Phase-separated porous nanocomposite with ultralow percolation threshold for wireless bioelectronics

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Stretchable conductive composites are crucial for advanced applications like wearables and biomedical implants.
• Current materials often fail under strain due to disrupted conductive pathways and high filler content.

Purpose of the Study:

• To develop intrinsically soft, highly conductive, and strain-resilient conductive elastic composites.
• To overcome the limitations of existing materials in terms of electrical durability and performance under strain.

Main Methods:

• An in situ phase-separation method was employed for microscale silver nanowire assembly.
• Self-organized percolation networks were created on pore surfaces within multiscale porous polymer matrices.

Main Results:

• The resulting nanocomposites exhibit high conductivity, strain insensitivity, and fatigue tolerance with minimal filler.
• Porous microstructures significantly reduced the percolation threshold (Vc = 0.00062) by 48-fold.
• Electrical performance remained stable even under strains exceeding 600%.

Conclusions:

• The developed strategy offers a novel approach for creating advanced stretchable conductive materials.
• These materials enable robust, battery-free wireless power and data transmission for bioelectronics.
• The findings provide versatile material solutions for diverse stretchable electronic applications.