Artículo de revista
Tailoring electroactive surfaces by non template molecular assembly. Towards electrooxidation of L-cysteine
Fecha
2017Registro en:
Electrochimica Acta 254 (2017) 201–213
Autor
Santander Nelli, Mireya
Silva, Carlos P.
Espinoza Vergara, Javier
Silva, Juan F.
Olguín, Camila F.
Cortés Arriagada, Diego
Zagal Moya, José H.
Mendizábal Emaldía, Fernando
Díez Pérez, Ismael
Pavez, Jorge
Institución
Resumen
We have prepared a nanoelectrode ensemble containing vertically aligned single walled carbon
nanotubes (SWCNTs) using a non-template molecular self-assembling strategy. We used a bottom-up
construction approach to assemble amino functionalized SWCNTs (af-SWCNTs) in a well-defined
architecture. These af-SWCNTs were linked and vertically aligned to pre-formed self-assembled
monolayers of 4-MBA. A Cobalt(II) tetracarboxyphthalocyanine (Co(COOH)4Pc) complex was covalently
bonded to external portion of af-SWCNTs to complete the
final nanoelectrode ensemble. X-ray
photoelectron spectroscopy (XPS) and Atomic Force Microcopy (AFM) confirmed the effectiveness of the
assembling steps on the gold surface starting from the Au/MBA SAMs. The system Au/4-MBA/af-SWCNTs
shows an interface with large ordered array, which exhibits a high activity for the electrooxidation of Lcysteine
(L-cys). Theoretical calculations suggest that the incorporation of the af-SWCNTs increased the
activity of the assembly to electronic transfer and it was observed that the electrooxidation reaction is
energetically favorable.