AgOCN Piezoresistive Sensor for Human Motion Signal Detection Based on Electrospinning Method

Area of Science:

• Materials Science
• Biomedical Engineering
• Sensor Technology

Background:

• Flexible sensors are crucial for wearable electronics and medical monitoring but often suffer from poor mechanical properties and slow response times.
• Existing devices face limitations in size, responsiveness, and durability, hindering widespread medical adoption.
• There is a need for advanced flexible sensors with superior performance for real-time human body signal monitoring.

Purpose of the Study:

• To develop novel, lightweight, and flexible piezoresistive sensors with enhanced performance characteristics.
• To investigate the use of electrostatic spinning and composite materials for sensor fabrication.
• To create integrated sensing devices for monitoring human motion and physiological signals.

Main Methods:

• Utilized electrostatic spinning technology for composite spinning of polyacrylonitrile, N,N-dimethylformamide, and AgCl/AgOCN.
• Constructed piezoresistive sensors with a gradient pore structure and employed a sandwich packaging process.
• Integrated sensors with a coin cell, AD acquisition module, and 4G communication module on an STM32 microcontroller.

Main Results:

• Optimized sensor performance by doping with Ag+ ions, achieving a wide detection range up to 300 kPa.
• Demonstrated significantly improved sensor performance with response and recovery times of 110 ms and 340 ms, respectively.
• Successfully applied the sensors to monitor basic human movements like finger flexion, phonation, breathing, and gait analysis.

Conclusions:

• The developed AgOCN piezoresistive sensors exhibit excellent mechanical properties and high sensitivity for detecting human motion.
• The lightweight and flexible sensing devices show great potential for applications in medical treatment and human body signal monitoring.
• This work presents a promising approach for creating next-generation wearable sensing technologies.