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A Fiber-Optic Evanescent Wave O2 Sensor Based on Ru(II)-Doped Fluorinated ORMOSILs

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Abstract

A novel fiber-optic evanescent wave sensor (FOEWS) for O2 detection based on [Ru(bpy)3]2+-doped hybrid fluorinated ORMOSILs (organically modified silicates) has been developed. The sensing element was fabricated by dip-coating the optical fiber with [Ru(bpy)3]2+-doped hybrid fluorinated ORMOSILs composed of n-propyltrimethoxysilane (n-propyl-TriMOS) and 3, 3, 3-trifluoropropyltrimethoxysilane (TFP–TriMOS). Fluorophores of [Ru(bpy)3]2+ were excited by the evanescent wave field produced on the fiber core surface and the emission fluorescence was quenched by O2. Spectroscopic properties have been characterized by FTIR and UV–VIS absorption measurements. By using the presented hybrid fluorinated ORMOSILs, which enhances the coating surface hydrophobicity, the quenching response is increased. The sensitivity of the sensor is 7.5, which is quantified in terms of the ratio I N2/I O2 (I N2 and I O2 represent the fluorescence intensities in pure N2 and pure O2 environments, respectively). The limit of detection (L.O.D.) is 0.01% (3σ) and the response time is about 1 s. Meanwhile, the proposed FOEWS has the advantages of easy fabrication, low cost, fast response and suitable sensitivity for oxygen monitoring using a cheap blue LED as light source and coupling a miniature PMT detector directly to the optical fiber probe.

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Acknowledgements

This work was supported by the Chinese Academy of Sciences, Grant No. KZCX1-YW-14-3, and was partly supported by the Ministry of Science and Technology of China, Grant No.2008AA09Z110.

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Authors and Affiliations

  1. Department of Instrumentation and Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China

    Yan Xiong, Daoqian Zhu, Shiheng Chen, Hong Peng & Yafeng Guan

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  1. Yan Xiong
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  2. Daoqian Zhu
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  3. Shiheng Chen
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  4. Hong Peng
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  5. Yafeng Guan
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Correspondence to Yafeng Guan.

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Xiong, Y., Zhu, D., Chen, S. et al. A Fiber-Optic Evanescent Wave O2 Sensor Based on Ru(II)-Doped Fluorinated ORMOSILs. J Fluoresc 20, 269–274 (2010). https://doi.org/10.1007/s10895-009-0550-3

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  • DOI: https://doi.org/10.1007/s10895-009-0550-3

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