDOT:PSS as a Bio-Solid Electrolyte Interphase for Neural Interfaces: From Molecular Design to Interfacial
Zhen Liu1, Jia Liu1, Peng Zhang2
1Medical Devices Research and Testing Center, South China University of Technology, Guangzhou 510006, China.
Polymers
|January 10, 2026
Summary
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) acts as a bio-solid electrolyte interphase (bio-SEI), enhancing neural probe interactions. This material improves implant stability and biocompatibility for advanced neural interfaces.
Area of Science:
- Neural Engineering
- Materials Science
- Biomedical Engineering
Background:
- Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a key material in neural engineering due to its conductivity, softness, and processability.
- Emerging research highlights PEDOT:PSS as a bio-solid electrolyte interphase (bio-SEI) crucial for neural probe-tissue interactions.
Purpose of the Study:
- To review advancements in PEDOT:PSS molecular design, synthesis, and post-treatment for improved stability and biocompatibility.
- To explore PEDOT:PSS's role as an adaptive bio-SEI that mediates transport and buffers mechanical/chemical stress at the device-tissue interface.
- To discuss how PEDOT:PSS's hierarchical structure impacts long-term electrochemical and biological stability.
Main Methods:
- Critical review of literature on PEDOT:PSS modifications (e.g., polydopamine adhesion, zwitterionic modification, hydrogel hybridization).
- Analysis of strategies to enhance PEDOT:PSS stability and compatibility in physiological environments.
- Examination of the relationship between PEDOT:PSS structure (molecular to morphological) and its function as a bio-SEI.
Main Results:
- PEDOT:PSS modifications enhance its stability and compatibility, transforming it into an active, self-regulating interphase.
- The bio-SEI function of PEDOT:PSS is critical for mediating ion/electron transport and mitigating degradation at the neural probe-tissue boundary.
- Hierarchical structure of PEDOT:PSS significantly contributes to its long-term electrochemical and biological performance.
Conclusions:
- PEDOT:PSS should be viewed as an intrinsic bio-SEI, not merely a conductive coating, for optimizing neural interface performance.
- Advanced PEDOT:PSS strategies are essential for developing durable, biocompatible, and intelligent neural interfaces.
- Understanding PEDOT:PSS's bio-SEI properties is key to next-generation implantable electronics.
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