STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening

The growth mode and structure of gold overlayers resulting from the electroreduction of thick oxide films are studied using potentiodynamic and potentiostatic techniques combined with ex-situ STM and SEM. Electroreduction of the thick gold oxide at low overpotentials, that is slowly grown gold overl...

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Detalles Bibliográficos
Autores principales:	Vazquez, Luis, Bartolomé, A., Baró, Arturo M., Alonso, Concepción, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1989
Materias:	Ciencias Exactas Química Electroquímica scanning electron microscopy scanning tunneling microscopy Oro electroreduction electrodeposition
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/82994
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-82994
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Exactas Química Electroquímica scanning electron microscopy scanning tunneling microscopy Oro electroreduction electrodeposition
spellingShingle	Ciencias Exactas Química Electroquímica scanning electron microscopy scanning tunneling microscopy Oro electroreduction electrodeposition Vazquez, Luis Bartolomé, A. Baró, Arturo M. Alonso, Concepción Salvarezza, Roberto Carlos Arvia, Alejandro Jorge STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening
topic_facet	Ciencias Exactas Química Electroquímica scanning electron microscopy scanning tunneling microscopy Oro electroreduction electrodeposition
description	The growth mode and structure of gold overlayers resulting from the electroreduction of thick oxide films are studied using potentiodynamic and potentiostatic techniques combined with ex-situ STM and SEM. Electroreduction of the thick gold oxide at low overpotentials, that is slowly grown gold overlayers, results in a close-packed array of grains exhibiting a low roughness factor. Grains in the order of 100 nm of radii are formed by aggregation of small monomers. At higher overpotentials, fast grown gold overlayers, we suggest that the monomer growth results in a columnar structure terminated on rounded domes with radii ranging between 10 and 20 nm. This overlayer exhibits a roughness factor which increases according to electrodeposit height. The columnar structure is unstable decreasing its surface free energy by coalescence of small columns to form large units leading to a drastic decrease in the surface area with ageing time. A mechanism for the growth mode is proposed where the crystallite size depends on the diffusion length of the electrodepositing particles which is controlled by the applied overpotential.
format	Articulo Articulo
author	Vazquez, Luis Bartolomé, A. Baró, Arturo M. Alonso, Concepción Salvarezza, Roberto Carlos Arvia, Alejandro Jorge
author_facet	Vazquez, Luis Bartolomé, A. Baró, Arturo M. Alonso, Concepción Salvarezza, Roberto Carlos Arvia, Alejandro Jorge
author_sort	Vazquez, Luis
title	STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening
title_short	STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening
title_full	STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening
title_fullStr	STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening
title_full_unstemmed	STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening
title_sort	stm-sem combination study on the electrochemical growth mechanism and structure of gold overlayers: a quantitative approach to electrochemical metal surface roughening
publishDate	1989
url	http://sedici.unlp.edu.ar/handle/10915/82994
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bdutipo_str	Repositorios
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STM-SEM combination study on the electrochemical growth mechanism and structure of gold overlayers: A quantitative approach to electrochemical metal surface roughening

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