Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 173, Issue -, Pages 254-261Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.07.008
Keywords
Europium(III) ion; Luminescence; Optical fibre; Tridentate bis(phosphinic amide)-phosphine oxide; PVC membrane; Dip coating
Funding
- Regional Government of Andalusia [P07-FQM-2625, P07-FQM-2738]
- Spanish Ministry of Science and Innovation
- FEDER Program [2008-01394, 2008-0117, TEC2010-17085, TEC2010-20224-C02-01]
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A novel optical fibre probe based on a tridentate bis(phosphinic amide)-phosphine oxide PhPO(C6H4POPhN(CH(CH3)(2))(2))(2) (ligand 1) has been developed for the detection of europium(III) ions in water. The dip coating technique was used to deposit the ligand 1 encapsulated on a poly(vinyl chloride) membrane onto an optical fibre. The optimum deposition thickness of the membrane was 280 +/- 40 nm. The sensing mechanism relies on the reaction between europium(III) ion and ligand 1, which produces a strong luminescent complex of stoichiometry 1:2 Eu(III):Ligand 1 with a maximum emission peak around 612 nm. Two different configurations, aerial and aqueous, were tested for measuring the luminescence off-line and on-line, respectively. The proposed probe showed a response time of 92 s in the aqueous configuration (in situ detection of europium(III) ions in water). The luminescence of the proposed probe displayed a power-law response for the europium(III) concentration in a broad range of concentrations of at least 5 orders of magnitude, from 10 nM to 1 mM, with a correlation coefficient (R-2) of the fitted curve better than 0.99. (C) 2012 Elsevier B.V. All rights reserved.
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