A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy

The surfaces of Au deposits grown under non-equilibrium conditions from either the electroreduction of Au oxide or from the vapour have been analysed as fractals by measuring the perimeter (P) and the area (A) of intergranular voids. The values of P and A were determined from scanning tunnelling mic...

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Detalles Bibliográficos
Autores principales: Herrasti, P., Ocón, P., Salvarezza, Roberto Carlos, Vara, J. M., Vásquez, L., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1992
Materias:
Ciencias Exactas
Química
Fractal surfaces
Scanning tunneling microscopy
Electrocrystallization
Metal vapour deposition
Gold electrodes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/118415
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-118415
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
Fractal surfaces
Scanning tunneling microscopy
Electrocrystallization
Metal vapour deposition
Gold electrodes
spellingShingle Ciencias Exactas
Química
Fractal surfaces
Scanning tunneling microscopy
Electrocrystallization
Metal vapour deposition
Gold electrodes
Herrasti, P.
Ocón, P.
Salvarezza, Roberto Carlos
Vara, J. M.
Vásquez, L.
Arvia, Alejandro Jorge
A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy
topic_facet Ciencias Exactas
Química
Fractal surfaces
Scanning tunneling microscopy
Electrocrystallization
Metal vapour deposition
Gold electrodes
description The surfaces of Au deposits grown under non-equilibrium conditions from either the electroreduction of Au oxide or from the vapour have been analysed as fractals by measuring the perimeter (P) and the area (A) of intergranular voids. The values of P and A were determined from scanning tunnelling microscopy (STM) topographic imaging of the deposit surfaces. A frsctal behaviour P ∝ 4 <sup>D/2</sup> was found with D = 1.5 ± 0.1 and D = 1.7 ± 0.1 for the electrodeposited and vapour deposited Au iilms, respectively. These figures remain constant for film thicknesses between 100 and 1000 mn. The value of D, the fractal dimension of the surfaces, is 2.5 ± 0.1 for the Au electrodeposits, and 2.7 + 0.1 for the Au vapour deposited films. The former value is consistent with either a diffusion or an electric field controlled growth model, whereas the latter is in agreement with a ballistic growth model.
format Articulo
Articulo
author Herrasti, P.
Ocón, P.
Salvarezza, Roberto Carlos
Vara, J. M.
Vásquez, L.
Arvia, Alejandro Jorge
author_facet Herrasti, P.
Ocón, P.
Salvarezza, Roberto Carlos
Vara, J. M.
Vásquez, L.
Arvia, Alejandro Jorge
author_sort Herrasti, P.
title A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy
title_short A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy
title_full A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy
title_fullStr A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy
title_full_unstemmed A comparative study of electrodeposited and vapour deposited gold films : Fractal surface characterization through scanning tunnelling microscopy
title_sort comparative study of electrodeposited and vapour deposited gold films : fractal surface characterization through scanning tunnelling microscopy
publishDate 1992
url http://sedici.unlp.edu.ar/handle/10915/118415
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