Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 14, Issue 8, Pages 1383-1390Publisher
SPRINGER
DOI: 10.1007/s10008-009-0965-4
Keywords
3-mercaptopropyltrimethoxysilane; Gold electrode; Self-assembly; Copper hexacyanoferrate
Categories
Funding
- FAPEMIG [CEX 00202/08, CEX APQ-3716-5.02/07]
- FAPESP
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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 abroken vertical bar cm(2)) was lower than for AuS/CuHCF6 (27.9 abroken 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.
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