Polyaminoanthraquinone Modified Electrodes as Electroanalytical Sensors

Badawy, W. A., K. M. Ismail, and S. S. Medany, "Polyaminoanthraquinone Modified Electrodes as Electroanalytical Sensors", Int. J. Electrochem. Sci., 2011.


Poly 1-amino-9,10-anthraquinone, PAAQ, films were prepared by the electropolymerization of 1-amino-9,10-anthraquinone, AAQ, on platinum substrates. The polymerization process was carried out in both nonaqueous (Acetonitrile containing 0.1 mole L-1 LiClO4 as supporting electrolyte) or aqueous (6.0 mol L-1 H2SO4) media. The electropolymerization process is fast and economic. The prepared films are stable and have been used as sensors for the electroanalytical determination of p-aminophenol, ascorbic acid, dopamine, hydroquinone, catechol, pyrogallol, cerium chloride and epinephrine. The determination is based on the cyclovoltammogramic method. The cyclic voltammetry was always carried out under the same conditions, where a scan rate of 100 mV s-1 in the specified potential range for each electrolyte at room temperature were used. A range of concentration between 0.01 to 1.0x10-4 mol L-1 analyte was perfectly determined. The determination process is based on the oxidation peak currents of the analyte in the cyclic voltammogram obtained by the PAAQ modified electrode. A calibration curve was drawn for each analyte from which any unknown concentration in the specified range of measurements could be accurately obtained from the value of the peak current.