期刊
ANALYTICA CHIMICA ACTA
卷 480, 期 2, 页码 275-283出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0003-2670(02)01653-7
关键词
carbon dioxide; sensor; fluorescence; lifetime; sol-gel
An optical sensor for the measurement of high levels of carbon dioxide in gas phase has been developed. It is based on fluorescence resonance energy transfer (FRET) between a long-lifetime ruthenium polypyridyl complex and the pH-active disazo dye Sudan III. The donor luminophore and the acceptor dye are both immobilised in a hydrophobic silica sol-gel/ethyl cellulose hybrid matrix material. Tetraoctylammonium hydroxide (TOA-OH) is used as an internal buffering system. Fluorescence lifetime is measured in the frequency domain, using low-cost phase modulation measurement technology. The use of Sudan III as an acceptor dye has enabled the sensor to have a dynamic range up to 100% carbon dioxide. The sensor displays 11.2degrees phase shift between the limit of detection (LOD) of 0.06 and 100% CO2 with a resolution of better than 2%. The encapsulation in the silica/polymer hybrid material has provided the sensor with good mechanical and chemical stability. The effect of molecular oxygen, humidity and temperature on the sensor performance was studied in detail. (C) 2003 Elsevier Science B.V. All rights reserved.
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