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Pensa, E.; Vericat, C.; Grumelli, D.; Salvarezza, R.C.; Park, S.H.; Longo, G.S.; Szleifer, I.; Méndez De Leo, L.P. "New insight into the electrochemical desorption of alkanethiol SAMs on gold" (2012) Physical Chemistry Chemical Physics. 14(35):12355-12367
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Abstract:

A combination of Polarization Modulation Infrared Reflection Absorption Spectroscopy (PMIRRAS) under electrochemical control, Electrochemical Scanning Tunneling Microscopy (ECSTM) and Molecular Dynamics (MD) simulations has been used to shed light on the reductive desorption process of dodecanethiol (C12) and octadecanethiol (C18) SAMs on gold in aqueous electrolytes. Experimental PMIRRAS, ECSTM and MD simulations data for C12 desorption are consistent with formation of randomly distributed micellar aggregates stabilized by Na + ions, coexisting with a lying-down phase of molecules. The analysis of pit and Au island coverage before and after desorption is consistent with the thiolate-Au adatoms models. On the other hand, PMIRRAS and MD data for C18 indicate that the desorbed alkanethiolates adopt a Na+ ion-stabilized bilayer of interdigitated alkanethiolates, with no evidence of lying down molecules. MD simulations also show that both the degree of order and tilt angle of the desorbed alkanethiolates change with the surface charge on the metal, going from bilayers to micelles. These results demonstrate the complexity of the alkanethiol desorption in the presence of water and the fact that chain length and counterions play a key role in a complex structure. © This journal is the Owner Societies 2012.

Registro:

Documento: Artículo
Título:New insight into the electrochemical desorption of alkanethiol SAMs on gold
Autor:Pensa, E.; Vericat, C.; Grumelli, D.; Salvarezza, R.C.; Park, S.H.; Longo, G.S.; Szleifer, I.; Méndez De Leo, L.P.
Filiación:Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA - CONICET), 1900 La Plata, Buenos Aires, Argentina
Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, United States
Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, United States
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
INQUIMAE, CONICET, Ciudad Universitaria Pabellón II, Buenos Aires, Argentina
Palabras clave:alkane; gold; thiol derivative; water; adsorption; article; chemistry; electrochemical analysis; molecular dynamics; surface property; Adsorption; Alkanes; Electrochemical Techniques; Gold; Molecular Dynamics Simulation; Sulfhydryl Compounds; Surface Properties; Water
Año:2012
Volumen:14
Número:35
Página de inicio:12355
Página de fin:12367
DOI: http://dx.doi.org/10.1039/c2cp41291h
Título revista:Physical Chemistry Chemical Physics
Título revista abreviado:Phys. Chem. Chem. Phys.
ISSN:14639076
CODEN:PPCPF
CAS:gold, 7440-57-5; thiol derivative, 13940-21-1; water, 7732-18-5; Alkanes; Gold, 7440-57-5; Sulfhydryl Compounds; Water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v14_n35_p12355_Pensa

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Citas:

---------- APA ----------
Pensa, E., Vericat, C., Grumelli, D., Salvarezza, R.C., Park, S.H., Longo, G.S., Szleifer, I.,..., Méndez De Leo, L.P. (2012) . New insight into the electrochemical desorption of alkanethiol SAMs on gold. Physical Chemistry Chemical Physics, 14(35), 12355-12367.
http://dx.doi.org/10.1039/c2cp41291h
---------- CHICAGO ----------
Pensa, E., Vericat, C., Grumelli, D., Salvarezza, R.C., Park, S.H., Longo, G.S., et al. "New insight into the electrochemical desorption of alkanethiol SAMs on gold" . Physical Chemistry Chemical Physics 14, no. 35 (2012) : 12355-12367.
http://dx.doi.org/10.1039/c2cp41291h
---------- MLA ----------
Pensa, E., Vericat, C., Grumelli, D., Salvarezza, R.C., Park, S.H., Longo, G.S., et al. "New insight into the electrochemical desorption of alkanethiol SAMs on gold" . Physical Chemistry Chemical Physics, vol. 14, no. 35, 2012, pp. 12355-12367.
http://dx.doi.org/10.1039/c2cp41291h
---------- VANCOUVER ----------
Pensa, E., Vericat, C., Grumelli, D., Salvarezza, R.C., Park, S.H., Longo, G.S., et al. New insight into the electrochemical desorption of alkanethiol SAMs on gold. Phys. Chem. Chem. Phys. 2012;14(35):12355-12367.
http://dx.doi.org/10.1039/c2cp41291h