Web Release Date: January 31,
Probing of the Voltammetric Features of Graphite Electrodes Modified with Mercaptoundecanoic Acid Stabilized Gold Nanoparticles
lia D. S. Cordeiro,
and
CIQ-UP L4, Faculdade de Ciências, and REQUIMTE, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
Received: October 3, 2007
In Final Form: November 8, 2007
Abstract:
In this work we report on the remarkable voltammetric features of graphite electrodes, which were modified with mercaptoundecanoic acid derivatized gold nanoparticles (Au-MUA NPs) by simple adsorption from basic aqueous solution. Atomic force microscopy measurements proved a fairly uniform adsorption of the nanoparticles in the form of clusters, and consecutive island formation. The electrochemical features of the modified electrodes were probed by cyclic voltammetry, while using various redox probes in several different setups. The catalytic effects of the adsorbed clusters on the graphite electrodes proved to be highly reproducible, time dependent, and of nonselective nature. The main advantages of the proposed methodology are seen by the simplicity of the modification procedure, the stability of the self-assembled gold nanoparticle film, their applicability in various voltammetric scenarios, and the potential employment of the Au-MUA NP modified electrodes as sensors for various systems.
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