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  • Title: High-performance oxygen sensors based on Eu(III) complex/polystyrene composite nanofibrous membranes prepared by electrospinning.
    Author: Wang Y, Li B, Zhang L, Zuo Q, Li P, Zhang J, Su Z.
    Journal: Chemphyschem; 2011 Feb 07; 12(2):349-55. PubMed ID: 21275027.
    Abstract:
    An optical oxygen sensor based on an Eu(III) complex/polystyrene (PS) composite nanofibrous membrane is prepared by electrospinning. The emission intensity of [Eu(TTA)(3) (phencarz)] (TTA=2-thenoyltrifluoroacetonate, phencarz=2-(N-ethylcarbazolyl-4)imidazo[4,5-f]1,10-phenanthroline) decreases with increasing oxygen concentration, and thus the [Eu(TTA)(3) (phencarz)]/PS composite nanofibrous membranes can be used as an optical oxygen-sensing material based on emission quenching caused by oxygen. Elemental analysis, UV/Vis absorption spectra, scanning electron microscopy (SEM), fluorescence microscopy, luminescence-intensity quenching Stern-Volmer plots, and excited-state decay analysis are used to characterize the obtained oxygen-sensing materials. A high sensitivity (I(N2) /I(O2)) of 3.38 and short response and recovery times (t(↓) =5.0, t(↑) =8.0 s) are obtained. These results are the best values reported for oxygen sensors based on Eu(III) complexes. The high surface area-to-volume ratio and porous structure of the electrospun nanofibrous membranes are taken to be responsible for the outstanding performance.
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