Stretchable Strain Sensor with Small but Sufficient Adhesion to Skin

Area of Science:

• Materials Science
• Biomedical Engineering
• Wearable Technology

Background:

• Development of advanced materials for wearable electronics is crucial for non-invasive health monitoring.
• Existing strain sensors often lack the necessary stretchability and biocompatibility for continuous human motion tracking.

Purpose of the Study:

• To demonstrate novel stretchable strain sensors utilizing liquid metal and silicone rubber.
• To evaluate the mechanical and electrical properties of these sensors for human motion monitoring applications.

Main Methods:

• Fabrication of stretchable strain sensors using eutectic gallium-indium (E-GaIn) liquid metal and Ecoflex silicone rubber.
• Experimental evaluation of sensor's mechanical properties, including stretchability up to 100%.
• Assessment of adhesion force to skin and performance in monitoring physiological movements.

Main Results:

• The E-GaIn and Ecoflex-based sensors exhibit excellent stretchability (100%) and sufficient skin adhesion for practical use.
• The sensors accurately captured various human motions, including joint movements, facial expressions, and respiration.
• Mechanical and electrical properties were characterized, confirming sensor reliability.

Conclusions:

• The developed stretchable strain sensors offer a promising solution for non-invasive human motion monitoring.
• The combination of E-GaIn and Ecoflex provides a flexible, deformable, and adhesive platform for wearable sensing.
• This technology has potential applications in healthcare, sports, and human-computer interaction.