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Abstract:

The characterization and application of a polyelectrolyte-surfactant supramolecular assembly formed by poly(allylamine) and dodecyl sulfate (PA-DS) on a screen-printed graphite electrode for the preparation of electrochemical sensing platforms are presented. The system was characterized by X-ray reflectometry (XRR) and grazing-incidence small-angle X-ray scattering (GISAXS) and tested with four benchmark electrochemical probes undergoing different electron-transfer mechanisms on carbon: ferrocyanide, hexaammineruthenium, ascorbic acid, and dopamine. The polyelectrolyte acts as a scaffold favoring the incorporation of the ferrocyanide, an ion oppositely charged to poly(allylamine). Also, its ability to incorporate carbon nanotubes (CNT) is presented. The composite material PA-DS-CNT is able to electrocatalyze the oxidation of dopamine, allowing its detection at micromolar levels in the presence of 100 times higher concentrations of ascorbate and it is shown to be stable, while XRR and GISAXS results confirm a lamellar structure with well-defined domains, not perturbed by the presence of the CNT. The dispersion is easily prepared in aqueous solution and could facilitate the processing of the CNT with an efficient loading and yielding a more robust carbon-based material for sensing applications. © 2011 American Chemical Society.

Registro:

Documento: Artículo
Título:Electrochemical sensing platform based on polyelectrolyte-surfactant supramolecular assemblies incorporating carbon nanotubes
Autor:Cortez, M.L.; Ceolín, M.; Azzaroni, O.; Battaglini, F.
Filiación:INQUIMAE, Departamento Química Inorgánica, Analítica y Química Física, Argentina
PINMATE, Departamento de Industrias, Universidad de Buenos, Pabellón 2, C1428EHA Buenos Aires, Argentina
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Departamento de Química, Universidad Nacional de la Plata, La Plata, Buenos Aires, Argentina
Palabras clave:Ascorbic acids; Carbon based materials; Dodecyl sulfate; Electrochemical probe; Electrochemical sensing; Electron transfer mechanisms; Gi-SAXS; Grazing incidence small-angle X-ray scattering; Micromolar level; Poly(allylamine); Screen-printed; Sensing applications; Supramolecular assemblies; X-ray reflectometry; Azobenzene; Brain; Carbon nanotubes; Electrochemical sensors; Graphite electrodes; Ketones; Organic acids; Polyelectrolytes; Scaffolds; Surface active agents; X ray scattering; Supramolecular chemistry
Año:2011
Volumen:83
Número:20
Página de inicio:8011
Página de fin:8018
DOI: http://dx.doi.org/10.1021/ac202213t
Título revista:Analytical Chemistry
Título revista abreviado:Anal. Chem.
ISSN:00032700
CODEN:ANCHA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032700_v83_n20_p8011_Cortez

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Citas:

---------- APA ----------
Cortez, M.L., Ceolín, M., Azzaroni, O. & Battaglini, F. (2011) . Electrochemical sensing platform based on polyelectrolyte-surfactant supramolecular assemblies incorporating carbon nanotubes. Analytical Chemistry, 83(20), 8011-8018.
http://dx.doi.org/10.1021/ac202213t
---------- CHICAGO ----------
Cortez, M.L., Ceolín, M., Azzaroni, O., Battaglini, F. "Electrochemical sensing platform based on polyelectrolyte-surfactant supramolecular assemblies incorporating carbon nanotubes" . Analytical Chemistry 83, no. 20 (2011) : 8011-8018.
http://dx.doi.org/10.1021/ac202213t
---------- MLA ----------
Cortez, M.L., Ceolín, M., Azzaroni, O., Battaglini, F. "Electrochemical sensing platform based on polyelectrolyte-surfactant supramolecular assemblies incorporating carbon nanotubes" . Analytical Chemistry, vol. 83, no. 20, 2011, pp. 8011-8018.
http://dx.doi.org/10.1021/ac202213t
---------- VANCOUVER ----------
Cortez, M.L., Ceolín, M., Azzaroni, O., Battaglini, F. Electrochemical sensing platform based on polyelectrolyte-surfactant supramolecular assemblies incorporating carbon nanotubes. Anal. Chem. 2011;83(20):8011-8018.
http://dx.doi.org/10.1021/ac202213t