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Electrical percolation in extrinsically conducting, poly(ε-decalactone) composite neural interface materials.

Katarzyna Krukiewicz1,2, James Britton3, Daria Więcławska4

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Summary

Soft, conductive composites using carbon nanotubes, silver nanowires, or microspheres improve neural interface functionality. These materials offer better biocompatibility and electrochemical properties for diagnosing and treating neurological disorders.

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Area of Science:

  • Biomaterials Science
  • Neurotechnology
  • Polymer Chemistry

Background:

  • Neural interfaces require soft, conductive materials to bridge the mechanical gap between electronics and delicate neural tissue.
  • Chronic device functionality is often limited by the mechanical mismatch between traditional metallic electrodes and neural tissue.
  • Developing advanced materials is crucial for the future diagnosis and treatment of neurological disorders.

Purpose of the Study:

  • To develop and investigate soft, electrically conductive composites for enhanced neural interface applications.
  • To evaluate the effect of different conducting fillers (carbon nanotubes, silver nanowires, poly(hydroxymethyl 3,4-ethylenedioxythiophene) microspheres) on composite properties.
  • To assess the in vitro biocompatibility and electrochemical performance of these novel composites.

Main Methods:

  • Fabrication of poly(ε-decalactone) (EDL) based composites incorporating carbon nanotubes (CNT), silver nanowires (AgNW), or microspheres (MSP) as conducting fillers.
  • Investigation of electrical percolation threshold and electrochemical characteristics, including film resistance, charge storage capacity, and interphase capacitance.
  • In vitro biocompatibility assessment by evaluating the reduction of reactive astrocytes on composite surfaces compared to control electrodes.

Main Results:

  • EDL/CNT composites demonstrated the lowest film resistance (1.2 ± 0.3 kΩ).
  • EDL/AgNW composites exhibited the highest charge storage capacity (10.7 ± 0.3 mC cm⁻²).
  • EDL/MSP composites showed the highest interphase capacitance (1478.4 ± 92.4 µF cm⁻²).
  • All tested composite surfaces were biocompatible and reduced reactive astrocyte presence compared to controls.

Conclusions:

  • High aspect ratio fillers effectively form percolation networks within a polyester matrix, yielding composites with desirable properties.
  • The developed soft, conductive composites offer significant advantages in mechanical, electrochemical, and biocompatibility aspects for neural interfaces.
  • These findings pave the way for improved neural interface designs for neurological disorder diagnosis and treatment.