Electrochemical polymerization of an aniline-terminated self-assembled monolayer on indium tin oxide electrodes and its effect on polyaniline electrodeposition

Indium tin oxide (ITO) transparent electrodes were surface modified by a self-assembled monolayer of N-phenyl-γ-aminopropyl-trimethoxysilane (PAPTS). Cyclic voltammetry of the PAPTS monolayer in aniline-free aqueous electrolyte showed the typical shape of a surface-confined monomer, due to the oxida...

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Bibliographic Details
Published in:	Thin solid films Vol. 516; no. 15; pp. 4793 - 4802
Main Authors:	Cruz-Silva, Rodolfo, Nicho, María E., Reséndiz, Mary C., Agarwal, Vivechana, Castillón, Felipe F., Farías, Mario H.
Format:	Journal Article
Language:	English
Published:	Lausanne Elsevier B.V 02-06-2008 Elsevier Science
Subjects:	Atomic force microscopy Chemistry Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Electrochemistry Electrodeposition, electroplating Exact sciences and technology General and physical chemistry Indium tin oxide electrodes Kinetics and mechanism of reactions Materials science Methods of deposition of films and coatings; film growth and epitaxy Physics Polymerization Self-assembled monolayer Structure and morphology; thickness Surface-confined monomer Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Thin film structure and morphology X-ray photoelectron spectroscopy Atomic force microscopy Indium tin oxide electrodes Surface-confined monomer Electrochemistry Polymerization Self-assembled monolayer X-ray photoelectron spectroscopy Electron transfer Surface treatments Monomers Electropolymerization Thin films Cyclic voltammetry Conjugated polymer Tin oxide Electrodeposition Oxidation Electrodeposited coatings Polyanilines Indium tin oxide electrode Polymer films Self-assembled layers Layer thickness Indium oxide Spacer Morphology Monolayers Electrolytes X-ray photoelectron spectra
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Summary:	Indium tin oxide (ITO) transparent electrodes were surface modified by a self-assembled monolayer of N-phenyl-γ-aminopropyl-trimethoxysilane (PAPTS). Cyclic voltammetry of the PAPTS monolayer in aniline-free aqueous electrolyte showed the typical shape of a surface-confined monomer, due to the oxidation of the aniline moieties. This process resulted in a two-dimensional polyaniline film with uniform thickness of 1.3 nm, as measured by atomic force microscopy. X-ray photoelectron and UV–visible spectroscopic techniques confirm the formation of a conjugated polymer film. The influence of the surface modification of ITO electrodes on polyaniline electrochemical deposition was also studied. The initial oxidation rate of aniline increased in the PAPTS-modified ITO electrodes, although the overall film formation rate was lower than that of unmodified ITO electrodes. The morphology of the electrodeposited polyaniline films on PAPTS-modified and unmodified ITO electrodes was studied by atomic force microscopy. Films of smaller grain were grown in the PAPTS-modified ITO as compared to films grown on unmodified ITO. A blocking effect due to the propyl spacer is proposed to explain the reduced electron transfer in PAPTS-modified electrodes.
ISSN:	0040-6090 1879-2731
DOI:	10.1016/j.tsf.2007.08.128