Highly Sensitive and Stretchable c-MWCNTs/PPy Embedded Multidirectional Strain Sensor Based on Double Elastic Fabric...

Area of Science:

• Materials Science
• Nanotechnology
• Wearable Technology

Background:

• Traditional uniaxial strain sensors struggle with the multi-dimensional complexity of human motion.
• There is a critical need for multidirectional strain sensors with superior electromechanical performance for dynamic motion monitoring.

Purpose of the Study:

• To develop a stretchable biaxial strain sensor capable of accurately detecting dynamic, multidirectional human body motions.
• To investigate the electromechanical properties and potential applications of the novel sensor in wearable devices and healthcare.

Main Methods:

• Fabrication of a double elastic fabric (DEF) based biaxial strain sensor.
• Incorporation of carboxylic multi-walled carbon nanotubes (c-MWCNTs) and polypyrrole (PPy) using scalable soaking and adsorption-oxidizing methods.
• Characterization of the sensor's anisotropic strain sensing performance, stretchability, response time, stability, and durability.

Main Results:

• The DEF/c-MWCNTs/PPy strain sensor demonstrated high anisotropic strain sensing performance.
• Achieved a maximum gauge factor (GF) of 5.2, stretchability exceeding 80%, and a response time under 100 ms.
• Exhibited favorable electromechanical stability and durability over 800 stretching-releasing cycles.
• Successfully applied in detecting subtle and large-scale human motions, including complex synovial joint movements (neck, shoulder).

Conclusions:

• The developed DEF/c-MWCNTs/PPy strain sensor offers a promising solution for accurate multidirectional motion monitoring.
• Its excellent performance and versatility suggest significant potential for integration into wearable electronics and personal healthcare monitoring systems.
• This work highlights the capability of fabric-based sensors in capturing complex human body dynamics.