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O(2)/pH multisensor based on one phosphorescent dye.

Nicolas B Borchert, Gelii V Ponomarev, Joe P Kerry

Analytical Chemistry

|December 2, 2010

Summary

A novel sensor uses a special dye to measure both oxygen and pH simultaneously. This innovative approach offers accurate, continuous monitoring with potential for sensing other substances.

Area of Science:

Analytical Chemistry
Materials Science

Background:

Development of a novel sensor system utilizing a phosphorescent metalloporphyrin dye embedded within a polymeric membrane.
The sensor is designed for the simultaneous measurement of two critical analytes: oxygen and pH.

Discussion:

The bifunctional dye exhibits dual sensing mechanisms: oxygen (O(2)) quenches phosphorescence intensity and lifetime, while protonation alters absorption spectra and reduces phosphorescence.
Two distinct measurement strategies are proposed: (i) simultaneous phosphorescence intensity (O(2), pH) and lifetime (O(2)) analysis, and (ii) parallel phosphorescence lifetime (O(2)) and ratiometric absorbance (pH) measurements.
The ratiometric absorbance method offers internal referencing and calibration-free operation for both analytes, enhancing sensor reliability.

Key Insights:

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The sensor enables precise quantification and continuous monitoring of oxygen and pH.

The phosphorescent dye's response to oxygen and protons allows for dual-analyte detection.

Calibration-free sensing is achievable using the ratiometric absorbance and phosphorescence lifetime measurement approach.

Outlook:

The described sensor technology demonstrates potential for extension to the detection of other analytes.
This platform could lead to advancements in multi-analyte sensing systems for environmental and biomedical applications.