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Fiber-optic fluorescence sensor for dissolved oxygen detection based on fluorinated xerogel immobilized with ruthenium (II) complex

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Abstract

A fiber-optic sensor based on fluorescence quenching was designed for dissolved oxygen (DO) detection. The fluorinated xerogel-based sensing film of the present sensor was prepared from 3, 3, 3-trifluoropropyltrimethoxysilane (TFP–TriMOS). Oxygen-sensitive fluorophores of tris (2, 2′- bipyridine) ruthenium (II) (Ru(bpy) 2+3 ) were immobilized in the sensing film and the emission fluorescence was quenched by dissolved oxygen. In the sensor fabrication, a two-fiber probe was employed to obtain the best fluorescence collection efficiency and the sensing film was attached to the probe end. Scanning electron microscope (SEM), UV–Vis absorption spectroscopy (UV–Vis) and fourier transform infrared spectroscopy (FTIR) measurements have been used to characterize the sensing film. The sensor sensitivity is quantified by I deoxy/I oxy, where I deoxy and I oxy represented the detected fluorescence intensities in fully deoxygenated and fully oxygenated environments, respectively. Compared with tetramethoxysilane (TMOS) and methyltriethoxysilane (MTMS)-derived sensing films, TFP–TriMOS-based sensor exhibited excellent performances in dissolved oxygen detection with short response time of 4 s, low limit of detection (LOD) of 0.04 ppm (R.S.D. = 2.5%), linear Stern–Volmer calibration plot from 0 to 40 ppm and long-term stability during the past 10 months. The reasons for the preferable performances of TFP–TriMOS-based sensing film were discussed.

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Acknowledgments

This work was supported by the Chinese Academy of Sciences, (No. KZCX1-YW-14-3), the National Natural Science Foundation of China (No. 20635010) and the Ministry of Science and Technology of China on High Tech Program (No. 2008AA09Z110).

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Authors and Affiliations

  1. Department of Instrumentation and Analytical Chemistry, Key Laboratory of Separation and Analysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, People’s Republic of China

    Yan Xiong, Jing Xu, Dao-qian Zhu, Chun-feng Duan & Ya-feng Guan

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  1. Yan Xiong
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  2. Jing Xu
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  3. Dao-qian Zhu
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  4. Chun-feng Duan
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  5. Ya-feng Guan
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Correspondence to Ya-feng Guan.

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Xiong, Y., Xu, J., Zhu, Dq. et al. Fiber-optic fluorescence sensor for dissolved oxygen detection based on fluorinated xerogel immobilized with ruthenium (II) complex. J Sol-Gel Sci Technol 53, 441–447 (2010). https://doi.org/10.1007/s10971-009-2118-8

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  • DOI: https://doi.org/10.1007/s10971-009-2118-8

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