AFM Imaging of Mercaptobenzoic Acid on Au(110) : Submolecular Contrast with Metal Tips
Hauptmann, Nadine (Radboud University. Institute for Molecules and Materials.)
Robles, Roberto (Institut Català de Nanociència i Nanotecnologia)
Abufager, Paula (Universidad Nacional de Rosario. Instituto de Física de Rosario)
Lorente, Nicolás (Centro de Física de Materiales (San Sebastián. España))
Berndt, Richard (Christian-Albrechts-Universität zu Kiel. Institut für Experimentelle und Angewandte Physik)

Fecha:	2016
Resumen:	A self-assembled monolayer of mercaptobenzoic acid (MBA) on Au(110) is investigated with scanning tunneling and atomic force microscopy (STM and AFM) and density functional calculations. High-resolution AFM images obtained with metallic tips show clear contrasts between oxygen atoms and phenyl moieties. The contrast above the oxygen atoms is due to attractive covalent interactions, which is different than previously reported high-resolution images, where Pauli repulsion dominated the image contrast. We show that the bonding of MBA to the substrate occurs mainly through dispersion interactions, whereas the thiol-Au bond contributes only a quarter of the adsorption energy. No indication of Au adatoms mediating the thiol-Au interaction was found in contrast to other thiol-bonded systems. However, MBA lifts the Au(110)-(2 × 1) reconstruction.
Ayudas:	Ministerio de Economía y Competitividad SEV-2013-0295
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Adsorption energies ; Covalent interactions ; Dispersion interaction ; High resolution ; High resolution image ; Image contrasts ; Mercaptobenzoic acids ; Scanning tunneling and atomic force microscopy
Publicado en:	Journal of physical chemistry letters, Vol. 7, Issue 11 (June 2016) , p. 1984-1990, ISSN 1948-7185

DOI: 10.1021/acs.jpclett.6b00684

Post-print 25 p, 6.7 MB

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