Stretchable and Self-Healable Graphene-Polymer Conductive Composite for Wearable EMG Sensor

Area of Science:

• Bioelectronics
• Materials Science
• Polymer Science

Background:

• Stretchable and self-healable electrodes are crucial for reliable bioelectronic sensors due to their tissue compatibility and durability.
• Polymer-graphene composites offer advantages for bioelectronic sensor electrodes.
• Previous self-healing composites required external stimuli (heat, light) for repair.

Purpose of the Study:

• To optimize a conducting composite material for bioelectronic sensors.
• To develop a self-healing composite that does not require external stimuli for repair.
• To assess the durability and electrical recovery of the optimized composite after mechanical damage.

Main Methods:

• Optimization of a conducting composite by mixing a self-healing polymer (SHP) and graphene.
• Evaluation of self-healing capabilities without external stimulation.
• Testing of electrical recovery after repeated mechanical damage (scratches).
• Assessment of electrical endurance through cyclic testing (200 cycles at 50% strain).
• Measurement of electromyogram (EMG) signals from arm muscle movements.
• Integration with a microcontroller for robot hand control.

Main Results:

• The optimized polymer-graphene composite exhibits self-healing properties without external stimuli.
• The material demonstrates rapid electrical recovery from mechanical damage.
• Stable electrical endurance was confirmed over 200 cycles at 50% strain.
• Successful measurement of EMG signals for controlling a robot hand.

Conclusions:

• The developed self-healing polymer-graphene composite is a promising material for durable bioelectronic sensor devices.
• The material's ability to self-heal and maintain electrical integrity enhances its utility in wearable electronics.
• This advancement facilitates reliable physiological monitoring and advanced human-machine interfaces.