Personal ammonia sensor for industrial environments.

Area of Science:

• Chemical sensors
• Materials science
• Optoelectronics

Background:

• Ammonia (NH3) is a key industrial chemical and a potential environmental/health hazard.
• Personal monitoring requires sensitive, selective, and rapid detection methods.
• Existing ammonia sensors often lack portability or speed for real-time personal use.

Purpose of the Study:

• To develop a compact, opto-chemical sensor for ammonia detection.
• To enable real-time personal monitoring of ammonia concentrations.
• To evaluate sensor performance, including sensitivity, response time, and cross-sensitivity.

Main Methods:

• Fabrication of sensor platforms with cyanine dye immobilized in microporous glass thin films.
• Integration of embossed grating couplers for compact optical design and waveguiding.
• Testing sensor response to ammonia in the 5-100 ppm range and assessing cross-sensitivity to water and other interferents.

Main Results:

• The developed sensor exhibits reversible ammonia sensitivity within the 5-100 ppm range.
• Rapid response times of under 2 minutes were achieved for ammonia detection.
• The sensor's cross-sensitivity to water and other potential interferents was evaluated.

Conclusions:

• The opto-chemical sensor is suitable for personal monitoring tasks.
• The sensor design offers a compact optical solution with effective waveguiding.
• The sensor demonstrates promising performance for real-time ammonia detection.