Surface resistance study of the different interactions of ClO4-, SO42-, C6H5SO3- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)

In this work is demonstrated that the Surface Resistance (SR) technique can be applied to study the different interactions of anions, such as, perchlorate, sulphate and benzenesulphonate and also a cation as Cu(II), with a gold film surface, even when the metal film surface is partially blocked with...

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Autor principal:	Tucceri, Ricardo Ismael
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2006
Materias:	Química
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/164787
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-164787
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Química
spellingShingle	Química Tucceri, Ricardo Ismael Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)
topic_facet	Química
description	In this work is demonstrated that the Surface Resistance (SR) technique can be applied to study the different interactions of anions, such as, perchlorate, sulphate and benzenesulphonate and also a cation as Cu(II), with a gold film surface, even when the metal film surface is partially blocked with an electroactive polymer film. The electroactive polymer poly(o-aminophenol) (POAP) was employed to cover the surface of the gold film electrode. Resistometric changes were detected even after the metal surface was completely covered with the polymer. Dependence of the resistance change on the external electrolyte composition for polymer thicknesses lower than 0.25 mC cm–2 was attributed to a competition, at the gold film surface, between the redox process of the polymer and adsorption of different species in the electrolyte. This result points to a discontinuous character of the polymer for thicknesses lower than 0.25 mC cm–2 at the metal\|polymer interface. For polymer thicknesses higher than 0.8 mC cm–2, the resistometric response becomes independent of both the external electrolyte composition and the polymer thickness. Thus, polymer thicknesses higher than 0.8 mC cm–2 seem to be compact enough at the metal\|polymer interface to prevent the interaction of species in the supporting electrolyte with the gold film surface. However, the resistometric changes observed, were attributed to the redox conversion of the polymer. In this connection, the redox conversion of POAP from amine to imine groups leads to an increase of the gold film resistance. This increase was explained as a transition from specular to diffuse scattering of the conduction electrons of gold at the gold\|POAP interface due to a less compact distribution of oxidised sites (imine) as compared with those of the reduced centers (amine).
format	Articulo Articulo
author	Tucceri, Ricardo Ismael
author_facet	Tucceri, Ricardo Ismael
author_sort	Tucceri, Ricardo Ismael
title	Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)
title_short	Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)
title_full	Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)
title_fullStr	Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)
title_full_unstemmed	Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)
title_sort	surface resistance study of the different interactions of clo<sub>4</sub>-, so<sub>4</sub><sup>2-</sup>, c<sub>6</sub>h<sub>5</sub>so<sub>3</sub>- and cu(ii) with a gold surface partially blocked with poly(-o-aminophenol)
publishDate	2006
url	http://sedici.unlp.edu.ar/handle/10915/164787
work_keys_str_mv	AT tucceriricardoismael surfaceresistancestudyofthedifferentinteractionsofclosub4subsosub4subsup2supcsub6subhsub5subsosub3subandcuiiwithagoldsurfacepartiallyblockedwithpolyoaminophenol
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spelling	I19-R120-10915-1647872024-04-13T04:38:29Z http://sedici.unlp.edu.ar/handle/10915/164787 Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol) Tucceri, Ricardo Ismael 2006 2024-04-12T17:19:37Z en Química In this work is demonstrated that the Surface Resistance (SR) technique can be applied to study the different interactions of anions, such as, perchlorate, sulphate and benzenesulphonate and also a cation as Cu(II), with a gold film surface, even when the metal film surface is partially blocked with an electroactive polymer film. The electroactive polymer poly(o-aminophenol) (POAP) was employed to cover the surface of the gold film electrode. Resistometric changes were detected even after the metal surface was completely covered with the polymer. Dependence of the resistance change on the external electrolyte composition for polymer thicknesses lower than 0.25 mC cm–2 was attributed to a competition, at the gold film surface, between the redox process of the polymer and adsorption of different species in the electrolyte. This result points to a discontinuous character of the polymer for thicknesses lower than 0.25 mC cm–2 at the metal\|polymer interface. For polymer thicknesses higher than 0.8 mC cm–2, the resistometric response becomes independent of both the external electrolyte composition and the polymer thickness. Thus, polymer thicknesses higher than 0.8 mC cm–2 seem to be compact enough at the metal\|polymer interface to prevent the interaction of species in the supporting electrolyte with the gold film surface. However, the resistometric changes observed, were attributed to the redox conversion of the polymer. In this connection, the redox conversion of POAP from amine to imine groups leads to an increase of the gold film resistance. This increase was explained as a transition from specular to diffuse scattering of the conduction electrons of gold at the gold\|POAP interface due to a less compact distribution of oxidised sites (imine) as compared with those of the reduced centers (amine). En este trabajo se demuestra que la técnica de medida de la Resistencia Superficial (RS) puede ser empleada para estudiar los diferentes tipos de interacción de aniones como perclorato, sulfato y bencensulfonato y del catión Cu(II), con la superficie de un film de oro, aún cuando esta superficie esté parcialmente cubierta con una película de un polímero electroactivo. Poli(o-aminofenol) (POAP) fue empleado como polímero electroactivo para cubrir la superficie de la película de oro. Cambios de resistencia superficial son observados, aún cuando la película de POAP que cubre la película de oro sea altamente compacta. Para espesores de polímero menores que 0,25 mC cm–2, la variación de la resistencia con la composición del electrolito fue atribuida a un proceso competitivo entre la adsorción superficial de especies contenidas en el electrolito y la propia reacción redox del material polimérico. Esto reflejaría el carácter discontinuo de una película polimérica delgada. Para espesores de polímero mayores que 0,8 mC cm–2, la respuesta resistométrica resulta independiente de la composición del electrolito externo y del espesor del polímero. Así, para espesores de polímero mayores que 0,8 mC cm–2, las películas de POAP parecen ser suficientemente compactas como para prevenir la interacción directa de las especies contenidas en el electrolito y la superficie de la película de oro. Sin embargo, la variación resistométrica, aún detectada, fue atribuida a la propia conversión redox del POAP. En este sentido, es sabido que la reacción redox del POAP implica la conversión de grupos amino a imino, lo que conduce a un incremento de la resistencia de la película de oro. Este aumento de resistencia es explicado sobre la base de una transición entre una dispersión electrónica especular a difusa en la interfase oro/POAP, debido a una distribución menos compacta de los sitios redox oxidados (grupos imino) del POAP comparada con la distribución de los centros reducidos (amino). Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 55-70

Surface resistance study of the different interactions of ClO<SUB>4</SUB>-, SO<SUB>4</SUB><SUP>2-</SUP>, C<SUB>6</SUB>H<SUB>5</SUB>SO<SUB>3</SUB>- and Cu(II) with a gold surface partially blocked with poly(-o-aminophenol)

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