A highly sensitive and reproducible fluorescence sensor for continuously measuring hydrogen peroxide at the sub-ppm...

Area of Science:

• Chemical Sensors
• Analytical Chemistry
• Materials Science

Background:

• Hydrogen peroxide (H2O2) is a key industrial chemical.
• Accurate monitoring of H2O2 is crucial for various applications.
• Existing detection methods may lack sensitivity or real-time capabilities.

Purpose of the Study:

• To design a highly sensitive fluorescence sensor for low-concentration hydrogen peroxide.
• To enable real-time monitoring of hydrogen peroxide levels.
• To develop a cost-effective and reproducible sensor for industrial use.

Main Methods:

• Utilized palladium or platinum on activated charcoal as catalysts.
• Employed an oxygen-sensitive layer with photostable oxygen probes.
• Measured real-time oxygen concentration produced from H2O2 decomposition.

Main Results:

• Achieved high sensitivity, detecting H2O2 down to 20 parts per billion (ppb).
• Demonstrated measurement ranges of 0.1-100 ppm and 0.02-100 ppm.
• Exhibited a fully reversible response with a response time under one minute.

Conclusions:

• The developed sensor offers sensitive and rapid H2O2 detection.
• Catalytic decomposition of H2O2 coupled with oxygen sensing provides a viable detection strategy.
• The sensor's reproducibility, affordability, and performance indicate strong potential for industrial applications.