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Characterisation of gold electrodes modified with self-assembled monolayers of l-cysteine for the adsorptive stripping analysis of copper
journal contribution
posted on 2001-12-14, 00:00 authored by Wenrong YangWenrong Yang, J Gooding, D HibbertElectrochemical 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.
History
Journal
Journal of electroanalytical chemistryVolume
516Issue
1-2Pagination
10 - 16Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0368-1874Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2001, Elsevier Science B.V.Usage metrics
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self-assembled monolayersI-Cysteine modified gold electrodeCu(II) analysisXPSadsorptive stripping voltammetryScience & TechnologyPhysical SciencesChemistry, AnalyticalElectrochemistryChemistryL-cysteine modified gold electrodeELECTROCHEMICAL DETERMINATIONPOLAROGRAPHIC INVESTIGATIONSALKANETHIOLATE MONOLAYERSENZYME ELECTRODESAMMONIACAL MEDIUMAQUEOUS-SOLUTIONSGLUCOSE-OXIDASEDESORPTIONCYSTINEVOLTAMMETRY
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