A Dual-Signal Ratiometric Optical Sensor Based on Natural Pine Wood and Platinum(II) Octaethylporphyrin with High...

Area of Science:

• Materials Science
• Analytical Chemistry
• Biomedical Engineering

Background:

• Optical oxygen sensors are valuable but susceptible to light source and equipment instability.
• Developing robust sensors with internal referencing is crucial for reliable measurements.

Purpose of the Study:

• To create a dual-signal ratiometric oxygen sensor using intrinsic pine wood luminescence as a reference.
• To enhance sensor stability and accuracy by mitigating external fluctuations.

Main Methods:

• Fabrication of a PtOEP/PDMS@Pine sensor integrating pine wood and platinum(II) octaethylporphyrin (PtOEP).
• Utilizing the luminescence ratio of pine wood to PtOEP (Optical Parameter, OP) for oxygen concentration ([O2]) measurement.
• Evaluating sensor performance including linearity, anti-interference, hydrophobicity, photostability, and long-term stability.

Main Results:

• A linear relationship between OP and oxygen concentration (10-100 kPa) was established.
• The sensor demonstrated excellent anti-interference, hydrophobicity (contact angle 118.3°), and photostability.
• Long-term stability (90 days), fast response (1.4 s), and recovery (1.7 s) were achieved, with effective correction for temperature and photobleaching.

Conclusions:

• The PtOEP/PDMS@Pine sensor provides a stable and accurate method for optical oxygen sensing.
• The dual-signal ratiometric approach effectively corrects for environmental interference, enabling reliable measurements in complex conditions.