Electrochemical Response of a Vitreous Carbon Electrode Modified by a Thiomacrocyclic Compound Film

A Langmuir-Schaefer (LS) film of a thiomacrocyclic (ThM) compound was deposited on the surface of a glassy carbon electrode (GCE) rod, from a subphase containing Cu(II) ions. The voltammetric response of this modified GCE when the ThM was bonded to Cu2+, showed that the LS film moved the oxidation p...

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Bibliographic Details
Main Author: Guaus,E. (author)
Other Authors: Torrent-Burgués,J. (author)
Format: article
Language:eng
Published: 2007
Subjects:
modified electrodes
Langmuir-Schaefer films
cyclic voltammetry
surface-complexation reaction
Online Access:http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100012
Country:Portugal
Oai:oai:scielo:S0872-19042007000100012
Description
Summary:A Langmuir-Schaefer (LS) film of a thiomacrocyclic (ThM) compound was deposited on the surface of a glassy carbon electrode (GCE) rod, from a subphase containing Cu(II) ions. The voltammetric response of this modified GCE when the ThM was bonded to Cu2+, showed that the LS film moved the oxidation peaks of copper to more positive values. On the other hand, a LS film of the ThM compound was deposited on the surface of a GCE rod from a subphase of pure water. When the voltammetric response of the GCE-ThM electrode was studied in a Cu2+-SO4(2-) solution, it was found that the modified electrode increases its sensitivity respect to Cu2+ at low bulk Cu2+ concentrations in solution, and a surface-complexation reaction is proposed to explain the effect of the LS film on the GCE surface.

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