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Ratiometric Dissolved Oxygen Sensors Based on Ruthenium Complex Doped with Silver Nanoparticles
Zike Jiang1, Xinsheng Yu2, Shikui Zhai3
1Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China. jiangzike2011@126.com.
Sensors (Basel, Switzerland)
|March 12, 2017
Summary
A novel electrospun optical sensor film using silver nanoparticles and ruthenium complex offers rapid dissolved oxygen measurement in aqueous environments. This advanced sensor film provides improved response times for accurate oxygen monitoring in applications like algal studies.
Area of Science:
- Materials Science
- Analytical Chemistry
- Biotechnology
Background:
- Accurate dissolved oxygen (DO) measurement is critical for aquatic ecosystems and biological processes.
- Traditional DO sensors face limitations in response time and spatial resolution.
- Developing advanced optical sensing materials is essential for improved DO monitoring.
Purpose of the Study:
- To develop a ratiometric optical sensor for dissolved oxygen measurement using electrospinning.
- To enhance sensor performance, particularly response time, by incorporating silver nanoparticles (Ag NPs).
- To demonstrate the sensor's capability in monitoring oxygen dynamics in biological systems.
Main Methods:
- Fabrication of a sensing film using Ag NPs doped with tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dichloride complex (Ru(DPP)₃Cl₂) in plasticized polymethyl methacrylate (PMMA).
- Utilizing an insensitive Coumarin6 dye as a reference.
- Employing a 3CCD camera for pixel-wise oxygenation ratio calculation to quantify DO concentration.
- Evaluating sensor performance including response time, accuracy, limit of detection, stability, and photostability.
Main Results:
- Ag-containing films exhibited significantly improved response times (1.0 s deoxygenated to air, 45 s air to deoxygenated) compared to Ag-free films (2.0 s deoxygenated to air, 104 s air to deoxygenated).
- The sensor demonstrated accurate quantification of oxygen concentration in aqueous environments.
- Successful measurement of spatiotemporal oxygen distribution during photosynthesis and respiration of *Chlorella vulgaris* was achieved.
Conclusions:
- The electrospun nanofiber-based optical sensor film is a promising method for rapid dissolved oxygen monitoring in aqueous applications.
- The incorporation of silver nanoparticles enhances the sensor's response speed.
- The developed sensor shows potential for real-time monitoring of oxygen dynamics in biological and environmental systems.
