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Proceedings Paper

Stability studies of a pH-sensitive polymer matrix: applications to fiber optic pH sensors
Author(s): M. Allen Northrup; Kevin C. Langry; S. Michael Angel
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Paper 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.

Paper Details

Date Published: 1 July 1990
PDF: 7 pages
Proc. SPIE 1201, Optical Fibers in Medicine V, (1 July 1990); doi: 10.1117/12.17561
Show Author Affiliations
M. Allen Northrup, Lawrence Livermore National Lab. (United States)
Kevin C. Langry, Lawrence Livermore National Lab. (United States)
S. Michael Angel, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 1201:
Optical Fibers in Medicine V
Abraham Katzir, Editor(s)

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