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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.

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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.

Keywords:
PEDOT:PSSSEIbioelectronicshierarchical structureneural interfacestructure–property correlation

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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.