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Polyaminoanthraquinone, PAAQ, films were preparedpotentiodynamically and potentiostatically fromacetonitrile/sulfuric acid mixed solvent. Series of investigationshave been carried out in which the mixed solvent ratio, type ofsubstrate, electrochemical technique, potential scan range, scanrate and number of cycles were investigated in order to optimizethe electropolymerization process. The potentiodynamic techniqueusing glassy carbon, GC, substrates provides more stable films anduseful information about the electropolymerization process fromthe mixed solvent. The suitable monomer concentration was 5.0 mMof 1-amino-9, 10-anthraquinone dissolved in 4.0 MH 2 SO 4 /ACN mixed solvent with a volume ratio7:3. The most suitable potential scan range was from − 0.5 to+ 1.4 V at a scan rate of100 mV s  – 1 . The effect of the scanrepetition  i. e.  the thickness of the preparedpolymer films on the electroanalytical performance of the modifiedelectrode was investigated and discussed. The kinetics ofelectropolymerization process was investigated and the reactionwas found to be first order with respect to the monomerconcentration and of negative order with respect to sulfuricacid. The formed films were used successfully as analyticalsensors for ascorbic acid, catechol, Ce III ions, dopamine,epinephrine, p-aminophenol and pyrogallol. The determination isbased on the construction of a calibration curve for each analyteusing the values of the oxidation peak currents in the cyclicvoltammogram obtained by the PAAQ modified electrode in eachcase. The data were compared with the data obtained previously bythe same films prepared in non-aqueous and aqueous media. Thesignificance of the analytical performance of the formed filmswith respect to the state-of-the-art was investigated anddiscussed. The use of the mixed solvent, beside its effectivenessas analytical sensor, has limited the effect of hazardous organicsolvent.

zeitschrift für physikalische chemie

Electropolymerization of Aminoanthraquinone from             H 2 SO 4 /Acetonitrile Mixed Solvent – Polymer             Film Characterization and its Use as Analytical             Sensor