Fiber-optic pH sensor based on sol-gel film immobilized with neutral red

In this study, we developed a fiber-optic pH sensor based on a sol-gel film immobilized with neutral red (NR). A solgel film was prepared by mixing tetramethylorthosilicate (TMOS), trimethoxymethylsilane (MTMS), ethanol (EtOH), distilled water (H 2 O), and NR powder. Accordingly, the thin pH sol-gel...

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Bibliographic Details
Published in:Optical review (Tokyo, Japan) Japan), 2013-03, Vol.20 (2), p.209-213
Main Authors: Jeon, Dayeong, Yoo, Wook Jae, Seo, Jeong Ki, Shin, Sang Hun, Han, Ki-Tek, Kim, Seon Geun, Park, Jang-Yeon, Lee, Bongsoo
Format: Article
Language:English
Subjects:
Atomic
Lasers
Microwaves
Molecular
Optical and Plasma Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum Optics
Regular Paper
RF and Optical Engineering
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Summary:In this study, we developed a fiber-optic pH sensor based on a sol-gel film immobilized with neutral red (NR). A solgel film was prepared by mixing tetramethylorthosilicate (TMOS), trimethoxymethylsilane (MTMS), ethanol (EtOH), distilled water (H 2 O), and NR powder. Accordingly, the thin pH sol-gel film was fabricated through a sol-gel process with a dip-coating method. The thickness and diameter of the fabricated pH sol-gel film are 0.11 and 0.6 mm, respectively. We measured the optical absorbance and the light intensity with the spectra of reflected light, which change with the color variation of the pH sol-gel film in the fiber-optic sensing probe. From the experimental results, we demonstrated that the proposed fiber-optic pH sensor has good reversibility, reproducibility, and a fast response time, in which the optical properties of the NR-based pH sol-gel film change with the pH value.
ISSN:1340-6000
1349-9432
DOI:10.1007/s10043-013-0037-y