Electrochemical deposition of gold at liquid–liquid interfaces studied by thin organic film-modified electrodes

Sefer, Birhan and Gulaboski, Rubin and Mirceski, Valentin (2012) Electrochemical deposition of gold at liquid–liquid interfaces studied by thin organic film-modified electrodes. Journal of Solid State Electrochemistry, 16 (7). pp. 2373-2381. ISSN 1432-8488

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Official URL: http://dx.doi.org/10.1007/s10008-011-1613-3

Abstract

The unique physico-chemical properties of gold nanoparticles portrayed in their chemical stability, the sizedependent electrochemistry, and the unusual optical properties make them suitable modifiers of various surfaces used in the fields of optical devices, electronics, and biosensors. In this work we present two different methods to obtain metallic gold nanoparticles at a liquid–liquid interface, and to control their growth by adjusting the experimental conditions. Decamethylferrocene (DMFC), used as an oxidizable compound dissolved in an organic solvent that is spread as a thin film on the surface of graphite electrode, serves as a redox partner to exchange electrons across the liquid–liquid interface with the other redox counter-partner [AuCl4]− present in the conjoined water phase. The interfacial electron transfer between the DMFC and the [AuCl4]− ions leads to deposition of metallic gold nanoparticles at the liquid– liquid interface. The structure and features of the deposited Au nanoparticles were studied by means of microscopic and voltammetric techniques. The morphology of the Au deposit depends on the concentration ratio of redox partners and both electrode and liquid–liquid interfacial potential differences. Depending on whether the Au deposit was obtained by ex situ (at open circuit potential) or by “in situ” (by cycling of the electrode potential) approach, we observed quite different effects to the ion transfer reactions probed by the thin-film electrode set-up. The possible reasons for the different behavior of the Au nanoparticles are discussed in terms of the structure and the properties of the obtained Au deposit. In separate experiments, we have demonstrated catalytic effects of the Au nanoparticles towards enhancing the electron transfer between DMFC and two aqueous redox substrates, hexacyanoferrate and hydrogen peroxide.

Item Type: Article
Uncontrolled Keywords: Ag-nanoparticles, AU-nanoparticles, biosensors, liquid-liquid interface
Subjects: Natural sciences > Biological sciences
Natural sciences > Chemical sciences
Natural sciences > Physical sciences
Divisions: Faculty of Agriculture
Depositing User: Rubin Gulaboski
Date Deposited: 31 Oct 2012 13:14
Last Modified: 05 Nov 2012 11:07
URI: http://eprints.ugd.edu.mk/id/eprint/157

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