Preparation and properties of sensing membrane for fiber optic oxygen sensor

Abstract

Four sensing membranes based on fluorescence quenching were prepared by sol-gel method and CA membrane method, and the Ru(II) complexes, Ru(bpy)₃Cl₂ and Ru(phen)₃Cl₂, were used as the indicators. The results indicate that the volume fraction of oxygenϕO₂ have a linear relationship in large scale with tanϕ0/tanϕfor all of the sensing membranes. They have super properties such as excellent limit of detection, fast response time and good reproducibility. The stability of the sensing membranes made by sol-gel method is better than those by CA membranes, but the uniformity of the latter is better than that of the former.

Keywords

fiber optic oxygen sensor / sensing membrane / fluorescence quenching

References

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

[2] Morisawa M, Uchiyama K, Hosaka H, . New Cladding Polymer for Optic Oxygen Sensor Using Fluorescent Plasic Fiber. Proc. SPIE, 1996, 2836: 336-336.

[3] Morisawa M, Vishmoi G, Hosaka T, Muto S. Comparative Studies on Sensitivity and Stability of Fiber—optic Oxygen Sensor Using Several Cladding Polymers. Jpn. J. Appl. Phys., Part 1, 1998, 37(8): 4620-4620.

[4] Fuchang Yuan, Xiangming Li, Binglu Mo, . A New Kinetic Equation on Luminescent Quenching. Chemical Journal of Chinese Universites, 1996, 17(7): 1048-1051.

[5] James N B, Thomas J M. Kinetics of the Oxidation of Fe (H₂O)₆ ²⁺ by Polypridine Complexes of Ru(II) Negative Enthalpies of Action. J. Am. Chem. Soc, 1973, 95: 3158-3164.

[6] Wanli Xing, Fuhuan Chao, Qizhou Chen, . application of Sol-gel Technology in the Fields of Chemical Sensors and Biosensors. Chemistry Magazine, 1999, 6: 39-43. (in Chinese)

[7] Grant Sheila A, Satcher Joe H, Bettenciourt Kerry. Development of Sol-gel-based Fiber Optic Nitrogen Dioxide Gas sensors. Sensors and Actuators B, 2000, 69: 132-137.

[8] McDonagh C, MacCraith B D, McEvoy A K. Tailoring of Sol-gel Films for Optical Sensing of Oxygen in Gas and Aqueous Phase. Anal. Chem., 1998, 70: 45-50.