Fractal characterisation of electrodispersed gold electrodes
The fractal dimension of the surface, D<sub>s</sub>, of thin columnar gold electrodeposits (surface roughness factor 50–100) grown on gold wire cathodes by electroreducing hydrous gold oxide layers has been determined by measuring the diffusion controlled current of the Fe(CN)<sup>...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1991 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/87026 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/87026 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Exactas Química Fractales electrodispersed Oro Electrodos electrodeposits Cationes |
| Sumario: | The fractal dimension of the surface, D<sub>s</sub>, of thin columnar gold electrodeposits (surface roughness factor 50–100) grown on gold wire cathodes by electroreducing hydrous gold oxide layers has been determined by measuring the diffusion controlled current of the Fe(CN)<sup>4−</sup><sub>6</sub>/Fe(CN)<sup>3−</sup><sub>6</sub> reaction. The diffusion current (I) vs. time (t) relationships obeyed a Iαt<sup>−α</sup> dependence with D<sub>s</sub> = 2α + 1. The initial D<sub>s</sub>, value is 2.5 ± 0.1, and decreases to 2.3 ± 0.1 by keeping the deposit in contact with the electrolyte solution at 298 K due to the smoothing of the rough metal surface by surface diffusion. |
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