Sol-gel coating-based fiber O2/DO sensors

Mahmoud R. Shahriari; Jack Y. Ding; J. Tong; George H. Sigel Jr.

doi:10.1117/12.170670

10 March 1994 Sol-gel coating-based fiber O₂/DO sensors

Mahmoud R. Shahriari, Jack Y. Ding, J. Tong, George H. Sigel Jr.

Proceedings Volume 2068, Chemical, Biochemical, and Environmental Fiber Sensors V; (1994) https://doi.org/10.1117/12.170670
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

An intrinsic fiber optic environmental sensor has been developed for on-line monitoring of oxygen gas and dissolved oxygen (DO). In this O₂/DO sensor, a highly stable compound [Tris-(4,7-Diphenyl-1, 10-phenanthroline) Ruthenium (II) complex] is synthesized and selected as a chemical indicator for oxygen. A hybrid matrix is designed by a sol-gel process and used as a stable substrate for the immobilization of Ru compound. The microporous nature of the nondensified sol-gel coating, in which the photochemical dye is immobilized, provides a unique local structure that is environmentally stable and immune to photochemical bleaching and chemical leaching. The doped hybrid material is then coated on a porous optical fiber substrate used as the sensing component. The oxygen penetrates into the interconnective porous core and interacts with the immobilized Ru compound in which in-line dynamic luminescence quenching takes place. The use of Ru(ph2phen)3[2+] as a highly stable, reagent sensing indicator and also the use of the sol-gel coating technique for the immobilization and incorporation of Ru compound to porous core optical fibers have resulted in the development of an intrinsic O₂/DO sensor with high sensitivity, reproducibility, and long-term stability.

Citation Download Citation

Mahmoud R. Shahriari, Jack Y. Ding, J. Tong, and George H. Sigel Jr. "Sol-gel coating-based fiber O₂/DO sensors", Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); https://doi.org/10.1117/12.170670

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