Degradable Multilayer Fabric Sensor with Wide Detection Range and High Linearity.

Area of Science:

• Materials Science
• Nanotechnology
• Wearable Electronics

Background:

• Flexible pressure sensors offer enhanced versatility but often contribute to e-waste.
• Integrating degradability with wide-range linearity in a single device is crucial for sustainable electronics.

Purpose of the Study:

• To develop a degradable multilayer fabric (DMF) pressure sensor with combined wide-range linearity and environmental degradability.
• To explore the potential of DMFs for on-demand wearable electronic applications.

Main Methods:

• Fabrication of a DMF using ellipsoidal carbon nanotube (ECNT) and polyvinylpyrrolidone/cellulose acetate electrospun fibers (PEF) via layer-by-layer stacking.
• Characterization of pressure sensitivity, mechanical stability, and degradation performance using FTIR and decomposition experiments.
• Evaluation of sensor performance in detecting various physiological signals and movements.

Main Results:

• The optimized DMF sensor exhibited high sensitivity (3.38 kPa⁻¹) across a wide pressure range (0.1–500 kPa).
• The device demonstrated excellent mechanical stability over 2000 cycles and confirmed degradation in sodium hydroxide solution.
• The sensor successfully detected subtle physiological signals like arterial pulse and various physical activities.

Conclusions:

• The developed DMF pressure sensor successfully integrates degradability and wide-range linearity, offering a sustainable solution for wearable electronics.
• This work advances the understanding of piezoresistive materials and opens avenues for designing eco-friendly, on-demand wearable devices.