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
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/85927
Ver los metadatos del registro completo
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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:UNLP2025-10-22T16:57:52Zoai: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:13292025-10-22 16:57:52.968SEDICI (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 |
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1997-12-10 |
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eng |
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