Porous PDMS-ZnO Wearable Gas Sensor for Acetone Biomarker Detection and Breath Analysis.

Area of Science:

• Materials Science
• Nanotechnology
• Wearable Technology

Background:

• Growing demand for global health monitoring necessitates nonintrusive detection methods.
• Breath acetone (BrAce) analysis offers a noninvasive approach to health assessment.
• Development of flexible and robust sensors is crucial for wearable applications.

Purpose of the Study:

• To develop a compact, conformal wearable UV-assisted gas-sensing system for breath acetone detection.
• To analyze breath events and concentrations using a flexible sensor.
• To investigate the synergistic effects of UV irradiation and porous structure on sensor performance.

Main Methods:

• Fabrication of an intrinsically flexible porous polydimethylsiloxane (PDMS)-zinc oxide (ZnO) composite layer (PPZL).
• Utilizing ultraviolet (UV) irradiation to enhance gas-sensing properties.
• Testing sensor performance under mechanical strain (bending, tensile) and varying humidity.

Main Results:

• The UV-assisted wearable sensor reliably detects BrAce concentrations from 1 to 100 ppm at room temperature.
• The sensor maintains stable performance over 20 days with <5% signal degradation, even under mechanical strain.
• Accurate analysis of breathing patterns and BrAce concentrations was achieved, with consistent response under up to 70% relative humidity.

Conclusions:

• The developed flexible acetone gas sensor provides a portable solution for health management.
• The synergistic effect of UV and porous structure enhances acetone response and mechanical robustness.
• The fabrication method offers a pathway for designing flexible metal oxide gas sensors.