In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics

Structural changes of silver terrace domains in aqueous perchloric acid solution at constant anodic current density (j) and room temperature were followed by <i>in situ</i> scanning tunneling microscopy sequential imaging. For j<15 μA cm<sup>-2</sup> silver electrodissolut...

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Autores principales: Vela, María Elena, Andreasen, Gustavo, Salvarezza, Roberto Carlos, Hernández Creus, A., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Ciencias Exactas
Química
Scanning tunneling microscopy
Silver crystal surfaces
Kinetics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121346
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121346
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
Scanning tunneling microscopy
Silver crystal surfaces
Kinetics
spellingShingle Ciencias Exactas
Química
Scanning tunneling microscopy
Silver crystal surfaces
Kinetics
Vela, María Elena
Andreasen, Gustavo
Salvarezza, Roberto Carlos
Hernández Creus, A.
Arvia, Alejandro Jorge
In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics
topic_facet Ciencias Exactas
Química
Scanning tunneling microscopy
Silver crystal surfaces
Kinetics
description Structural changes of silver terrace domains in aqueous perchloric acid solution at constant anodic current density (j) and room temperature were followed by <i>in situ</i> scanning tunneling microscopy sequential imaging. For j<15 μA cm<sup>-2</sup> silver electrodissolution proceeds at step edges without roughening. Conversely, for j<15 μA cm<sup>-2</sup> the silver surface becomes progressively rougher to attain, after a certain critical time, a steady roughness. In this case, the dynamic scaling theory applied to STM images indicates that the dissolving silver surface can be described as a self-affine fractal surface with a static roughening exponent α50.9060.06, and a dynamic roughening exponent β50.3660.08. The value of a is consistent with the relevant role played by surface diffusion in the silver electrodissolution mechanism, whereas the value of b is slightly higher than those derived from growth models incorporating surface diffusion. The difference in the value of β would reflect the influence of either the electric field or energetic barriers at step edges on the rate of roughness development.
format Articulo
Articulo
author Vela, María Elena
Andreasen, Gustavo
Salvarezza, Roberto Carlos
Hernández Creus, A.
Arvia, Alejandro Jorge
author_facet Vela, María Elena
Andreasen, Gustavo
Salvarezza, Roberto Carlos
Hernández Creus, A.
Arvia, Alejandro Jorge
author_sort Vela, María Elena
title In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics
title_short In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics
title_full In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics
title_fullStr In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics
title_full_unstemmed In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : The roughening kinetics
title_sort in situ sequential stm imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid : the roughening kinetics
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/121346
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