A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass

The electrodeposition of Ni on β-brass from Watt's bath was studied by using electrochemical techniques, scanning tunneling microscopy (STM) imaging, and X-ray diffraction. As the electrodeposition current density j was increased from 0.01 to 0.25 A cm<sup>-2</sup>, both the Ni crys...

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Detalles Bibliográficos
Autores principales: Morales, J., Krijer, S. M., Esparza, P., González, S., Vázquez, L., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1996
Materias:
Ciencias Exactas
Química
Ni
β-brass
Scanning tunneling microscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/119342
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-119342
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
Ni
β-brass
Scanning tunneling microscopy
spellingShingle Ciencias Exactas
Química
Ni
β-brass
Scanning tunneling microscopy
Morales, J.
Krijer, S. M.
Esparza, P.
González, S.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass
topic_facet Ciencias Exactas
Química
Ni
β-brass
Scanning tunneling microscopy
description The electrodeposition of Ni on β-brass from Watt's bath was studied by using electrochemical techniques, scanning tunneling microscopy (STM) imaging, and X-ray diffraction. As the electrodeposition current density j was increased from 0.01 to 0.25 A cm<sup>-2</sup>, both the Ni crystal size (d) and the root mean square roughness of the deposit (ξ) decreased. For j > 0.25 A cm<sup>-2</sup> the deposit became rougher due to the growth of large Ni crystals over a background of small Ni crystals. This change in the growth mode appears as a transition in the value of ξ which is promoted by strongly adsorbed intermediates involved in the discharge of Ni<sup>2+</sup> ions. The analysis of the dynamic and static roughening exponents resulting from the application of the dynamic scaling theory to the STM images of Ni deposits indicates that the growth of Ni at high current density, i.e. far from the thermodynamic equilibrium, can be described as an aggregation process with a significant contribution of Ni atom surface diffusion.
format Articulo
Articulo
author Morales, J.
Krijer, S. M.
Esparza, P.
González, S.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Morales, J.
Krijer, S. M.
Esparza, P.
González, S.
Vázquez, L.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Morales, J.
title A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass
title_short A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass
title_full A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass
title_fullStr A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass
title_full_unstemmed A Combined Scanning Tunneling Microscopy and Electrochemical Study of Nickel Electrodeposition on β-Brass
title_sort combined scanning tunneling microscopy and electrochemical study of nickel electrodeposition on β-brass
publishDate 1996
url http://sedici.unlp.edu.ar/handle/10915/119342
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