Voltammetric studies on the adsorption and electrode reaction of dopamine at electrochemically pretreated glassy carbon electrodes

Abstract

The characteristics of the adsorption and electron transfer of dopamine (DA) at freshly polished and electrochemically pretreated glassy carbon (GC-20) electrodes have been investigated by linear scanning voltammetry (l.s.v.), cyclic scanning voltammetry (c.s.v.) and differential pulse voltammetry (d.p.v.). The adsorption of DA resulted in enhanced electrochemical reactivity at freshly polished electrodes. The pretreatment was found to increase the number of active centres for the adsorption-enhanced electron transfer of DA. The active centres were characterized as carbonyl or quinone groups by c.s.v. and d.p.v. analyses of the surface of pretreated electrodes.