Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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High-Sensitive Fiber-Optic pH Sensor Using Neutral Red Immobilized in Porous Sol-Gel Film

뉴트럴레드가 고정화된 다공성 졸-겔 필름을 이용한 고감도 광섬유 pH 센서의 특성

  • Jeon, Da-Yeong (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Yoo, Wook-Jae (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Shin, Sang-Hun (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Han, Ki-Tek (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Park, Jang-Yeon (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Park, Byung-Gi (Department of Energy & Environment Engineering, College of Engineering, Soonchunhyang University) ;
  • Cho, Seung-Hyun (Organic Materials & Fiber Engineering, College of Engineering, Soongsil University) ;
  • Lee, Bong-Soo (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University)
  • 전다영 (건국대학교 의료생명대학 의학공학부 의공학실용기술연구소) ;
  • 유욱재 (건국대학교 의료생명대학 의학공학부 의공학실용기술연구소) ;
  • 신상훈 (건국대학교 의료생명대학 의학공학부 의공학실용기술연구소) ;
  • 한기택 (건국대학교 의료생명대학 의학공학부 의공학실용기술연구소) ;
  • 박장연 (건국대학교 의료생명대학 의학공학부 의공학실용기술연구소) ;
  • 박병기 (순천향대학교 공과대학 에너지환경공학과) ;
  • 조승현 (숭실대학교 공과대학 유기신소재.파이버공학과) ;
  • 이봉수 (건국대학교 의료생명대학 의학공학부 의공학실용기술연구소)
  • Received : 2012.03.16
  • Accepted : 2012.05.15
  • Published : 2012.05.31
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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.

Keywords

References

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