INVESTIGADORES
PASSEGGI Mario Cesar Guillermo
artículos
Título:
Spontaneous adsorption of 3,5-Bis (3,5-dinitrobenzoylamino) benzoic acid onto carbon
Autor/es:
PÁEZ, J.I.; STRUMIA, M.C.; PASSEGGI (JR.), M.C.G.; FERRÓN, J.; BARUZZI, A.M.; BRUNETTI, V.
Revista:
ELECTROCHIMICA ACTA
Editorial:
Elsevier Science
Referencias:
Lugar: Amsterdam, Holanda; Año: 2009 vol. 54 p. 4192 - 4197
ISSN:
0013-4686
Resumen:
Dendritic molecules contain multifunctional groups that can be used to efficiently control the properties of an electrode surface. We are developing strategies to generate a highly functionalized surface using multifunctional and rigid dendrons immobilized onto different substrates. In the present work, we explore the immobilization of a dendritic molecule: 3,5-Bis (3,5-dinitrobenzoylamino) benzoic acid (D-NO2) onto carbon surfaces showing a simple and rapid way to produce conductive surfaces with electroactive chemical functions. The immobilized D-NO2 layer has been characterized using atomic force microscopy and cyclic voltammetry. D-NO2 adsorbs onto carbon surfaces spontaneously by dipping the electrode in dendron solutions. Reduction of this layer generates the hydroxylamine product. The resulting redox-active layer exhibits a well-behaved redox response for the adsorbed nitroso/hydroxylamine couple. The film permeability of the derivatized surface has been analyzed employing the electrochemical response of redox probes: Ru(NH3)63+/Ru(NH3)62+ and Fe(CN)63-/Fe(CN)64-. Electrocatalytic oxidation of nicotinamide adenine dinucleotide onto a modified carbon surface was also observed.