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Self-Assembly Enabled Printable Asymmetric Self-Insulated Stretchable Conductor for Human Interface.

Salahuddin Ahmed1, Marzia Momin1, Jiashu Ren1

  • 1Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA.

Advanced Materials (Deerfield Beach, Fla.)
|April 2, 2024
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Summary
This summary is machine-generated.

Researchers developed a printable liquid metal and conducting polymer composite. This material achieves high conductivity and stretchability, enabling advanced skin-interfaced electronic devices.

Keywords:
asymmetric stretchable conductorhuman interfaceself‐assemblyself‐insulatedsoft matter

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Soft and stretchable conductors are essential for advanced electronic devices, particularly for skin-interfaced and implantable applications.
  • Liquid metal conductors offer high electrical conductivity and flexibility, but challenges remain in achieving continuous conductive pathways in composites due to particle oxidation.
  • Existing materials often struggle to balance high conductivity with tissue-like mechanical properties and stretchability.

Purpose of the Study:

  • To develop a novel printable composite material for highly conductive and stretchable electronic applications.
  • To overcome the challenge of surface oxidation in liquid metal particles within polymeric matrices.
  • To create a material with tunable conductivity and mechanical properties mimicking human skin.

Main Methods:

  • A printable composite material was fabricated using liquid metal and a conducting polymer.
  • A self-assembly process was employed to create a continuous conductive pathway.
  • The material's electrical conductivity, stretchability, and mechanical modulus were characterized.
  • 3D printing was used to fabricate skin-interfaced sensors.

Main Results:

  • The composite achieved high electrical conductivity of 2089 S cm-1 on the bottom surface while maintaining an insulated top surface.
  • The material exhibited excellent stretchability exceeding 800%.
  • The elastic modulus of the composite was found to be similar to human skin tissue.
  • The material was successfully applied to fabricate 3D printed strain and electromyogram sensors.

Conclusions:

  • A novel printable composite material based on liquid metal and conducting polymer was successfully developed.
  • The material demonstrates a unique combination of high conductivity, exceptional stretchability, and tissue-like mechanical properties.
  • This self-assembled composite holds significant promise for the advancement of next-generation skin-interfaced and implantable electronic devices.