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Vol. 27, Special Issue, May 2014, pp. 22-28

 

Bullet

 

Electrochemical Study of Modified Glassy Carbon Electrode with Carboxyphenyl Diazonium Salt
in Aqueous Solutions
 

1 Mariem BOUROUROU, 1 Houcine BARHOUMI, 1 Abderrazak MAAREF and 2 Nicole JAFFREZIC-RENAULT

1 Laboratory of Interfaces and Advanced Materials (LIMA), University of Monastir 5000, Tunisia
2 Laboratory of Analytical Sciences, UMR CNRS 5180, University of Claude Bernard-Lyon1, Bâtiment Raulin, 69622 Villeurbanne Cedex, France
1 Tel.: + (216) 73 500 278, fax: + (216) 73 500 280

E-mail: Houcine.Barhoumi@fsm.rnu.tn

 

Received: 31 December 2012 /Accepted:10 August 2013 /Published:26 May 2014

Digital Sensors and Sensor Sysstems

 

Abstract: The covalent grafting of carboxyphenyl functionalities to planar carbon substrates by reaction with 2-carboxybenezenediazonium salt has been studied in aqueous acid solution. The surface was characterized, before and after the functionnalization process, by cyclic voltammetry, electrochemical impedance spectroscopy and linear sweep voltammetry (LSV) in order to control and to prove the formation of a coating on the carbon surface. The results indicate the presence of substituted phenyl groups on the investigated surface. Electrochemical impedance measurements show that the slowing down of the electron transfer kinetics was more evident by increasing the number of cycles resulting to higher DEp and RCT parameters. Besides, the effect of the pH on the electron transfer processes of the Fe(CN)63-/4- at the modified electrode is studied. By changing the solution pH the terminal group’s charge state would vary, based on which the surface pKa value is estimated.

 

Keywords: Diazonium salts, Glassy carbon (GC), Cyclic voltammetry, Impedance spectroscopy Surface pKa.

 

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