Characterisation of gold electrodes modified with self-assembled monolayers of l-cysteine for the adsorptive stripping analysis of copper

Electrochemical sensors for copper ions in environmental samples were prepared by modifying gold electrodes with l-cysteine by self-assembly. The adsorption of l-cysteine on gold electrodes was studied by electrochemical reductive desorption in 0.5 M KOH, and the interaction of l-cysteine with coppe...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2001-12, Vol.516 (1), p.10-16
Main Authors: Yang, Wenrong, Justin Gooding, J, Brynn Hibbert, D
Format: Article
Language:English
Subjects:
Adsorptive stripping voltammetry
Analytical chemistry
Chemistry
Cu(II) analysis
Electrochemical methods
Exact sciences and technology
l-Cysteine modified gold electrode
Self-assembled monolayers
XPS
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Summary:Electrochemical sensors for copper ions in environmental samples were prepared by modifying gold electrodes with l-cysteine by self-assembly. The adsorption of l-cysteine on gold electrodes was studied by electrochemical reductive desorption in 0.5 M KOH, and the interaction of l-cysteine with copper ions was investigated by cyclic voltammetry, chronoamperometry and X-ray photoelectron spectroscopy. At low concentrations the ratio of l-cysteine to bound Cu(II) is 2:1. At higher concentrations (0.1 M) copper reacts with adsorbed cysteine forming copper sulfide on the electrode surface. On a modified l-cysteine gold electrode, Osteryoung square wave voltammetric determination of Cu(II) with a detection limit below 5 ppb has been demonstrated.
ISSN:1572-6657
1873-2569
DOI:10.1016/S0022-0728(01)00649-0