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Electrospun fibers of 7-methyl-4-phenyl-8-(4’-methoxy)phenylazopyrazolo[5,1-c][1,2,4]triazine-3-carboxylic acid ethyl ester  (PCA-4)  and 7-methyl-4-phenyl-8-(2’-methoxy)phenylazopyrazolo[5,1-c][1,2,4]triazine-3-carboxylic acid ethyl ester  (PCA-2)  were produced using electrospinning technique. Poly(methylmethacrylate) (PMMA) was used as support electrospun polymer. The morphological and chemical characterizations of the  PCA-4/PMMA  and  PCA-2/PMMA  electrospun fibers were carried out by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy analysis (SEM-EDX). The electrochemical behavior of the  PCA-4/PMMA  and  PCA-2/PMMA  fibers onto ITO electrodes was examined by cyclic voltammetry (CV) measurements. The new  PCA-4/PMMA  and  PCA-2/PMMA  fibers were used for phosphate anion sensing.  PCA-4/PMMA  fiber indicated the best current response to 0.2 M phosphate buffer solution at −0.67 V.

Investigation of the electrochemical behaviors of fibers containing new pyrazolo[5,1-c][1,2,4]triazine derivatives