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A fiber-optic evanescent wave sensor for dissolved oxygen detection based on novel hybrid fluorinated xerogels immobilized with [Ru(bpy)3]2+.

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      We have prepared a novel fiber-optic evanescent wave sensor (FEWS) for dissolved oxygen (DO) detection. The sensor fabrication was based on coating a decladded portion of an optical fiber with a microporous coating, which was prepared from 3,3,3-trifluoropropyltrimethoxysilane and n-propyltrimethoxysilane. The fluorophores were immobilized in the porous coating and excited by the evanescent wave field produced on the core surface of the optical fiber. The sensitivity of the sensor was quantified by the ratio of the fluorescence intensities in pure deoxygenated (I (0)) and in pure oxygenated environments (I). Results show that the quenching response of DO is increased with the enhancement of the coating surface hydrophobicity using the presented hybrid fluorinated ORMOSILs. The calibration curve of I (0)/I to [O(2)] is linear from 0 to 40 ppm and the detection limit is 0.05 ppm (3sigma) with a short response time of 15 s for DO detection.

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      [1 ] Dalian Institute of Chemical Physics, Department of Instrumentation and Analytical Chemistry, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
      Anal Bioanal Chem
      Analytical and bioanalytical chemistry
      Springer Nature America, Inc
      Jun 2009
      : 394
      : 3
      19306080 10.1007/s00216-009-2746-4


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