Electrospun Conductive Composites with Anisotropic Microstructures and Tunable Mechanical Properties for Wearable...

Area of Science:

• Materials Science
• Wearable Electronics
• Biomedical Engineering

Background:

• Flexible materials for wearable electronics face challenges in balancing electrical stability with mechanical tunability.
• Existing materials often compromise one property for the other, limiting their application scope.

Purpose of the Study:

• To develop a composite conductive material that offers both stable electrical conductivity and tunable mechanical properties.
• To demonstrate the material's utility in flexible dry electrodes for physiological signal acquisition.

Main Methods:

• Fabrication of a composite material using electrospun fiber networks with controlled orientation and an ion-gel phase.
• Structural regulation to achieve tunable mechanical properties, ranging from isotropic to anisotropic.
• Processing the composite membrane into flexible dry electrodes for physiological monitoring.

Main Results:

• Achieved designed adjustment of mechanical properties (Young's modulus) by controlling fiber orientation.
• Maintained stable electrical conductivity across different mechanical states.
• Demonstrated high signal-to-noise ratio and stable waveforms for electrocardiogram (ECG) signal acquisition.
• Successfully monitored electromyographic (EMG) signals during various static and dynamic hand gestures.

Conclusions:

• The developed composite material successfully integrates electrical stability and mechanical tunability for advanced wearable electronics.
• The material shows significant potential for multifunctional applications, particularly in physiological monitoring devices.
• This work offers a promising strategy for designing next-generation flexible electronic materials and devices.