Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging

dc.creatorAndreasen, Gustavo
dc.creatorVela, María Elena
dc.creatorSalvarezza, Roberto Carlos
dc.creatorArvia, Alejandro Jorge
dc.date1999
dc.date2021-05-04T15:39:27Z
dc.date.accessioned2023-07-15T01:35:52Z
dc.date.available2023-07-15T01:35:52Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/118286
dc.identifierissn:1572-6657
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7458854
dc.descriptionThe adsorption and desorption of pyridine (Py) adlayers prepared on Au(111) terraces were studied by in-situ scanning tunnelling microscopy (STM) and conventional voltammetry using an aqueous 0.1 M HClO<sub>4</sub>+10<sup>−4</sup> M Py solution at 298 K. The applied potential covered the range 0.15 V < E < 1.2 V (vs. SHE), i.e. potentials above and below E<sub>pzc</sub>, the potential of zero charge of Au(111). In the range E<sub>pzc</sub> < E < 0.96 V, hexagonal (4×4) ordered domains corresponding to Py molecules adsorbed vertically on the Au(111) surface coexist with disordered adlayer domains, but for E < E<sub>pzc</sub>, the ordered adlayer structure disappears leaving uncovered Au(111) domains. Similarly, for E > 0.96 V, the (4×4) adlayer lattice is removed completely leading to a bare Au(111) surface. By stepping E backwards to a value in the range E<sub>pzc</sub> < E < 0.96 V, the readsorption of Py takes place and the (4×4) adlayer domains are recovered in a few minutes. STM data offer the possibility of discussing anion adsorption and the early electroformation stages of the OH-containing adlayer on Au(111) terraces.
dc.descriptionInstituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
dc.formatapplication/pdf
dc.format230–237
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.subjectScanning tunnelling microscopy
dc.subjectElectric potential
dc.subjectPyridine adlayers
dc.subjectAu(111) terraces
dc.titleInfluence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
dc.typeArticulo
dc.typeArticulo


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