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Electrochemical and impedance spectroscopy studies of various diazonium salts on a glassy carbon electrode

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Abstract

The derivatization of a glassy carbon electrode surface was achieved with and without electrochemical reduction of various diazonium salts in acetonitrile solutions. The surfaces were characterized, before and after their attachment, by cyclic voltammetry and electrochemical impedance spectroscopy to evidence the formation of a coating on the carbon surface. The results were indicative of the presence of substituted phenyl groups on the investigated surface. Also, the effects of diazonium thin films at the surface of a glassy carbon electrode, modification time, and salt concentration on their electrochemical responses in the presence of the Fe(CN) 3−/4−6 probe were investigated. Electrochemical impedance measurements indicated that the kinetics of electron transfer is slowed down when the time and the concentration used to modify the glassy carbon electrode are increased. We therefore modified a glassy carbon surface via its derivatization with and without electrochemical reduction of various diazonium salts in acetonitrile solution.

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Correspondence to Abbas A. Rostami.

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Khoshroo, M., Rostami, A.A. Electrochemical and impedance spectroscopy studies of various diazonium salts on a glassy carbon electrode. Monatsh Chem 141, 841–846 (2010). https://doi.org/10.1007/s00706-010-0335-z

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  • DOI: https://doi.org/10.1007/s00706-010-0335-z

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