Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces
In this work, the electrochemical formation of alkanethiolate self-assembled monolayers (SAMs) on Ni(111) and polycrystalline Ni surfaces from alkanethiol-containing aqueous 1 M NaOH solutions was studied by combining Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), electro...
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2005
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/159813 |
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I19-R120-10915-1598132023-11-06T20:07:22Z http://sedici.unlp.edu.ar/handle/10915/159813 Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces Bengió, Silvina Fonticelli, Mariano Hernán Benitez, Guillermo Alfredo Hernández Creus, Alberto Carro, Pilar Ascolani, Hugo Zampieri, Guillermo Blum, Bárbara Salvarezza, Roberto Carlos 2005 2023-11-06T14:36:44Z en Ciencias Exactas Química alcohols electrodes gold oxides self organization In this work, the electrochemical formation of alkanethiolate self-assembled monolayers (SAMs) on Ni(111) and polycrystalline Ni surfaces from alkanethiol-containing aqueous 1 M NaOH solutions was studied by combining Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), electrochemical techniques, and density functional theory (DFT) calculations. Results show that alkanethiolates adsorb on Ni concurrent with NiO electroreduction. The resulting surface coverage depends on the applied potential and hydrocarbon chain length. Electrochemical and XPS data reveal that alkanethiolate electroadsorption at room temperature takes place without S-C bond scission, in contrast to previous results from gas-phase adsorption. A complete and dense monolayer, which is stable even at very high cathodic potentials (-1.5 V vs SCE), is formed for dodecanethiol. DFT calculations show that the greater stability against electrodesorption found for alkanethiolate SAMs on Ni, with respect to SAMs on Au, is somewhat related to the larger alkanethiolate adsorption energy but is mainly due to the larger barrier to interfacial electron transfer present in alkanethiolate-covered Ni. A direct consequence of this work is the possibility of using electrochemical self-assembly as a straightforward route to build stable SAMs of long-chained alkanethiolates on Ni surfaces at room temperature. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) application/pdf 23450-23460 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Química alcohols electrodes gold oxides self organization |
| spellingShingle |
Ciencias Exactas Química alcohols electrodes gold oxides self organization Bengió, Silvina Fonticelli, Mariano Hernán Benitez, Guillermo Alfredo Hernández Creus, Alberto Carro, Pilar Ascolani, Hugo Zampieri, Guillermo Blum, Bárbara Salvarezza, Roberto Carlos Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces |
| topic_facet |
Ciencias Exactas Química alcohols electrodes gold oxides self organization |
| description |
In this work, the electrochemical formation of alkanethiolate self-assembled monolayers (SAMs) on Ni(111) and polycrystalline Ni surfaces from alkanethiol-containing aqueous 1 M NaOH solutions was studied by combining Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), electrochemical techniques, and density functional theory (DFT) calculations. Results show that alkanethiolates adsorb on Ni concurrent with NiO electroreduction. The resulting surface coverage depends on the applied potential and hydrocarbon chain length. Electrochemical and XPS data reveal that alkanethiolate electroadsorption at room temperature takes place without S-C bond scission, in contrast to previous results from gas-phase adsorption. A complete and dense monolayer, which is stable even at very high cathodic potentials (-1.5 V vs SCE), is formed for dodecanethiol. DFT calculations show that the greater stability against electrodesorption found for alkanethiolate SAMs on Ni, with respect to SAMs on Au, is somewhat related to the larger alkanethiolate adsorption energy but is mainly due to the larger barrier to interfacial electron transfer present in alkanethiolate-covered Ni. A direct consequence of this work is the possibility of using electrochemical self-assembly as a straightforward route to build stable SAMs of long-chained alkanethiolates on Ni surfaces at room temperature. |
| format |
Articulo Articulo |
| author |
Bengió, Silvina Fonticelli, Mariano Hernán Benitez, Guillermo Alfredo Hernández Creus, Alberto Carro, Pilar Ascolani, Hugo Zampieri, Guillermo Blum, Bárbara Salvarezza, Roberto Carlos |
| author_facet |
Bengió, Silvina Fonticelli, Mariano Hernán Benitez, Guillermo Alfredo Hernández Creus, Alberto Carro, Pilar Ascolani, Hugo Zampieri, Guillermo Blum, Bárbara Salvarezza, Roberto Carlos |
| author_sort |
Bengió, Silvina |
| title |
Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces |
| title_short |
Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces |
| title_full |
Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces |
| title_fullStr |
Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces |
| title_full_unstemmed |
Electrochemical Self-Assembly of Alkanethiolate Molecules on Ni(111) and Polycrystalline Ni Surfaces |
| title_sort |
electrochemical self-assembly of alkanethiolate molecules on ni(111) and polycrystalline ni surfaces |
| publishDate |
2005 |
| url |
http://sedici.unlp.edu.ar/handle/10915/159813 |
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