pH sensor based on a detection sol-gel layer onto optical fiber

被引：35
|
作者：
Belhadj Miled, Othman [1 ]
Ben Ouada, Hafedh [1 ]
Livage, Jacques [2 ]
机构：
[1] Département de Physique, Faculté des Sciences de Monastir, Monastir, Tunisia
[2] Laboratoire Chimie de la Matière Condensée, UMR 7574, Université Paris VI, 4 place Jussieu, 75252 Paris, France
来源：
Materials Science and Engineering C | 2002年 / 21卷 / 1-2期
关键词：
Absorption - Deposition - Leaching - Optical fibers - pH - Silica - Sol-gels - Titration;
D O I：
10.1016/S0928-4931(02)00100-5
中图分类号：
学科分类号：
摘要：
A pH sensor was made via the deposition of detection layer onto an optical fiber. This layer contains a pH-sensitive dye [thymol blue (TB)] trapped within a sol-gel silica matrix. The light was launched directly at the front of the fiber with an angle chosen in order to increase the power transmitted by the evanescent wave. This technique was used to induce the absorption of the dye. TB can be used both as an acid or a bse titration indicator. However, the response of the optical device in acid conditions is rather poor and only the alkaline transition in the pH range 8-12 has been exploited. The dye appears to be firmly trapped within the silica matrix and no leaching is observed during repetitive experiments. © 2002 Published by Elsevier Science B.V.
引用
收藏
页码：183 / 188
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