Resolving Cross-Sensitivity Effect in Fluorescence Quenching for Simultaneously Sensing Oxygen and Ammonia...

Area of Science:

• Chemical Sensors
• Analytical Chemistry
• Materials Science

Background:

• Simultaneous multi-gas sensing is crucial for practical applications.
• Cross-sensitivity between gases is a major challenge in fluorescent-based sensors.
• Existing methods struggle with accurate detection in mixed gas environments.

Purpose of the Study:

• To develop a novel analysis method to overcome cross-sensitivity in simultaneous gas sensing.
• To accurately estimate gas concentrations despite interference between analytes.
• To improve the performance of fluorescent-based gas sensors for practical use.

Main Methods:

• Fabrication of a dual-dye sensor on filter paper using platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) and eosin-Y.
• Systematic investigation of cross-sensitivity effects between oxygen (O2) and ammonia (NH3).
• Development and application of a new analysis method to correct for cross-interference.

Main Results:

• The novel analysis method significantly reduced O2 detection error from -11.4% ± 34.3% to 2.0% ± 10.2% in a mixed NH3 and N2 background.
• Demonstrated the feasibility of simultaneous O2 and NH3 sensing with improved accuracy.
• Quantified the cross-sensitivity effects between the two gases on the fluorescent dyes.

Conclusions:

• The proposed analysis method effectively mitigates cross-sensitivity issues in simultaneous gas sensing.
• This approach enhances the reliability and accuracy of fluorescent-based multi-gas sensors.
• The findings pave the way for more practical and precise gas detection systems.