ELECTROCATALYTIC OXIDATION OF ASCORBIC ACID AT POLYPYRROLE THIN FILM INCORPORATING
PALLADIUM PARTICLES
CHARIF DEHCHAR*,†,§, IMENE CHIKOUCHE‡,
ROCHDI KHERRAT*, SAIDA ZOUGAR*and AHMED ZOUAOUI‡
*Laboratory of Environmental Engineering, Faculty of Engineering Sciences,
University of Badji Mokhtar, P.O. Box 12, Annaba 23000, Algeria
†Research Center in Industrial Technologies CRTI, P.O. Box 64, Cheraga 16014, Algeria
‡Laboratoire Croissance et Caracterisation de Nouveaux Semi-Conducteurs,
Faculty of Technology, University of Ferhat Abbas Setif 1,
Setif 19000, Algeria
§dcharif@hotmail.fr
Received 30 August 2016 Revised 28 December 2016 Accepted 21 February 2017
Published 6 April 2017
In this paper, we report a simple sensing strategy for electrochemical determination of ascorbic acid (AA) using a combination of polypyrrole (PPy) thin ¯lm and palladium particles composites deposited onton-doped silicon (Si) substrate. A two-step electrochemical process was employed to synthesize the composite ¯lms: At ¯rst, PPy ¯lm (average thickness 200 nm) was electro- generated on Si substrate from an organic solution of the pyrrole under galvanostatic conditions.
Secondly, palladium particles were electrodeposited on PPy/Si surface from a separate solution by chronoamperometry technique. The surface morphology analysis of the obtained composites shows a uniform dispersion of palladium particles onto the polymer matrix and reveals that the electrodeposition time has a signi¯cant e®ect on the amount and size of the incorporated palla- dium particles. The electrochemical reactivity of the Pd–PPy/Si-modi¯ed electrodes towards the oxidation of AA was studied by cyclic voltammetry method in 0.1 M, pH 7.0 phosphate bu®er solution. The oxidation current was proportional to the concentration of AA in the range of 0.5–10 mM with a detection limit of 0.2 mM.
Keywords: Ascorbic acid; composite; electrocatalysis; electropolymerization; palladium; polypyrrole.
§Corresponding author.
Surface Review and Letters, Vol. 24, No. 8 (2017) 1750118 (10 pages)
°c World Scienti¯c Publishing Company DOI:10.1142/S0218625X17501189
1750118-1
