Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres
The topography evolution of a poly(o-toluidine) layer (the object) electrodeposited on a polyfaceted Au single crystal from 0.5 M H<sub>2</sub>SO<sub>4</sub> + 0.65 M o-toluidine aqueous solution at 25 °C has been studied combining nanometer scale ex-situ scanning tunneling m...
| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Español |
| Publicado: |
1994
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/127137 https://pubs.acs.org/doi/abs/10.1021/j100060a032 |
| Aporte de: |
| id |
I19-R120-10915-127137 |
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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 |
Español |
| topic |
Ciencias Exactas Química poly(o-toluidine) scanning tunneling microscopy Gold |
| spellingShingle |
Ciencias Exactas Química poly(o-toluidine) scanning tunneling microscopy Gold Ocón, P. Herrasti, P. Vara, J. M. Vázquez, L. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres |
| topic_facet |
Ciencias Exactas Química poly(o-toluidine) scanning tunneling microscopy Gold |
| description |
The topography evolution of a poly(o-toluidine) layer (the object) electrodeposited on a polyfaceted Au single crystal from 0.5 M H<sub>2</sub>SO<sub>4</sub> + 0.65 M o-toluidine aqueous solution at 25 °C has been studied combining nanometer scale ex-situ scanning tunneling microscopy and electrochemical techniques. A thin polymer layer structure consists of nodular elements following the substrate topography, whereas a thick polymer structure corresponds to a rather disordered structure made up of agglomerates formed by nodular elements with average diameter size d<sub>s</sub> ≅ 15 nm. In contrast to the former one, this structure is independent of the substrate topography. For thick layers ξ, the root-mean-square roughness of the polymer coating, and L<sub>s</sub>, the scan length, fulfill a ξ ∝ L<sup>α</sup> relationship with a = 0.33 ± 0.05 for L<sub>s</sub> > d<sub>s</sub> and α = 0.85 ± 0.05 for L<sub>s</sub> < d<sub>s</sub>- Accordingly, the polymer layer surface behaves as a self-affine fractal. For L<sub>s</sub> < d<sub>s</sub> the value of a agrees with that predicted for moving interfaces generated by the Eden model, whereas for L<sub>s</sub> < d<sub>s</sub> the value of a approaches that expected from an Euclidean surface. The topographic analysis of these polymer layers can be related to the kinetics of electrochemical reactions at polymer-coated Au electrodes. |
| format |
Articulo Articulo |
| author |
Ocón, P. Herrasti, P. Vara, J. M. Vázquez, L. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_facet |
Ocón, P. Herrasti, P. Vara, J. M. Vázquez, L. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_sort |
Ocón, P. |
| title |
Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres |
| title_short |
Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres |
| title_full |
Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres |
| title_fullStr |
Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres |
| title_full_unstemmed |
Scanning Tunneling Microscopy Fractal Characterization of Poly (o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres |
| title_sort |
scanning tunneling microscopy fractal characterization of poly (o-toluidine) films produced electrochemically on polyfaceted gold single crystal spheres |
| publishDate |
1994 |
| url |
http://sedici.unlp.edu.ar/handle/10915/127137 https://pubs.acs.org/doi/abs/10.1021/j100060a032 |
| work_keys_str_mv |
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Repositorios |
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