Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control

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>...

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Autores principales: Andreasen, Gustavo, Vela, María Elena, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1997
Materias:
Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85927
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85927
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
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
spellingShingle Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
Andreasen, Gustavo
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
topic_facet Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
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.
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 Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
title_short Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
title_full Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
title_fullStr Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
title_full_unstemmed Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
title_sort dynamics of pyridine adsorption on gold(111) terraces in acid solution from in-situ scanning tunneling microscopy under potentiostatic control
publishDate 1997
url http://sedici.unlp.edu.ar/handle/10915/85927
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bdutipo_str Repositorios
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