Journal
TALANTA
Volume 84, Issue 1, Pages 65-70Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2010.12.016
Keywords
Oxygen; Temperature; Optical sensor; Fluorescence; Dual sensor; Signal discrimination
Categories
Funding
- US Army [W81XWH-04-1-0781]
- National Institutes of Health [DK062990, DK072465, HD066331]
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In measuring specific conditions in the real world, there are many situations where both the oxygen concentration and the temperature have to be determined simultaneously. Here we describe a dual optical sensor for oxygen and temperature that can be adapted for different applications. The measurement principle of this sensor is based on the luminescence decay times of the oxygen-sensitive ruthenium complex tris-4,7-diphenyl-1,10-phenanthroline ruthenium(III) [Rudpp] and the temperature-sensitive europium complex tris(dibenzoylmethane) mono(5-amino-1,10-phenanthroline)europium(III) [Eudatp]. The excitation and emission spectra of the two luminophores overlap significantly and cannot be discriminated in the conventional way using band pass filters or other optical components. However, by applying both the frequency and time domain techniques, we can separate the signals from the individual decay time of the complexes. The europium complex is entrapped in a poly(methyl methacrylate) (PMMA) layer and the ruthenium complex is physically adsorbed on silica gel and incorporated in a silicone layer. The two layers are attached to each other by a double sided silicone based tape. The europium sensing film was found to be temperature-sensitive between 10 and 70 degrees C and the ruthenium oxygen-sensitive layer can reliably measure between 0 and 21% oxygen. (C) 2010 Elsevier B.V. All rights reserved.
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