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Luminescence temperature sensing using poly(vinyl alcohol)-encapsulated Ru(bpy)3 2+ films
Andrew Mills1, Cheryl Tommons, Raymond T Bailey
1Department of Pure & Applied Chemistry, University of Strathclyde, Glasgow, UKG1 1XL. a.mills@strath.ac.uk
The Analyst
|March 29, 2006
Summary
Ruthenium(II) tris(bipyridyl) luminescence remains temperature-sensitive even when encapsulated in PVA, unaffected by oxygen. This property is crucial for developing advanced sensors.
Area of Science:
- Photochemistry
- Materials Science
- Chemical Sensing
Background:
- Ruthenium(II) diimine complexes exhibit luminescence sensitive to oxygen and temperature.
- Encapsulation in polymers can reduce oxygen quenching but may impact temperature sensitivity.
- Ruthenium(II) tris(bipyridyl) (Ru(bpy)3 2+) is a well-studied luminescent complex.
Purpose of the Study:
- To investigate the luminescence properties of Ru(bpy)3 2+ encapsulated in polyvinyl alcohol (PVA).
- To determine the dependence of luminescence on oxygen concentration and temperature.
- To assess the suitability of encapsulated Ru(bpy)3 2+ for sensing applications.
Main Methods:
- Encapsulation of Ru(bpy)3 2+ in PVA films.
- Measurement of luminescence intensity as a function of oxygen concentration.
- Measurement of luminescence intensity as a function of temperature.
- Fitting luminescence data to an Arrhenius-type equation.
Main Results:
- Luminescence of encapsulated Ru(bpy)3 2+ was independent of oxygen concentration.
- Luminescence remained highly sensitive to temperature changes.
- Thermal quenching was described by an Arrhenius-type equation.
- An energy gap (ΔE) of 3100 cm(-1) was determined for the quenching process.
Conclusions:
- PVA encapsulation effectively eliminates oxygen quenching of Ru(bpy)3 2+ luminescence.
- The retained temperature sensitivity of encapsulated Ru(bpy)3 2+ is promising for thermal sensing applications.
- The luminescence quenching mechanism involves a non-radiative deactivation pathway.
