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KMID : 1059520200640020074
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Journal of the Korean Chemical Society
2020 Volume.64 No. 2 p.74 ~ p.78
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A Fluorescent Sensor Film for Detecting pH of Acidic Solutions
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Min Jae-Young
Kim Hyung-Jin
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Abstract
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A push-pull conjugated dye (DCMP) was covalently immobilized on a silanized glass surface to produce a high sensitivity pH sensor film for operating in the acidic region. A pH-sensitive sensor film was prepared by photo-initiating copolymerization of a modified DCMP (DCMA), 2-hydroxyethyl methacrylate (HEMA) and triethylene glycol dimethacrylate on the silanized glass surface. The absorbance of the sensor film increased with increasing pH between pH 2.0 and 5.0, and the fluorescence intensity of the film also increased about 50 times with increasing pH in the same pH range. The sensor film was reversible and reproducible under acidic conditions. The sensor film showed a relatively short response time between 20?50 seconds and high selectivity for proton in the presence of various metal ions.
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KEYWORD
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Push-pull conjugated dye, pH sensor film, Fluorescent sensor film, Low pH, Photo-copolymerization
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