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Bridging the Bio-Electronic Interface with Biofabrication
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Tissue-Mimetic Supramolecular Polymer Networks for Bioelectronics.

Stephen J K O'Neill1, Zehuan Huang1, Mohammed H Ahmed2

  • 1Melville Laboratory for Polymer Synthesis, Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK.

Advanced Materials (Deerfield Beach, Fla.)
|October 31, 2022
PubMed
Summary

Researchers developed a new soft, stretchable electronic material that mimics biological tissue. This advanced material offers both electronic and ionic conductivity, enabling seamless integration with the human body for improved bioelectronic devices.

Keywords:
bioelectronicsconducting polymershost-guest chemistryhydrogelssupramolecular networks

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Area of Science:

  • Bioelectronics
  • Materials Science
  • Polymer Chemistry

Background:

  • Mechanical mismatch between rigid electronics and soft tissues hinders bioelectronic device performance.
  • Supramolecular polymer networks offer a promising alternative due to their inherent softness, wetness, and stretchability.

Purpose of the Study:

  • To introduce an electrically conductive supramolecular polymer network with tissue-mimetic properties.
  • To achieve simultaneous electronic and ionic conductivity for enhanced biointerfacing.
  • To overcome limitations of traditional rigid bioelectronic materials.

Main Methods:

  • Rational design of an ultrahigh affinity host-guest ternary complex with binding affinities >10^13 M^-2.
  • Embedding these complexes as dynamic cross-links within the polymer network.
  • In situ synthesis of a conducting polymer to create the final material.

Main Results:

  • Developed conductive supramolecular polymer networks with tissue-mimetic Young's moduli (<5 kPa) and high stretchability (>500%).
  • Achieved rapid self-recovery and high water content (>84%) in the material.
  • Fabricated intrinsically-stretchable bioelectrodes capable of monitoring electromyography signals without rigid components.

Conclusions:

  • The novel supramolecular polymer network provides an ideal electronic interface with the human body.
  • The material's properties enable advanced, flexible bioelectronic applications, such as improved electromyography monitoring.
  • This work addresses key challenges in bioelectronics by bridging the gap between synthetic materials and biological systems.