Artículo
Electrochemical STM study of the adsorption of adenine on Au(111) electrodes
Autor/es | Vaz Domínguez, Cristina
Escudero Escribano, María Cuesta, Angel Prieto Dapena, Francisco Cerrillos González, Consuelo Rueda Rueda, Manuela |
Departamento | Universidad de Sevilla. Departamento de Química Física |
Fecha de publicación | 2013 |
Fecha de depósito | 2021-04-15 |
Publicado en |
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Resumen | An electrochemical scanning tunneling microscopy (EC-STM) study of the adsorption of adenine on Au(111) electrodes was undertaken in the pH range between 1 and 7, aiming at achieving a deeper knowledge on the structure and ... An electrochemical scanning tunneling microscopy (EC-STM) study of the adsorption of adenine on Au(111) electrodes was undertaken in the pH range between 1 and 7, aiming at achieving a deeper knowledge on the structure and organization of adenine chemisorbed on gold and at confirming previous conclusions obtained from combined electrochemical and in situ IR spectroscopy measurements. This study confirms that chemisorption of adenine induces the lifting of the Au(111) surface reconstruction. Furthermore, the 4% excess gold atoms of the reconstructed surface, which are expelled during lifting of the reconstruction, do not diffuse away from the reconstruction rows. We observe, in contrast, the formation of nanometric islands arranged forming chains along the directions previously followed by the reconstruction solitons. Chemisorbed adenine adlayers consist of short chains of adenine molecules roughly aligned along the three main crystallographic directions of the substrate and stabilized by π stacking. These chains tend to align parallel to each other, forming very small domains and yielding an adlayer with a very short-range order. The same adlayer structure is observed at all the studied pH values. The STM results also confirm that, in very acidic media, and at low potentials, adenine adsorbs very weakly on the reconstructed Au(111) surface. |
Identificador del proyecto | CTQ2009-07017
CTQ2010-19823 PAI FQM202 |
Cita | Vaz Domínguez, C., Escudero Escribano, M., Cuesta, A., Prieto Dapena, F., Cerrillos González, C. y Rueda Rueda, M. (2013). Electrochemical STM study of the adsorption of adenine on Au(111) electrodes. Electrochemistry Communications, 35, 61-64. |
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