Optical oxygen sensing based on the luminescence quenching of europium(III) complex immobilized in fluoropolymer film

New optical oxygen sensors based on the luminescence intensities of four different europium(III) complexes, ((1, 10-phenanthroline)tris(thenoyltrifluoroacetonato)europium(III) complex ([Eu(tta)(3)phen]), tris(thenoyltrifluoroacetonato)europium(III) dihydrate ([Eu(tta)(3)] . 2H(2)O)), tris(1,1,1-trifluoro-5.5-dimethyl-2A-hexanedionato)europium(III)complex ([Eu(pta)(3)] . 2H(2)O) and tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato) complex ([Eu(fod)(3)]. 2H(2)O)) immobilized in poly(styrene-co-2,2.2-trifluoroethyl methacrylate) (poly-(styrene-co-TFEM)) films were developed. The luminescence intensity of the europium(III) complex films decreased with increasing the oxygen concentration. Stern-Volmer plots of the europium(III) complex films exhibited considerable linearity. The K-SV values of [Eu(ttt)(3)phen]. [Eu(tta)(3)]. 2H(2)O, [Eu(pta)(3)]. 2H(2)O and [Eu(fod)(3)]. 2H(2)O in films were estimated to be 0.015, 0.005, 0.002 and 0.003 %(-1) respectively. The large K-SV value of the [Eu(tta)(3)phen] film was obtained compared with the other europium(III) complexes. The response times of the europium(III) complex films are 6.7 s for [Eu(tta),phen], 6.7 s for [Eu(tta)(3)phen]. 2H(2)O, 6.6 s for [Eu(tta)(3)]. 2H(2)O and 7.6 s for [Eu(fod)(3)]. 2H(2)O on going from argon to oxygen and 7.0 s for [Eu(tta)(3)phen].7.5 s for [Eu(tta)(3)]. 2H(2)O, 8.1 s for [Eu(pta)(3)]. 2H(2)O and 8.6 s for [Eu(fod)(3)]. 2H(2)O on going from oxygen to argon, respectively. A highly sensitive oxygen sensor using [Eu(tta)(3)phen] immobilized in poly-(styrene-co-TFEM) film has been developed.