Layer-by-layer self-assembled redox polyelectrolytes on passive steel

Steel samples were passivated in 0.1 M NaOH solutions at 0.3 V vs. Ag/AgCl (3 M KC1) and then poly(allylamine) derivatized with osmium pyridine- bipyridine-chloride complex and poly-(vinylsulfonate) were sequentially self-assembled electrostatically layer-by-layer. The resulting electrodes were exam...

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Autores principales: Völker, E., Calvo, E.J., Williams, F.J.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00212148_v48_n3-4_p305_Volker
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00212148_v48_n3-4_p305_Volker2023-10-03T14:20:46Z Layer-by-layer self-assembled redox polyelectrolytes on passive steel Völker, E. Calvo, E.J. Williams, F.J. Steel samples were passivated in 0.1 M NaOH solutions at 0.3 V vs. Ag/AgCl (3 M KC1) and then poly(allylamine) derivatized with osmium pyridine- bipyridine-chloride complex and poly-(vinylsulfonate) were sequentially self-assembled electrostatically layer-by-layer. The resulting electrodes were examined by cyclic voltammetry, ellipsometry, and X-ray Photoelectron Spectroscopy (XPS). These studies demonstrate the formation of a redox polyelectrolyte multilayer onto the passive film protecting the ferrous metal. As the number of deposited polyelectrolyte layers increases there is an increase in the measured thickness of the self-assembled film. The rate of thickness growth in osmium polymer film with the number of deposition cycles is slower for films thinner than ~30 nm. Cyclic voltammetry shows that the electron transfer rate to the outer sphere osmium complex tethered to the polymer backbone is much slower for the multilayer on passive iron than on gold surfaces. This is in agreement with the well-known behavior of soluble redox couples on passive metals and with electrochemical tunelling spectroscopy. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00212148_v48_n3-4_p305_Volker
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Steel samples were passivated in 0.1 M NaOH solutions at 0.3 V vs. Ag/AgCl (3 M KC1) and then poly(allylamine) derivatized with osmium pyridine- bipyridine-chloride complex and poly-(vinylsulfonate) were sequentially self-assembled electrostatically layer-by-layer. The resulting electrodes were examined by cyclic voltammetry, ellipsometry, and X-ray Photoelectron Spectroscopy (XPS). These studies demonstrate the formation of a redox polyelectrolyte multilayer onto the passive film protecting the ferrous metal. As the number of deposited polyelectrolyte layers increases there is an increase in the measured thickness of the self-assembled film. The rate of thickness growth in osmium polymer film with the number of deposition cycles is slower for films thinner than ~30 nm. Cyclic voltammetry shows that the electron transfer rate to the outer sphere osmium complex tethered to the polymer backbone is much slower for the multilayer on passive iron than on gold surfaces. This is in agreement with the well-known behavior of soluble redox couples on passive metals and with electrochemical tunelling spectroscopy.
format JOUR
author Völker, E.
Calvo, E.J.
Williams, F.J.
spellingShingle Völker, E.
Calvo, E.J.
Williams, F.J.
Layer-by-layer self-assembled redox polyelectrolytes on passive steel
author_facet Völker, E.
Calvo, E.J.
Williams, F.J.
author_sort Völker, E.
title Layer-by-layer self-assembled redox polyelectrolytes on passive steel
title_short Layer-by-layer self-assembled redox polyelectrolytes on passive steel
title_full Layer-by-layer self-assembled redox polyelectrolytes on passive steel
title_fullStr Layer-by-layer self-assembled redox polyelectrolytes on passive steel
title_full_unstemmed Layer-by-layer self-assembled redox polyelectrolytes on passive steel
title_sort layer-by-layer self-assembled redox polyelectrolytes on passive steel
url http://hdl.handle.net/20.500.12110/paper_00212148_v48_n3-4_p305_Volker
work_keys_str_mv AT volkere layerbylayerselfassembledredoxpolyelectrolytesonpassivesteel
AT calvoej layerbylayerselfassembledredoxpolyelectrolytesonpassivesteel
AT williamsfj layerbylayerselfassembledredoxpolyelectrolytesonpassivesteel
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