Mechanically Stable Kirigami Deformable Resonant Circuits for Wireless Vibration and Pressure Sensor Applications

Area of Science:

• Materials Science
• Electronics Engineering
• Mechanical Engineering

Background:

• Deformable 3D structures are crucial for advanced flexible electronics.
• Traditional inductor coils lack mechanical stability in flexible devices.
• Kirigami offers a promising approach for stable, deformable structures.

Purpose of the Study:

• To create a stable, out-of-plane deformable kirigami structure for wireless sensing.
• To integrate kirigami designs with functional materials for enhanced electronic devices.
• To demonstrate a wirelessly operated sensor for mechanical vibration and pressure.

Main Methods:

• Fabrication of a polymer kirigami-based structure with concentric circles and hinges.
• Integration of the kirigami structure with functional materials to form inductor coils.
• Wireless sensing experiments to measure resonant frequency shifts, acceleration, and pressure.
• Mechanical testing to evaluate cycling stability and hysteresis.

Main Results:

• The kirigami-supported inductor coils demonstrated exceptional mechanical stability.
• A linear response (Adj. R² = 0.99) was observed between resonant frequency shift and extension.
• The sensor exhibited excellent cycling stability and minimal hysteresis over 5 days.
• A high-linearity acceleration sensor (0-20 ms⁻²) and a sensitive low-pressure sensor were successfully demonstrated wirelessly.

Conclusions:

• The developed kirigami sensor enables stable, wireless monitoring of mechanical vibration and pressure.
• This technology is suitable for battery-free deformable electronics in motion tracking, health monitoring, and soft robotics.
• The study highlights the potential of kirigami structures in advancing flexible and wearable sensing technologies.