Electrochemical STM study of the adsorption of adenine on Au(111) electrodes

Autor: Francisco Prieto-Dapena, Manuela Rueda, María Escudero-Escribano, Cristina Vaz-Domínguez, Angel Cuesta, C. Cerrillos
Přispěvatelé: Universidad de Sevilla. Departamento de Química Física, Ministerio de Ciencia y Tecnología (España), Junta de Andalucía, Consejo Superior de Investigaciones Científicas (España)
Rok vydání: 2013
Předmět:
Zdroj: idUS: Depósito de Investigación de la Universidad de Sevilla
Universidad de Sevilla (US)
idUS. Depósito de Investigación de la Universidad de Sevilla
instname
Digital.CSIC. Repositorio Institucional del CSIC
Electrochemistry Communications, Vol 35, Iss, Pp 61-64 (2013)
ISSN: 1388-2481
DOI: 10.1016/j.elecom.2013.07.045
Popis: 4 pags., 2 figs.
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. © 2013 Elsevier B.V.
Financial support from the Spanish Ministry of Science and Technology (CTQ2009-07017 and CTQ2010-19823) and from the Junta de Andalucia (PAI FQM202) is gratefully acknowledged. C. Vaz-Dominguezacknowledges a JAE Doc Fellowship from CSIC
Databáze: OpenAIRE
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