Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/60240
Type: Artigo de periódico
Title: Influence of copper hexacyanoferrate film thickness on the electrochemical properties of self-assembled 3-mercaptopropyl gold electrode and application as a hydrazine sensor
Author: de Morais, A
Pissetti, FL
Lucho, AMS
Gushikem, Y
Abstract: A copper hexacyanoferrate film was obtained on a modified electrode prepared by self-assembly of 3-mercaptopropyltrimethoxysilane on a gold surface. The film thickness was controlled using a layer-by-layer technique to tune the electrocatalytic properties of the electrode. Two electrodes with different hexacyanoferrate film thicknesses were prepared via three immersions (AuS/CuHCF3) and six immersions (AuS/CuHCF6) of the film in the precursor solutions. Cyclic voltammetry data were obtained to determine the adequate film thickness. Scanning electron microscopy images showed a roughness increase due to the growth of the film thickness at the electrode surface. Electrochemical impedance spectroscopy showed distinct behavior for the two electrodes prepared; while diffusion and charge transfer processes can be observed in both electrodes, an additional capacitive process at intermediary frequencies was observed for the AuS/CuHCF6 electrode. The charge transfer resistance (R (ct)) for the AuS/CuHCF3 electrode (19.6 a"broken vertical bar cm(2)) was lower than for AuS/CuHCF6 (27.9 a"broken vertical bar cm(2)) due to the hexacyanoferrate film thickness, since the charge transfer process demands the simultaneous diffusion of K(+) into the surface. Cyclic voltammetry was used to evaluate the application of the AuS/CuHCF3 electrode as an electrochemical sensor, revealing a linear correlation for hydrazine concentrations.
Subject: 3-mercaptopropyltrimethoxysilane
Gold electrode
Self-assembly
Copper hexacyanoferrate
Country: EUA
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s10008-009-0965-4
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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