dc.creatorAndreasen, Gustavo
dc.creatorVela, María Elena
dc.creatorSalvarezza, Roberto Carlos
dc.creatorArvia, Alejandro Jorge
dc.date1997-12-10
dc.date2019-11-22T12:10:27Z
dc.date.accessioned2023-07-14T17:36:08Z
dc.date.available2023-07-14T17:36:08Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/85927
dc.identifierissn:0743-7463
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7428114
dc.descriptionThe 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.descriptionInstituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
dc.descriptionFacultad de Ciencias Exactas
dc.formatapplication/pdf
dc.format6814-6819
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectCiencias Exactas
dc.subjectQuímica
dc.subjectPiridinas
dc.subjectOro
dc.subjectscanning tunneling microscopy
dc.subjectpotentiostatic
dc.subjectMetales
dc.subjectElectroquímica
dc.titleDynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
dc.typeArticulo
dc.typeArticulo


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