Size-Dependent and Step-Modulated Supramolecular Electrochemical Properties of Catechol-Derived Adlayers at Pt(hkl) Surfaces

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Title: Size-Dependent and Step-Modulated Supramolecular Electrochemical Properties of Catechol-Derived Adlayers at Pt(hkl) Surfaces
Authors: Rodríguez López, Margarita | Herrero, Enrique | Climent, Victor | Rodes García, Antonio | Aldaz Riera, Antonio | Feliu, Juan M. | Carrasquillo, Arnaldo Jr.
Research Group/s: Electroquímica de Superficies | Grupo de Espectroelectroquímica y Modelización (GEM) | Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Catechol-derived adlayers | Platinum single crystal electrodes | Electrochemical properties
Knowledge Area: Química Física
Issue Date: 11-Oct-2013
Publisher: American Chemical Society
Citation: Langmuir. 2013, 29(42): 13102-13110. doi:10.1021/la402627e
Abstract: The electrochemical reactivity of catechol-derived adlayers is reported at platinum (Pt) single-crystal electrodes. Pt(111) and stepped vicinal surfaces are used as model surfaces possessing well-ordered nanometer-sized Pt(111) terraces ranging from 0.4 to 12 nm. The electrochemical experiments were designed to probe how the control of monatomic step-density and of atomic-level step structure can be used to modulate molecule–molecule interactions during self-assembly of aromatic-derived organic monolayers at metallic single-crystal electrode surfaces. A hard sphere model of surfaces and a simplified band formation model are used as a theoretical framework for interpretation of experimental results. The experimental results reveal (i) that supramolecular electrochemical effects may be confined, propagated, or modulated by the choice of atomic level crystallographic features (i.e.monatomic steps), deliberately introduced at metallic substrate surfaces, suggesting (ii) that substrate-defect engineering may be used to tune the macroscopic electronic properties of aromatic molecular adlayers and of smaller molecular aggregates.
Sponsor: ACJ and MRL thank support from PCUPR, UPRM, and the Institute of Electrochemistry at University of Alicante through project MICINN (Spain) CTQ2010-16271 and Generalitat Valenciana (project PROMETEO/2009/045, Feder).
URI: http://hdl.handle.net/10045/38752
ISSN: 0743-7463 (Print) | 1520-5827 (Online)
DOI: 10.1021/la402627e
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 American Chemical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1021/la402627e
Appears in Collections:INV - EQSUP - Artículos de Revistas
INV - LEQA - Artículos de Revistas
INV - GEM - Artículos de Revistas

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