Fiber-Optic pH Sensor with Monolayer Indicator

Yuji KAWABATA; Kiyoshi TSUCHIDA; Totaro IMASAKA; Nobuhiko ISHIBASHI

doi:10.2116/analsci.3.7

Yuji KAWABATA, Kiyoshi TSUCHIDA, Totaro IMASAKA, Nobuhiko ISHIBASHI

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Keywords: Optrode, pH sensor, optical fiber, fluorescein, monolayer

JOURNAL FREE ACCESS

1987 Volume 3 Issue 1 Pages 7-9

DOI https://doi.org/10.2116/analsci.3.7

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Abstract

A fiber-optic pH sensor has been constructed by immobilizing fluorescein isothiocyanate (FITC) on the end surface of the optical fiber. The pH response is reversible in the range 4.0-6.9, precision being±0.1. Due to implantation of FITC as a monolayer, the intrinsic response time is less than 10ms.

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