INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Functionalization of carbon surfaces with a dendritic molecule.
Autor/es:
J. I. PAEZ; M.C. STRUMIA; M.C.G. PASSEGGI (JR.); J. FERRÓN; A.M. BARUZZI; V. BRUNETTI
Revista:
ELECTROCHIMICA ACTA
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2009 vol. 54 p. 4192 - 4197
ISSN:
0013-4686
Resumen:
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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. In particular, glassy
carbon and highly ordered pyrolytic graphite electrodes. 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. Film
permeability of 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 modified carbon surface is
also observed.