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Sol–Gel‐based Fluorescent Sensor for Measuring pH Values in Acidic Environments
Author(s) -
Min Jae Young,
Kim Hyung Jin
Publication year - 2020
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12055
Subject(s) - fluorescence , absorbance , ph indicator , absorption (acoustics) , chemistry , ultraviolet , sol gel , photochemistry , analytical chemistry (journal) , materials science , chromatography , nanotechnology , optoelectronics , optics , organic chemistry , physics , composite material
This article describes the fabrication and pH sensing characteristics of a sol–gel‐derived fluorescent sensor film. A fluorescent pH sensor film operating in an acidic solution was prepared by synthesizing a fluorescent dye having triethoxysilyl pendant group (DPMS) and covalently immobilizing DPMS on a sol–gel porous film. The sensor film shows maximum absorption near 374 nm and a maximum emission near 564 nm when irradiated with ultraviolet light at 374 nm. Both the fluorescence intensity and the absorbance of the sensor film increased with increasing pH. In particular, the fluorescence intensity of the sensor film increased 2.1 times in the pH range of 0.3– 6.5. The sensor film is reproducible, reversible, and stable even after repeated measurements in acidic solution, and it has a long life of more than 1 month without dye leaching.