Mindaugas Gicevičius, Juzef Kucinski, A. Ramanavičienė
Nov 1, 2019
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Influential Citations
34
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Journal
Dyes and Pigments
Abstract
Abstract The effect of copolymerization with o-phenylenediamine on polyaniline optical pH sensing properties is studied in this paper. The polyaniline and o-phenylenediamine based copolymers were formed electrochemically by potential cycling. Molecular structures of the deposited copolymer layers were investigated by Fourier-transform infrared spectroscopy. The pH sensing properties of resulting copolymer layers were studied by spectrophotometric titration as the function of o-phenylenediamine concentration in the polymerization solution. It was determined that pH at which the deposited polymer film exhibited the highest change in absorbance with respect to the change in solution acidity could be adjusted from pH 5.9 to pH 6.7 by the addition of the small amount of o-phenylenediamine to the polymerization solution. The potential applicability of the presented findings has been also discussed. The simplicity of here presented method could be found useful in the design of optical pH and gas sensing systems dedicated for various applications.