Stretchable Conductive Ink Based on Polysiloxane-Silver Composite and Its Application as a Frequency Reconfigurable...

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Advancements in portable electronics necessitate flexible and stretchable conductive materials.
• Existing materials often lack the durability required for dynamic applications.

Purpose of the Study:

• To fabricate and characterize a stretchable microstrip patch antenna for wearable devices.
• To investigate the conductivity mechanisms and performance of the antenna under strain.

Main Methods:

• Fabrication of a microstrip patch antenna using silver ink polysiloxane composite on a stretchable polysiloxane substrate.
• Characterization of antenna performance at varying conductive filler loadings (35, 45, 60 vol %) and strain amplitudes (10-20%).
• Analysis of conductivity using the variable range hopping model.

Main Results:

• The antenna demonstrated consistent conductivity (10-70 S/cm) within the 10-20% strain range due to optimized filler loading and adhesion.
• Resonant frequency decreased with increasing strain, while radiation loss (S11) and bandwidth correlated positively with conductivity.
• The study verified conductivity mechanisms involving hopping and tunneling, influenced by percolation threshold dynamics.

Conclusions:

• The fabricated silver ink polysiloxane antenna is feasible for ultrahigh-frequency (UHF) band applications.
• The material's stretchability and stable conductivity under strain make it suitable for advanced wearable electronics.
• Understanding percolation threshold phenomena is key to designing robust stretchable conductive materials.