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Ratiometric Optical Fiber Dissolved Oxygen Sensor Based on Fluorescence Quenching Principle
Yongkun Zhao1, Hongxia Zhang1, Qingwen Jin1,2
1Key Laboratory of Optoelectronics Information Technical Science, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China.
Sensors (Basel, Switzerland)
|July 9, 2022
Summary
This study developed a novel optical fiber sensor for dissolved oxygen using a ruthenium complex and quantum dots. The sensor shows high linearity and sensitivity for marine and environmental monitoring.
Area of Science:
- Analytical Chemistry
- Materials Science
- Environmental Science
Background:
- Accurate dissolved oxygen monitoring is crucial for aquatic ecosystems and environmental protection.
- Existing dissolved oxygen sensors may face limitations in sensitivity, stability, or application scope.
- Optical sensing offers a promising alternative for non-invasive and real-time dissolved oxygen measurements.
Purpose of the Study:
- To develop and characterize a ratiometric optical fiber sensor for dissolved oxygen detection.
- To investigate the performance of a ruthenium complex and quantum dots composite film for fluorescence quenching-based sensing.
- To evaluate the sensor's suitability for marine and environmental monitoring applications.
Main Methods:
- Fabrication of a composite sensitive film using Tris(4,7-diphenyl-1,10-phenanthrolin) ruthenium(II) dichloride complex and CdSe/ZnS quantum dots on a plastic optical fiber.
- Utilizing dynamic fluorescence quenching and the Stern-Volmer equation for oxygen concentration determination.
- Testing sensor performance in gaseous oxygen and aqueous solutions, assessing linearity, sensitivity, salinity stability, repeatability, and temperature characteristics.
Main Results:
- The sensor demonstrated a linear Stern-Volmer calibration plot for dissolved oxygen from 0 to 18.25 mg/L with 99.62% linearity.
- Sensitivity reached 0.0310/[O2] unit, with lower sensitivity observed in aqueous solutions compared to gaseous environments due to oxygen distribution and solubility.
- The sensor exhibited good stability, repeatability, and characterized temperature performance.
Conclusions:
- The developed ratiometric optical fiber sensor based on fluorescence quenching is effective for dissolved oxygen measurement.
- The sensor's performance characteristics suggest its potential utility in marine monitoring and environmental protection.
- Further optimization may enhance sensitivity in aqueous environments for broader applicability.
