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뉴트럴레드가 고정화된 다공성 졸-겔 필름을 이용한 고감도 광섬유 pH 센서의 특성High-Sensitive Fiber-Optic pH Sensor Using Neutral Red Immobilized in Porous Sol-Gel Film

Other Titles
High-Sensitive Fiber-Optic pH Sensor Using Neutral Red Immobilized in Porous Sol-Gel Film
Authors
전다영유욱재신상훈한기택박장연박병기조승현이봉수
Issue Date
2012
Publisher
한국센서학회
Keywords
Fiber-Optic Sensor; pH Sensor; Neutral Red; Sol-Gel; Absorbance
Citation
센서학회지, v.21, no.3, pp.223 - 228
Journal Title
센서학회지
Volume
21
Number
3
Start Page
223
End Page
228
URI
https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/15820
DOI
10.5369/JSST.2012.21.3.223
ISSN
1225-5475
Abstract
In this study, a fiber-optic pH sensor based on a pH sol-gel film is fabricated. The sol-gel film is made by co-polymerizing tetramethoxysilane, trimethoxymethylsilane, ethanol and distilled water. As a pH indicator, a neutral red is immobilized in a thin porous film formed by the sol-gel process. The pH change in a sensing probe gives rise to a change in the color of the pH sol-gel film, and the absorbance of reflected light through the pH sol-gel film is also changed. By using a spectrometer, therefore, the spectra of reflected lights in the sensing probe with different pH values are measured. Also, the relationships between the pH values and the absorbance are analyzed on the basis of the color variations of the pH sol-gel films. In repeated experiments, the fiber-optic pH sensor shows that it has reversibility, a high reproducibility and a wide absorbance change in a pH range from pH 5 to 9. Also, we confirmed that the fabricated pH sol-gel film exhibits a fast response time, little or no pH indicator leaching and a dynamic range of 2.04 dB from pH 5 to 9. Based on the results of this study, a fiber-optic pH sensor can be developed for the pH monitoring in the harsh environments.
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