Catálogo de Investigaciones | 2013-2014

FACULTAD 152 Size-Dependent and Step-Modulated Supramolecular Electrochemical Properties of Catechol-Derived Adlayers at Pt(hkl) Surfaces The electrochemical reactivity of catechol-derived adlayers is report 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-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 smaller molecular aggregates. webpage: http://pubs.acs.org/doi/ipdf/10.1021/la402627e dra. margarita rodríguez lópez colegio de ciencias enrique herrero víctor climent antonio rodes antonio aldaz universidad de alicante juan m. feliú arnaldo carrasquillo universidad de puerto rico electrochemistry surface-science adsorption quinones