Wearable H₂S Sensors with Enhanced Humidity Tolerance: Microcrumpled SnO₂ Quantum-Wire Films for Real-Time...

Area of Science:

• Materials Science
• Chemical Sensors
• Nanotechnology

Background:

• Detecting hydrogen sulfide (H2S) in humid conditions is challenging for wearable sensors due to humidity, flexibility, and power constraints.
• Existing room-temperature sensors struggle with performance degradation in humid environments.

Purpose of the Study:

• To develop a stretchable and humidity-resistant H2S sensor for wearable applications.
• To achieve efficient, low-power H2S detection at room temperature with enhanced stability and selectivity.

Main Methods:

• Fabrication of a stretchable H2S sensor using microcrumpled tin dioxide (SnO2) quantum-wire films.
• Surface energy modulation to enhance gas adsorption and minimize water accumulation.
• Testing sensor performance under various humidity levels (up to 80% RH) and continuous operation for 30 days.

Main Results:

• The sensor demonstrated rapid (<60 s) H2S detection with high sensitivity (0.01–5 ppm) and excellent selectivity.
• Maintained high performance even at 80% relative humidity, outperforming current room-temperature sensors.
• Exhibited long-term stability with minimal response fluctuations (2.08% RSD) over 30 days.

Conclusions:

• The microcrumpled SnO2 quantum-wire sensor offers a robust solution for reliable H2S detection in humid environments.
• The developed sensor technology is suitable for real-time, wireless monitoring in wearable devices and simulated industrial settings.
• This work addresses key environmental challenges hindering the development of advanced wearable gas sensors.