Preparation and properties of fiber optic oxygen sensing material by thermo-polymerization method

Abstract

A new kind of fiber optic oxygen sensing material based on the fluorescence quenching of Ru(bpy)₃Cl₂ was prepared by the themo-polymerization method. The ruthenium dye was immobilized in N, N-methylene bisacrylamide(MBBA) polymer by physically trapping while MBBA was covalently cross-linked on the glass micro-beads by NaHSO₃-O₂-MnSO₄ initiator system. The lock-in amplifyication technology was used for the detection of their sensing properties. The influences of indicator concentration, glass micro-beads diameter, post polymerization time, concentration and reaction time of glutaraldehyde on the properties of sensing materials were studied. To optimize the influencing factors to the sensing materials, the indicator concentration of 0.7 g/L, glass micro-beads diameter of 0.3 mm, post polymerization time of 5 h were achieved. The immobilization stability of ruthenium dye and the performance of the sensing materials were improved by the new polymerization system. An absolute detection limit of 3×10-6 (V/V) and the response time of 10 s were obtained. This kind of sensing materials has good stability and their life time is 2 years.

Keywords

thermo-polymerization / fiber optic sensing materials / stability

References

[1] Yang B. C., Jian I. W., Duan J. H. Principle and Development of Oxygen Sensor[J]. Sensor World, 2002, 1: 3-10.

[2] Jiang D. S., Chen X., Liu E. Preparation and Properties of Sensing Membrane for Fiber Optic Oxygen Sensor[J]. Journal of Wuhan University of Technology—Mater. Sci. Ed., 2002, 17(2): 51-53.

[3] Shariari M. R., Ding J. Y., Tong J. Sol-gel Coating Based Fiber Optic O₂/DO Sensors[J]. SPIE, 1994, 2086: 224-240.

[4] McNamara K. P., Li X. P., Stull A. D. Fiber-optic Oxygen Sensor Based on the Fluorescence Quenching of Tris(5-acrylamido,1, 10 phenanthroline)Ruthenium Chloride[J]. Anal. Chim. Acta., 1998, 361: 73-83.

[5] Rosenzweig Z., Kopelman R. Development of a Submicrometer Optical Fiber Oxygen Sensor[J]. Anal. Chem., 1995, 67: 2650-2654.

[6] Kopelman R., Rosenzweig Z. Analytical Properties of Miniaturized Oxygen and Glucose Fiber Optic Sensors[J]. Sensors and ActuatorsB, 1996, 35–36: 475-483.

[7] Li X. P., Rosenzweig Z. A Fiber Optic Sensor for Rapid Analysis of Bilirubin in Serum[J]. Analytica Chinica Acta, 1997, 353: 263-273.

[8] Braddock N. J., Meyer T. J. Kinetics of the Oxidation of Fe(H₂O)₆ ²⁺ by Polypyridine Complexes of Ruthenium(II) Negative Enthalpies of Act Activation[J]. J. of the American Chemical Society, 1973, 95(10): 3158-3162.

[9] Wu X. C., He J. Q. Studies of Aqueous Polymerization of Acrylamide Initiated by NaHSO₃-O₂-MnSO₄ System[J]. Polym. Commun., 1986, 6: 402-406.

[10] Zhu J., Zhu X. L., Cheng Z. P. The Plasma Initiated Polymerization of N-substituted Acrylamides and Properties of Polymers[J]. Chinese Journal of Applied Chemistry, 2002, 19(1): 53-57.