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Radioluminescent light source for the development of optical sensor arrays
William G Holthoff1, Elizabeth C Tehan, Rachel M Bukowski
1Department of Chemistry, Natural Sciences Complex, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, USA.
Analytical Chemistry
|January 15, 2005
Summary
A novel radioluminescent (RL) light source, using strontium-90, offers a power-free, stable excitation method for chemical-responsive sensor arrays (CRSAs). Its performance is statistically equivalent to traditional light sources, though data acquisition is longer.
Area of Science:
- Materials Science
- Analytical Chemistry
- Sensor Technology
Background:
- Photonically based chemical-responsive sensor arrays (CRSAs) require reliable excitation light sources.
- Traditional light sources often consume electrical power and can be bulky.
- Developing compact, self-powered, and stable light sources is crucial for advanced sensor applications.
Purpose of the Study:
- To evaluate a novel radioluminescent (RL) light source for its utility in powering chemical-responsive sensor arrays (CRSAs).
- To compare the performance of RL-excited sensor platforms against those excited by conventional laser and LED sources.
- To determine the analytical figures of merit for two distinct CRSA configurations using the RL source.
Main Methods:
- Fabrication of two tris(4,7'-diphenyl-1,10'-phenathroline)ruthenium(II)-doped xerogel sensor platforms: a planar 5x5 array and frustum-shaped poly(styrene) pillars.
- Excitation of sensor platforms using a strontium-90 (90Sr) radionuclide and plastic scintillator-based RL light source.
- Comparative performance analysis against excitation by a He-Cd laser and a blue light-emitting diode (LED).
Main Results:
- The RL light source, emitting blue light (lambda(max) = 435 nm), successfully excited analyte-responsive luminophores in both sensor platforms.
- Performance metrics from the RL-excited sensors were statistically equivalent to those obtained with laser and LED excitation.
- The RL light source demonstrated advantages of no electrical power consumption, compactness, simplicity, and signal stability.
Conclusions:
- The evaluated radioluminescent light source is a viable, power-efficient alternative for exciting chemical-responsive sensor arrays.
- While offering significant advantages in portability and stability, the RL source necessitates longer data acquisition times due to lower radiant power.
- This technology holds promise for developing advanced, self-contained photonic sensor systems.