Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM

The electrodeposition of gold on highly oriented pyrolytic graphite (HOPG) from acid aqueous solutions was studied by using electrochemical techniques complemented with ex-situ scanning tunneling microscopy (STM). The kinetics of gold electrodeposition is consistent with a nucleation and three-dimen...

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Detalles Bibliográficos
Autores principales: Martín, H., Carro, P., Hernández Creus, A., González, S., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1997
Materias:
Ciencias Exactas
Química
isotropic
anisotropic
electrodeposition
Oro
highly oriented pyrolytic graphite
HOPG
scanning tunneling microscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/80816
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-80816
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
isotropic
anisotropic
electrodeposition
Oro
highly oriented pyrolytic graphite
HOPG
scanning tunneling microscopy
spellingShingle Ciencias Exactas
Química
isotropic
anisotropic
electrodeposition
Oro
highly oriented pyrolytic graphite
HOPG
scanning tunneling microscopy
Martín, H.
Carro, P.
Hernández Creus, A.
González, S.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM
topic_facet Ciencias Exactas
Química
isotropic
anisotropic
electrodeposition
Oro
highly oriented pyrolytic graphite
HOPG
scanning tunneling microscopy
description The electrodeposition of gold on highly oriented pyrolytic graphite (HOPG) from acid aqueous solutions was studied by using electrochemical techniques complemented with ex-situ scanning tunneling microscopy (STM). The kinetics of gold electrodeposition is consistent with a nucleation and three-dimensional growth process under diffusion control from the solution side. As the applied potential moves in the negative direction, the gold crystal density increases, and the crystal shape changes from a Euclidean to a dendritic fractal morphology. This transition can be assigned to the anisotropic surface diffusion of gold adatoms induced by the applied electric potential. A model including a potential-dependent energy barrier at step edges accounts for the morphology transition for gold electrodeposition on HOPG.
format Articulo
Articulo
author Martín, H.
Carro, P.
Hernández Creus, A.
González, S.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Martín, H.
Carro, P.
Hernández Creus, A.
González, S.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Martín, H.
title Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM
title_short Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM
title_full Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM
title_fullStr Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM
title_full_unstemmed Growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. Gold electrodeposition on HOPG followed by STM
title_sort growth mode transition involving a potential-dependent isotropic to anisotropic surface atom diffusion change. gold electrodeposition on hopg followed by stm
publishDate 1997
url http://sedici.unlp.edu.ar/handle/10915/80816
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