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:
<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:ES; mso-fareast-language:ES;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:35.4pt; mso-footer-margin:35.4pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> 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.