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Porous Elastomer Film with Controlled Liquid-Metal Distribution for Recyclable Highly Customizable and Stretchable

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New stretchable conductors use liquid-metal (LM) within porous polyurethane films. This design prevents short-circuiting under strain, enabling advanced flexible electronics with tunable patterns for EMI shielding and wireless communication.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Science

Background:

  • Stretchable conductors are vital for flexible electronics, requiring high conductivity and stability during deformation.
  • Existing liquid-metal (LM)-based composites face challenges like short-circuiting due to unintended activation under strain.
  • Developing customizable and reliable LM-based stretchable conductors remains a significant challenge.

Purpose of the Study:

  • To design and fabricate novel stretchable LM/thermoplastic polyurethane (TPU) porous films with controlled LM distribution.
  • To overcome the limitations of conventional LM composites by preventing short-circuiting and enabling customizable conductive patterns.
  • To explore the potential of these films in various flexible electronic applications.

Main Methods:

  • Utilizing non-solvent-induced phase separation and surface modification of LM particles for controlled LM distribution.
  • Creating a porous structure to increase spacing between LM particles and alleviate stress.
  • Employing imprinting techniques for customizable conductive patterning.

Main Results:

  • The developed porous films exhibit controlled LM distribution and prevent short-circuiting during stretching due to increased particle spacing.
  • Customizable patterning via imprinting allows for applications in electromagnetic interference (EMI) shielding with dynamically tunable performance.
  • The materials demonstrate excellent performance in wireless communications, tunable EM wave filters, and stretchable Joule heaters.
  • Thermoplastic polyurethane (TPU) enables efficient recycling of LM from the films, showcasing high recyclability.

Conclusions:

  • The novel stretchable LM/TPU porous films offer a promising solution for advanced flexible electronics.
  • The controlled LM distribution, porous structure, and customizable patterning address key challenges in stretchable conductor technology.
  • These films exhibit versatile applications and excellent recyclability, indicating a significant impact on the future of stretchable electronics.