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>, the potential of zero charge of the sub...
| Authors: | ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 1997 |
| Country: | Argentina |
| Institution: | UNLP |
| Repository: | SEDICI (UNLP) |
| Language: | English |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/85927 |
| Online Access: | http://sedici.unlp.edu.ar/handle/10915/85927 |
| Access Level: | Open access |
| Keyword: | Ciencias Exactas Química Piridinas Oro scanning tunneling microscopy potentiostatic Metales Electroquímica |
| _version_ | 1878403955684278272 |
|---|---|
| author | Andreasen, Gustavo |
| author2 | Vela, María Elena Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author2_role | author author author |
| author_browse | Andreasen, Gustavo Arvia, Alejandro Jorge Salvarezza, Roberto Carlos Vela, María Elena |
| author_facet | Andreasen, Gustavo Vela, María Elena Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_role | author |
| collection | SEDICI (UNLP) |
| 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | AR_dfedd04d076d61ba16095f2c96ced086 |
| institution | UNLP |
| instname_str | Universidad Nacional de La Plata |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:sedici.unlp.edu.ar:10915/85927 |
| publishDate | 1997 |
| publishDateSort | 1997 |
| reponame_str | SEDICI (UNLP) |
| spelling | Dynamics of Pyridine Adsorption on Gold(111) Terraces in Acid Solution from in-Situ Scanning Tunneling Microscopy under Potentiostatic Control Andreasen, Gustavo Vela, María Elena Salvarezza, Roberto Carlos Arvia, Alejandro Jorge Ciencias Exactas Química Piridinas Oro scanning tunneling microscopy potentiostatic Metales Electroquímica 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 http://sedici.unlp.edu.ar/handle/10915/85927 |
| 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 |
| status_str | publishedVersion |
| title | 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_short | 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 |
| topic | Ciencias Exactas Química Piridinas Oro scanning tunneling microscopy potentiostatic Metales Electroquímica |
| topic_facet | Ciencias Exactas Química Piridinas Oro scanning tunneling microscopy potentiostatic Metales Electroquímica |
| url | http://sedici.unlp.edu.ar/handle/10915/85927 |