STM-SEM and impedance characterization of columnar structured gold electrodes
The impedance spectra of thin gold electrodeposits with 10<sup>−6</sup>−10<sup>−5</sup> cm average columnar radius and 4×10<sup>−6</sup>−3×10<sup>−4</sup> cm average height have been measured in acid solutions. Frequency dispersion has been observed fo...
| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1991
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/122609 https://www.sciencedirect.com/science/article/abs/pii/002207289185008D#! |
| Aporte de: |
| id |
I19-R120-10915-122609 |
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| 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 Impedance Gold electrodes |
| spellingShingle |
Ciencias Exactas Química Impedance Gold electrodes Gómez, M. M. Vázquez, L. Salvarezza, Roberto Carlos Vara, J. M. Arvia, Alejandro Jorge STM-SEM and impedance characterization of columnar structured gold electrodes |
| topic_facet |
Ciencias Exactas Química Impedance Gold electrodes |
| description |
The impedance spectra of thin gold electrodeposits with 10<sup>−6</sup>−10<sup>−5</sup> cm average columnar radius and 4×10<sup>−6</sup>−3×10<sup>−4</sup> cm average height have been measured in acid solutions. Frequency dispersion has been observed for film thicknesses greater than 3 × 10<sup>−5</sup> cm and electrolyte resistivities larger than 300 Ω cm<sup>−1</sup>. STM-SEM observations reveal a self-affine surface structure with a size distribution of pores ranging from 10<sup>−6</sup> to 10<sup>−4</sup> cm between the columnar elements. In diluted solutions the contribution of the smallest pores to the sampled electrode area decreases as ω increases explaining the observed frequency dispersion. This result confirms that self-affine surfaces exhibit a fractional-power-law impedance. However, no simple correlation was found between the α value and the D value of the self-affine surface measured by an independent method. The present results also show that the electrolyte resistivity plays a certain role in determining the α value. |
| format |
Articulo Articulo |
| author |
Gómez, M. M. Vázquez, L. Salvarezza, Roberto Carlos Vara, J. M. Arvia, Alejandro Jorge |
| author_facet |
Gómez, M. M. Vázquez, L. Salvarezza, Roberto Carlos Vara, J. M. Arvia, Alejandro Jorge |
| author_sort |
Gómez, M. M. |
| title |
STM-SEM and impedance characterization of columnar structured gold electrodes |
| title_short |
STM-SEM and impedance characterization of columnar structured gold electrodes |
| title_full |
STM-SEM and impedance characterization of columnar structured gold electrodes |
| title_fullStr |
STM-SEM and impedance characterization of columnar structured gold electrodes |
| title_full_unstemmed |
STM-SEM and impedance characterization of columnar structured gold electrodes |
| title_sort |
stm-sem and impedance characterization of columnar structured gold electrodes |
| publishDate |
1991 |
| url |
http://sedici.unlp.edu.ar/handle/10915/122609 https://www.sciencedirect.com/science/article/abs/pii/002207289185008D#! |
| work_keys_str_mv |
AT gomezmm stmsemandimpedancecharacterizationofcolumnarstructuredgoldelectrodes AT vazquezl stmsemandimpedancecharacterizationofcolumnarstructuredgoldelectrodes AT salvarezzarobertocarlos stmsemandimpedancecharacterizationofcolumnarstructuredgoldelectrodes AT varajm stmsemandimpedancecharacterizationofcolumnarstructuredgoldelectrodes AT arviaalejandrojorge stmsemandimpedancecharacterizationofcolumnarstructuredgoldelectrodes |
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Repositorios |
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