Novel luminescent Ir(III) dyes for developing highly sensitive oxygen sensing films

Area of Science:

• Materials Science
• Analytical Chemistry
• Photochemistry

Background:

• Accurate detection of molecular oxygen (O2) is crucial in various scientific and industrial fields.
• Existing oxygen sensing methods may lack sensitivity or require specific operating conditions.
• Luminescent probes offer potential for sensitive and non-invasive oxygen detection.

Purpose of the Study:

• To develop novel sensing films for molecular oxygen detection.
• To investigate the performance of iridium(III) dye-based films incorporated into different matrices.
• To identify the most sensitive film for controlling oxygen concentrations between 0-10% and for trace oxygen sensing (<1%).

Main Methods:

• Synthesis and characterization of luminescent iridium(III) dye-based films.
• Incorporation of dyes into polystyrene (with/without plasticizer) and nanostructured metal oxide materials.
• Evaluation of film sensitivity using parameters p(O2) (S=1/2) for 0-10% O2 and DeltaI(1%) for <1% O2.

Main Results:

• Nanostructured metal oxide matrices significantly enhanced film sensitivity compared to polystyrene.
• The N1001 dye immobilized in AP200/19 demonstrated high sensitivity for 0-10% O2 control (k(sv)=2848+/-101 bar(-1), p(O2) (S=1/2)=0.0006).
• The N969 dye incorporated into AP200/19 showed excellent performance for oxygen trace sensing (DeltaI(1%)=93.13+/-0.13%).

Conclusions:

• The developed iridium(III) dye-based sensing films are effective for molecular oxygen detection.
• Nanostructured materials provide a superior platform for enhancing oxygen sensor sensitivity.
• Specific dye-matrix combinations offer tailored solutions for both general oxygen monitoring and trace analysis.