The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite

Gold electrodeposition on C(0001) from aqueous 0.5 mM AuCl<sub>3</sub>·HCl, in the range of apparent charge density (6 ≤ q ≤ 10 mC/cm<sup>2</sup>) and under mass transport kinetic control from the solution side, results in the formation of nanometer to micrometer size Au(111)...

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Detalles Bibliográficos
Autores principales: Martín, H., Carro, P., Hernández Creus, A., González, S., Andreasen, Gustavo, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Exactas
Química
Gold electrodeposition
Scanning tunneling microscopy
Citric acid
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121351
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121351
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
Gold electrodeposition
Scanning tunneling microscopy
Citric acid
spellingShingle Ciencias Exactas
Química
Gold electrodeposition
Scanning tunneling microscopy
Citric acid
Martín, H.
Carro, P.
Hernández Creus, A.
González, S.
Andreasen, Gustavo
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite
topic_facet Ciencias Exactas
Química
Gold electrodeposition
Scanning tunneling microscopy
Citric acid
description Gold electrodeposition on C(0001) from aqueous 0.5 mM AuCl<sub>3</sub>·HCl, in the range of apparent charge density (6 ≤ q ≤ 10 mC/cm<sup>2</sup>) and under mass transport kinetic control from the solution side, results in the formation of nanometer to micrometer size Au(111) islands. These islands consist of a small three-dimensional (3D) central core and large quasi-two-dimensional (2D) dendritic branches. Ex situ scanning tunneling microscopy (STM) imaging data show that the shape of islands is determined by anisotropic surface diffusion contributions. The addition of citric acid to the plating solution hinders branching and promotes 3D island growth. The adsorption of citric acid at step edges hinders interterrace gold atom surface diffusion, as concluded from in situ STM imaging. Conversely, the addition of an excess of sodium chloride enhances 2D island growth and dense branching formation. These results can be explained considering that the presence of adsorbates either increases or decreases the height of activation energy barriers for interterrace surface diffusion. In this way, the change of the island aspect ratio with the nature of the additive can be explained.
format Articulo
Articulo
author Martín, H.
Carro, P.
Hernández Creus, A.
González, S.
Andreasen, Gustavo
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Martín, H.
Carro, P.
Hernández Creus, A.
González, S.
Andreasen, Gustavo
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Martín, H.
title The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite
title_short The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite
title_full The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite
title_fullStr The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite
title_full_unstemmed The Influence of Adsorbates on the Growth Mode of Gold Islands Electrodeposited on the Basal Plane of Graphite
title_sort influence of adsorbates on the growth mode of gold islands electrodeposited on the basal plane of graphite
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/121351
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