| dc.creator | Andreasen, Gustavo | |
| dc.creator | Vela, María Elena | |
| dc.creator | Salvarezza, Roberto Carlos | |
| dc.creator | Arvia, Alejandro Jorge | |
| dc.date | 1997-12-10 | |
| dc.date | 2019-11-22T12:10:27Z | |
| dc.date.accessioned | 2023-07-14T17:36:08Z | |
| dc.date.available | 2023-07-14T17:36:08Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/85927 | |
| dc.identifier | issn:0743-7463 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7428114 | |
| dc.description | The adsorption of pyridine (Py) on Au(111) terraces produced from aqueous 0.1 M HClO<sub>4</sub> + 10-<sup>3</sup> M Py at 298 K was studied in the potential range 0.15 V < E < 0.55 V (vs SHE) by in-situ scanning tunneling microscopy. When E ≥ E<sub>pzc</sub>, the potential of zero charge of the substrate, both ordered and disordered domains can be observed. Ordered domains correspond to vertically adsorbed Py molecules forming a (4 × 4) hexagonal lattice with the nearest neighbor distance d = 0.38 nm, and corrugation z = 0.04 nm. The ordered adsorbate structure disappears for E < E<sub>pzc</sub>, but it is recovered several minutes after stepping E backward to E > E<sub>pzc</sub>, as expected for a reversible potential-step-induced surface process. The surface concentration of adsorbed Py molecules resulting from the (4 × 4) lattice is close to 1 × 10-<sup>9</sup> mol/cm<sup>2</sup>, a figure exceeding the average integral surface concentration value obtained from electroadsorption measurements. Therefore, disordered domains would be related to a mobile diluted Py adsorbate coexisting with ordered Py adsorbate domains leading to a nonhomogeneous Py adsorbate layer at the positively charged Au(111) terraces. | |
| dc.description | Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas | |
| dc.description | Facultad de Ciencias Exactas | |
| dc.format | application/pdf | |
| dc.format | 6814-6819 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Ciencias Exactas | |
| dc.subject | Química | |
| dc.subject | Piridinas | |
| dc.subject | Oro | |
| dc.subject | scanning tunneling microscopy | |
| dc.subject | potentiostatic | |
| dc.subject | Metales | |
| dc.subject | Electroquímica | |
| dc.title | Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control | |
| dc.type | Articulo | |
| dc.type | Articulo | |
