Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging

The dynamics of 1-dodecanethiol self-assembled monolayers (SAMs) on Au(111) produced by contacting pure thiol was followed by in situ STM at 298 K. Initially, these SAMs constituted a heterogeneous surface consisting of disordered and ordered adsorbate domains at terraces, step edges and pits, formi...

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Autores principales: Terán Arce, Fernando, Vela, María Elena, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1998
Materias:
Ciencias Exactas
Química
Adsorbate STM imaging on Au(111)
1-dodecanethiol adsorbate structure
SAMs dynamics
Clustering theory application
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/118197
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-118197
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
Adsorbate STM imaging on Au(111)
1-dodecanethiol adsorbate structure
SAMs dynamics
Clustering theory application
spellingShingle Ciencias Exactas
Química
Adsorbate STM imaging on Au(111)
1-dodecanethiol adsorbate structure
SAMs dynamics
Clustering theory application
Terán Arce, Fernando
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
topic_facet Ciencias Exactas
Química
Adsorbate STM imaging on Au(111)
1-dodecanethiol adsorbate structure
SAMs dynamics
Clustering theory application
description The dynamics of 1-dodecanethiol self-assembled monolayers (SAMs) on Au(111) produced by contacting pure thiol was followed by in situ STM at 298 K. Initially, these SAMs constituted a heterogeneous surface consisting of disordered and ordered adsorbate domains at terraces, step edges and pits, forming a p(6 x 1) superlattice which later changed to the (√3 x √3)R30° structure. Subsequently, the c(4 x 2) superlattice was also observed. Surface dynamics involves the coalescence and Ostwald ripening phenomena at pits occurring simultaneously with adsorbate ordering at different surface domains. The difference in surface mobility between adsorbate-free and 1- dodecanethiol-covered Au(111) can be explained taking into account both gold lattice relaxation due to adsorption and alkyl chain interaction at SAM. Data analysis in terms of clustering theory allowed us to conclude that a single mechanism is likely involved in the overall surface phenomena in which the mass transport is either a nonsteady state surface diffusion or an interface transfer along step edges as rate-determining step.
format Articulo
Articulo
author Terán Arce, Fernando
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Terán Arce, Fernando
Vela, María Elena
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Terán Arce, Fernando
title Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
title_short Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
title_full Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
title_fullStr Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
title_full_unstemmed Dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
title_sort dynamic characteristics of adsorbed monolayers of 1-dodecanethiol on gold (111) terraces from in-situ scanning tunneling microscopy imaging
publishDate 1998
url http://sedici.unlp.edu.ar/handle/10915/118197
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