Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 516, Issue 1-2, Pages 10-16Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(01)00649-0
Keywords
self-assembled monolayers; L-cysteine modified gold electrode; Cu(II) analysis; XPS; adsorptive stripping voltammetry
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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(H) with a detection limit below 5 ppb has been demonstrated. (C) 2001 Elsevier Science BY. All rights reserved.
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