Flexible Sensor with Material-Microstructure Synergistic Optimization for Wearable Physiological Monitoring

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Flexible sensors are crucial for wearable electronics, smart healthcare, and soft robotics.
• Existing sensors face challenges like sensitivity trade-offs and poor signal stability under deformation.

Purpose of the Study:

• To develop a high-performance flexible sensor that overcomes current limitations.
• To enhance sensitivity, operational bandwidth, and signal stability.

Main Methods:

• A dual-layered electrode system using silver nanoparticles (AgNPs) and a composite of multi-walled carbon nanotubes (MWCNTs) with carbon black (CB).
• Incorporation of a laser-engraved crack-gradient microstructure to control strain response.

Main Results:

• Achieved high sensitivity (1.56 kPa^-1) and broad operational bandwidth (50-600 Hz).
• Demonstrated rapid signal response, fine frequency resolution (0.5 Hz), and improved signal repeatability and durability.
• Enhanced noise immunity and stability under cyclic deformation.

Conclusions:

• The developed soft sensor offers a promising solution for reliable, multifunctional sensing.
• The sensor shows strong applicability in health monitoring, motion tracking, and intelligent interfaces.
• This structural strategy advances the field of flexible sensor technology.