Fast-response Phosphorescence Sensor for Dissolved Oxygen Detection Based on PtOEP/TiO₂/CB@PFFE Sensing Film

Area of Science:

• Materials Science
• Analytical Chemistry
• Polymer Chemistry

Background:

• Dissolved oxygen (DO) monitoring is crucial in various environmental and industrial applications.
• Developing fast-response and highly sensitive DO sensors remains a significant challenge.
• Phosphorescence-based sensing offers potential for sensitive and selective DO detection.

Purpose of the Study:

• To develop a novel, fast-response phosphorescence sensor for dissolved oxygen (DO) detection.
• To engineer a tri-layer sensing film (PtOEP/TiO2/CB@PFFE) for enhanced sensor performance.
• To investigate the impact of light-scattering and light-blocking layers on sensor sensitivity and stability.

Main Methods:

• Synthesized a fluorinated polymer PFFE matrix via free radical polymerization.
• Fabricated a tri-layer sensing film by embedding PtOEP, TiO2, and CB within the PFFE matrix.
• Characterized the sensor's response time, recovery time, reproducibility, reversibility, stability, and sensitivity using Stern-Volmer analysis.

Main Results:

• The PtOEP/TiO2/CB@PFFE sensor exhibited a fast response time of 30 s and recovery time of 150 s.
• The tri-layer structure significantly enhanced phosphorescence intensity and lifetime, improving detection sensitivity.
• Achieved a high Stern-Volmer constant (Ksv = 0.4584 L/mg) and correlation coefficient (R = 0.9993), indicating high sensitivity for DO detection.
• Demonstrated excellent reproducibility, reversibility, and stability of the sensor.

Conclusions:

• The developed PtOEP/TiO2/CB@PFFE sensing film is effective for fast and highly sensitive dissolved oxygen detection.
• The incorporation of light-scattering and light-blocking layers is crucial for optimizing sensor performance.
• This phosphorescence sensor shows great promise for accurate and reliable DO monitoring applications.