A Peano-Gosper Fractal-Inspired Stretchable Electrode with Integrated Three-Directional Strain and Normal Pressure...

Area of Science:

• Materials Science
• Nanotechnology
• Wearable Technology

Background:

• Developing multifunctional sensors for complex mechanical monitoring is crucial.
• Existing stretchable sensors often struggle with isotropic strain detection and durability.

Purpose of the Study:

• To create a novel stretchable electrode for simultaneous detection of three-directional strain and normal pressure.
• To leverage fractal geometry and liquid metal for enhanced sensor performance.

Main Methods:

• Fabrication of a stretchable electrode using liquid metal (EGaIn) microchannels within a PDMS matrix.
• Utilizing a Peano-Gosper fractal design for uniform strain distribution.
• Characterization of electromechanical properties under varying strain (0-60%) and pressure (0-20 kPa).

Main Results:

• The electrode achieved consistent three-directional strain sensing with low resistance variation (<4%) and gauge factor deviation (0.0252).
• Demonstrated low hysteresis (0.94%), good durability, and electromechanical stability.
• Provided a linear response for pressure sensing (R² ≈ 0.99) with moderate sensitivity (0.198 kPa⁻¹).

Conclusions:

• The integrated fractal-liquid metal electrode enables reliable multidimensional mechanical monitoring.
• This design shows significant potential for applications in soft robotics, human-machine interaction, and advanced wearable electronics.