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An emission based optical CO2 sensor fabricated on grating-like TiO2 substrates using HPTS.
Ozan Yilmaz1, Faruk Ebeoglugil1, Ilkyaz Aydin2
1Dokuz Eylul University, The Graduate School of Natural and Applied Sciences, Buca, Izmir, 35390, Turkey; Dokuz Eylul University, Department of Metallurgical and Materials Engineering, Buca, 35390, Izmir, Turkey.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|October 21, 2023
Summary
A new carbon dioxide (CO2) sensor uses HPTS dye on titanium dioxide (TiO2) substrates for enhanced sensitivity and stability. This optical sensor demonstrates significant potential for CO2 quantification applications.
Area of Science:
- Materials Science
- Chemical Sensing
- Nanotechnology
Background:
- Titanium dioxide (TiO2) is a versatile material with applications in photocatalysis, sensing, and solar cells.
- Developing sensitive and stable CO2 sensors is crucial for environmental monitoring and industrial processes.
Purpose of the Study:
- To present a stable and sensitive CO2 sensor based on HPTS dye immobilized on TiO2 substrates.
- To investigate the CO2-induced emission signal changes and excited state lifetimes of HPTS.
- To evaluate the long-term stability and potential applications of the developed sensor.
Main Methods:
- Immobilization of HPTS dye onto TiO2 substrates.
- Excitation of HPTS at 466 nm and measurement of fluorescence intensity.
- Exposure of the sensor to varying CO2 concentrations (0.0-100.0% pCO2).
- Measurement of bi-exponential excited state lifetimes in the presence and absence of CO2.
Main Results:
- HPTS exhibited an 8.4-fold enhanced emission signal on TiO2 compared to polymeric supports.
- CO2 induced intensity quenching of HPTS emission, with I0/I100 values ranging from 6.5 to 13.3.
- Emission-based signal changes were more pronounced than lifetime-based variations.
- The sensor demonstrated long-term stability of up to 16 months.
Conclusions:
- The TiO2-based HPTS sensor offers high optical response and long-term stability for CO2 quantification.
- The sensor's sensitivity, blue LED excitation compatibility, and robustness make it a promising candidate for practical CO2 sensing applications.
