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

Autores
Andreasen, Gustavo; Vela, María Elena; Salvarezza, Roberto Carlos; Arvia, Alejandro Jorge
Año de publicación
1997
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The adsorption of pyridine (Py) on Au(111) terraces produced from aqueous 0.1 M HClO4 + 10-3 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 ≥ Epzc, 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 < Epzc, but it is recovered several minutes after stepping E backward to E > Epzc, 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 × 10-9 mol/cm2, 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.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Facultad de Ciencias Exactas
Materia
Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/85927

id SEDICI_dfedd04d076d61ba16095f2c96ced086
oai_identifier_str oai:sedici.unlp.edu.ar:10915/85927
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic ControlAndreasen, GustavoVela, María ElenaSalvarezza, Roberto CarlosArvia, Alejandro JorgeCiencias ExactasQuímicaPiridinasOroscanning tunneling microscopypotentiostaticMetalesElectroquímicaThe 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.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exactas1997-12-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf6814-6819http://sedici.unlp.edu.ar/handle/10915/85927enginfo:eu-repo/semantics/altIdentifier/issn/0743-7463info:eu-repo/semantics/altIdentifier/doi/10.1021/la970417rinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:17:04Zoai:sedici.unlp.edu.ar:10915/85927Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:17:04.442SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
title Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
spellingShingle Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control
Andreasen, Gustavo
Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
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
dc.creator.none.fl_str_mv Andreasen, Gustavo
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author Andreasen, Gustavo
author_facet Andreasen, Gustavo
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_role author
author2 Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
topic Ciencias Exactas
Química
Piridinas
Oro
scanning tunneling microscopy
potentiostatic
Metales
Electroquímica
dc.description.none.fl_txt_mv 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.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Facultad de Ciencias Exactas
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.
publishDate 1997
dc.date.none.fl_str_mv 1997-12-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/85927
url http://sedici.unlp.edu.ar/handle/10915/85927
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0743-7463
info:eu-repo/semantics/altIdentifier/doi/10.1021/la970417r
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
6814-6819
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
_version_ 1844616043457150976
score 13.070432