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...

Descripción completa

Detalles Bibliográficos
Publicado: 2008
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00212148_v48_n3-4_p305_Volker
http://hdl.handle.net/20.500.12110/paper_00212148_v48_n3-4_p305_Volker
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00212148_v48_n3-4_p305_Volker
record_format dspace
spelling paper:paper_00212148_v48_n3-4_p305_Volker2023-06-08T14:42:02Z 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 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00212148_v48_n3-4_p305_Volker 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.
title Layer-by-layer self-assembled redox polyelectrolytes on passive steel
spellingShingle 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
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00212148_v48_n3-4_p305_Volker
http://hdl.handle.net/20.500.12110/paper_00212148_v48_n3-4_p305_Volker
_version_ 1768543735720706048

Ejemplares similares