Stability studies of a pH-sensitive polymer matrix: applications to fiber optic pH sensors

M. Allen Northrup; Kevin C. Langry; S. Michael Angel

doi:10.1117/12.17561

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1 July 1990 Stability studies of a pH-sensitive polymer matrix: applications to fiber optic pH sensors

M. Allen Northrup, Kevin C. Langry, S. Michael Angel

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Proceedings Volume 1201, Optical Fibers in Medicine V; (1990) https://doi.org/10.1117/12.17561
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

A ratiometric pH-sensitive fluorescent dye (hydroxypyrenetrisulfonic acid) was covalently attached to an acrylamide polymer. These pH-sensitive copolymers were either covalently bonded to the end of an optical fiber or polymerized into separate gels. Long-term, accelerated aging studies were performed on the fibers and gels in 43°C distilled H20. The fiber-immobilized optrodes gave good pH responses for up to 2 months. The pH-sensitive gels were physically attached to optical fibers and gave very good pH responses for over one year. These physically immobilized, one-year-old, pH-sensitive copolymers provided optrodes with linear pH responses between pH 6 and 8 and resolution greater than 0.25 pH unit. A simple photostability experiment on these optrodes showed that they were very photostable. The results of this study indicate that pH-sensitive copolymers in a simple optrode design can be employed as pH sensors with useful lifetimes exceeding one year.

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M. Allen Northrup, Kevin C. Langry, and S. Michael Angel "Stability studies of a pH-sensitive polymer matrix: applications to fiber optic pH sensors", Proc. SPIE 1201, Optical Fibers in Medicine V, (1 July 1990); https://doi.org/10.1117/12.17561

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