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

The 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...

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Autores principales: Andreasen, Gustavo, Vela, María Elena, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1999
Materias:
Ciencias Exactas
Química
Scanning tunnelling microscopy
Electric potential
Pyridine adlayers
Au(111) terraces
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/118286
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-118286
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
Scanning tunnelling microscopy
Electric potential
Pyridine adlayers
Au(111) terraces
spellingShingle Ciencias Exactas
Química
Scanning tunnelling microscopy
Electric potential
Pyridine adlayers
Au(111) terraces
Andreasen, Gustavo
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
topic_facet Ciencias Exactas
Química
Scanning tunnelling microscopy
Electric potential
Pyridine adlayers
Au(111) terraces
description The 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.
format Articulo
Articulo
author Andreasen, Gustavo
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Andreasen, Gustavo
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Andreasen, Gustavo
title Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
title_short Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
title_full Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
title_fullStr Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
title_full_unstemmed Influence of the electric potential on the structure of pyridine adlayers on Au(111) terraces from in-situ scanning tunnelling microscopy imaging
title_sort influence of the electric potential on the structure of pyridine adlayers on au(111) terraces from in-situ scanning tunnelling microscopy imaging
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/118286
work_keys_str_mv AT andreasengustavo influenceoftheelectricpotentialonthestructureofpyridineadlayersonau111terracesfrominsituscanningtunnellingmicroscopyimaging
AT velamariaelena influenceoftheelectricpotentialonthestructureofpyridineadlayersonau111terracesfrominsituscanningtunnellingmicroscopyimaging
AT salvarezzarobertocarlos influenceoftheelectricpotentialonthestructureofpyridineadlayersonau111terracesfrominsituscanningtunnellingmicroscopyimaging
AT arviaalejandrojorge influenceoftheelectricpotentialonthestructureofpyridineadlayersonau111terracesfrominsituscanningtunnellingmicroscopyimaging
bdutipo_str Repositorios
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