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Flexible and electrically conductive composites based on 3D hierarchical silver dendrites.

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Flexible electronics benefit from new conductive polymer composites. Silver dendrite structures in polyurethane offer superior conductivity and mechanical stability, paving the way for advanced electronic applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Conductive polymer composites are crucial for next-generation flexible electronics.
  • Improving electromechanical properties requires chemical tuning of polymers and shape engineering of fillers.
  • Polyurethane (PU)-based composites are a focus for advanced material development.

Purpose of the Study:

  • To develop highly conductive and flexible PU-based composites using 3D hierarchical silver dendrites (SDs) as fillers.
  • To investigate the impact of SD structure and polymer-filler interface on material properties.
  • To understand the conduction mechanism in these novel composites.

Main Methods:

  • Fabrication of 3D hierarchical silver dendrites (SDs).
  • Dispersion of SD fillers in PU resin using surfactants, with in-situ removal during curing.
  • Characterization of electrical resistivity, mechanical properties, and temperature-dependent resistivity.

Main Results:

  • Achieved ultralow resistivity of 7.6 × 10-5 Ω cm.
  • Demonstrated a low percolation threshold of 3 vol%.
  • Exhibited minimal resistance change under mechanical strain and strong substrate adhesion.

Conclusions:

  • 3D hierarchical SDs enhance electrical and mechanical properties of PU composites.
  • Optimized polymer-filler interface and SD structure are key to excellent performance.
  • The developed composites show significant potential for flexible electronic applications.