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Conductive elastomer composites for fully polymeric, flexible bioelectronics.

Estelle Cuttaz1, Josef Goding, Catalina Vallejo-Giraldo

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Researchers developed flexible, stretchable conductive elastomers (CEs) for neuroprosthetics. These organic electrode arrays, made from polyurethane elastomers and PEDOT:PSS, show promising conductivity and biocompatibility for neural applications.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Polymer Science

Background:

  • Metallic electrode arrays in neuroprosthetics face limitations due to mechanical mismatch with biological tissues.
  • Flexible polymeric bioelectronics offer a potential solution by improving device-tissue integration.

Purpose of the Study:

  • To fabricate and characterize fully organic, flexible, and stretchable electrode arrays using conductive elastomers (CEs) for neuroprosthetic applications.
  • To investigate the relationship between conductive polymer loading and the mechanical and electrical properties of the CE composites.
  • To assess the biocompatibility and neural cell interaction of the developed CE materials.

Main Methods:

  • Fabrication of conductive elastomers (CEs) by solvent casting hybrids of polyurethane elastomers (PU) and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) at varying loadings (5-25 wt%).
  • Characterization of CE composite properties, including conductivity, charge storage capacity, Young's modulus, and strain at failure.
  • Biological assessment using ReNcell VM human neural precursor cells to evaluate cell adhesion and neurite outgrowth.
  • Laser micromachining of CE sheets into functional electrode arrays and in vitro testing of waveform delivery compared to platinum (Pt) arrays.

Main Results:

  • Increased poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) loading resulted in a more connected conductive network within the polyurethane (PU) matrix, enhancing conductivity and charge storage capacity.
  • Higher conductive polymer loading increased the Young's modulus and decreased the strain at failure of the conductive elastomers.
  • CE composites demonstrated successful mediation of human neural precursor cell adhesion, with increased stiffness promoting neurite outgrowth.
  • Laser-micromachined CE arrays delivered biphasic waveforms with voltage transients comparable to platinum arrays in in vitro tests.

Conclusions:

  • Straightforward fabrication of fully organic, flexible, and stretchable conductive elastomer electrode arrays is achievable.
  • The mechanical and electrical properties of conductive elastomers can be tuned by adjusting conductive polymer loading.
  • These organic electrode arrays show potential for improved neuroprosthetic applications due to their biocompatibility and performance characteristics.