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NIR optical carbon dioxide gas sensor based on simple azaBODIPY pH indicators.
M D Fernández-Ramos1, M L Aguayo-López2, E de Los Reyes-Berbel3
1ECsens. Department of Analytical Chemistry, University of Granada, Granada 18071, Spain and Unit of Excellence in Chemistry applied to Biomedicine and the Environment of the University of Granada, Spain. mdframos@ugr.es.
The Analyst
|May 22, 2019
Summary
New azaBODIPY dyes offer a sensitive method for determining carbon dioxide (CO2) gas. These photostable fluorescent indicators, entrapped in polymer membranes, provide rapid and reliable CO2 measurements with long-term stability.
Area of Science:
- Analytical Chemistry
- Materials Science
- Spectroscopy
Background:
- Development of sensitive and selective fluorescent probes for gas detection is crucial in environmental monitoring and industrial applications.
- Boron-dipyrromethene (azaBODIPY) dyes are known for their tunable optical properties and photostability.
- Accurate determination of carbon dioxide (CO2) gas requires robust and long-lasting sensing materials.
Purpose of the Study:
- To synthesize and characterize novel azaBODIPY dyes for the determination of CO2 gas.
- To evaluate the performance of these dyes as fluorescent indicators in a polymeric sensing membrane.
- To assess the stability, response time, and detection limits of the developed CO2 sensor.
Main Methods:
- Synthesis of two azaBODIPY dyes with absorption maxima at 620 nm and emission maxima at 675-720 nm.
- Noncovalent entrapment of dyes into polymer matrices with a luminophore, transfer phase agent, and plasticizer.
- Determination of optical properties (molar absorptivity, quantum yield) and pKa values.
- Testing of sensing membranes for response time, recovery time, detection limit, and storage stability for CO2 gas detection.
Main Results:
- Synthesized azaBODIPYs exhibit high molar absorption coefficients (7.1 × 104 and 2.1 × 104 M-1 cm-1) and fluorescence quantum yields (21% and 9%).
- The indicators show pKa values of 7.9 and 8.5, suitable for pH-dependent CO2 sensing.
- Polymer-entrapped sensors demonstrate rapid response (42-60 s) and recovery (103-120 s) times with low detection limits (0.04-0.57% CO2).
- Excellent photostability and storage time (>570 days) were observed for the sensing membranes.
Conclusions:
- The developed azaBODIPY-based fluorescent sensors are highly effective for CO2 gas determination.
- The sensing membranes offer excellent photostability, rapid response, and long-term usability.
- These indicators represent a promising advancement in optical sensing technology for CO2 monitoring.
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