Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes

In situ scanning tunneling microscopy (STM) is proposed as an option to investigate the electrochemical reactivity of nontrivial systems. For this purpose the controversial electro-oxidation and electro-reduction of thiourea at Au(111) surfaces under potential control and constant temperature are co...

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Autores principales: Azzaroni, Omar, Andreasen, Gustavo, Blum, Bárbara, Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Exactas
Química
scanning tunneling microscopy
nontrivial systems
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127154
https://pubs.acs.org/doi/10.1021/jp993511k
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127154
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
scanning tunneling microscopy
nontrivial systems
spellingShingle Ciencias Exactas
Química
scanning tunneling microscopy
nontrivial systems
Azzaroni, Omar
Andreasen, Gustavo
Blum, Bárbara
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes
topic_facet Ciencias Exactas
Química
scanning tunneling microscopy
nontrivial systems
description In situ scanning tunneling microscopy (STM) is proposed as an option to investigate the electrochemical reactivity of nontrivial systems. For this purpose the controversial electro-oxidation and electro-reduction of thiourea at Au(111) surfaces under potential control and constant temperature are considered. Sequential STM imaging show thiourea adsorption in striped arrays that evolve to a hexagonal close-packed (hcp) structure when the electron surface charge density is decreased. The transient hcp structure is electro-oxidized to formamidine disulfide (FDS) that slowly yields adsorbed sulfur. These results show that STM is a powerful tool to understand the reactivity of adsorbed molecules at conducting surfaces, by sequential imaging at the molecular level.
format Articulo
Articulo
author Azzaroni, Omar
Andreasen, Gustavo
Blum, Bárbara
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Azzaroni, Omar
Andreasen, Gustavo
Blum, Bárbara
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Azzaroni, Omar
title Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes
title_short Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes
title_full Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes
title_fullStr Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes
title_full_unstemmed Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes
title_sort scanning tunneling microscopy studies of the electrochemical reactivity of thiourea on au(111) electrodes
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/127154
https://pubs.acs.org/doi/10.1021/jp993511k
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