Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices
A comprehensive description of the self-assembly process of alkanethiols on Au(111) is presented, focused on the initial formation of the lying down phases. Low-coverage monolayers are prepared by the disintegration of Au₁₄₄(RS)₆₀ nanoclusters on the reconstructed (22 × √3)-Au(111) surface. The meth...
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| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2020
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/123966 |
| Aporte de: |
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I19-R120-10915-123966 |
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| 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 self-assembly process of alkanethiols alkanethiols scanning tunneling microscopy interfacial structure |
| spellingShingle |
Ciencias Exactas Química self-assembly process of alkanethiols alkanethiols scanning tunneling microscopy interfacial structure Pensa, Evangelina Laura Azofra Mesa, Luis Miguel Albrecht, Tim Salvarezza, Roberto Carlos Carro, Pilar Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices |
| topic_facet |
Ciencias Exactas Química self-assembly process of alkanethiols alkanethiols scanning tunneling microscopy interfacial structure |
| description |
A comprehensive description of the self-assembly process of alkanethiols on Au(111) is presented, focused on the initial formation of the lying down phases. Low-coverage monolayers are prepared by the disintegration of Au₁₄₄(RS)₆₀ nanoclusters on the reconstructed (22 × √3)-Au(111) surface. The method provides a limited number of thiols together with a large excess of gold adatoms. Scanning tunneling microscopy and density functional theory calculations were employed to study the transition between low to high thiolate coverage phases. The process involves different lattices and surface transformations, including thiyl radicals on the herringbone reconstruction, radicalinduced herringbone lifting, and the formation of energetically similar metastable phases formed by RS-Au-RS moieties. Results also show that the transition is slow, and different surface structures can coexist on the same sample. Along the process, the first source of Au adatoms to form the RS-Au-SR moieties is the lifting of the herringbone reconstruction because of the lower energetic cost to extract the extra Au atom. However, for hexanethiol (and shorter alkanethiols) at low coverage, additional Au adatoms must be taken from terraces leading to vacancy islands. This process can be entirely suppressed by growing the lying down phases in the presence of an excess of Au adatoms. Taken together, our results shed light on the elusive initial steps of thiol adsorption on clean reconstructed Au, showing that the RS-Au-SR staple motif is also present at the interface of low-coverage self-assembled monolayers. |
| format |
Articulo Articulo |
| author |
Pensa, Evangelina Laura Azofra Mesa, Luis Miguel Albrecht, Tim Salvarezza, Roberto Carlos Carro, Pilar |
| author_facet |
Pensa, Evangelina Laura Azofra Mesa, Luis Miguel Albrecht, Tim Salvarezza, Roberto Carlos Carro, Pilar |
| author_sort |
Pensa, Evangelina Laura |
| title |
Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices |
| title_short |
Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices |
| title_full |
Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices |
| title_fullStr |
Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices |
| title_full_unstemmed |
Shedding Light on the Interfacial Structure of Low-Coverage Alkanethiol Lattices |
| title_sort |
shedding light on the interfacial structure of low-coverage alkanethiol lattices |
| publishDate |
2020 |
| url |
http://sedici.unlp.edu.ar/handle/10915/123966 |
| work_keys_str_mv |
AT pensaevangelinalaura sheddinglightontheinterfacialstructureoflowcoveragealkanethiollattices AT azoframesaluismiguel sheddinglightontheinterfacialstructureoflowcoveragealkanethiollattices AT albrechttim sheddinglightontheinterfacialstructureoflowcoveragealkanethiollattices AT salvarezzarobertocarlos sheddinglightontheinterfacialstructureoflowcoveragealkanethiollattices AT carropilar sheddinglightontheinterfacialstructureoflowcoveragealkanethiollattices |
| bdutipo_str |
Repositorios |
| _version_ |
1764820450584559616 |