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2017 | 22 | 159-165
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An optical fluorescent sensor based on a chitosan thin film co-doped with Eu3+ and a bromothymol blue pH indicator has been developed. Near-UV to visible (350–400 nm) excitation of the europium (III) chelate complexes with 1,3-diphenyl-1,3-propanedione exhibits a typical lanthanide emission with maximum at 618 nm. Luminescent spectra of the Eu3+ complex were found to be insensitive to the presence of methylamine gas. Therefore, bromothymol blue, a non-fluorescent pH indicator with an absorbance maximum of deprotonated form close to the Eu3+ emission band was added to the film to provide a non-fluorescent reversible response to different methylamine concentrations, which can be detected by measuring the Eu3+ emission.
Physical description
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