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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/21105

    Título
    Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: sensing properties towards catechol
    Autor
    García Hernández, CeliaAutoridad UVA
    García Cabezón, Ana CristinaAutoridad UVA Orcid
    Medina Plaza, CristinaAutoridad UVA
    Martín Pedrosa, FernandoAutoridad UVA Orcid
    Blanco Val, María YolandaAutoridad UVA Orcid
    Saja Saez, José Antonio DeAutoridad UVA Orcid
    Rodríguez Méndez, María LuzAutoridad UVA Orcid
    Año del Documento
    2015
    Editorial
    Beilstein
    Descripción
    Producción Científica
    Documento Fuente
    Beilstein Journal of Nanotechnology, October 2015, vol. 6, n. 1, p. 2052-2061
    Abstract
    Two different methods were used to obtain polypyrrole/AuNP (Ppy/AuNP) composites. One through the electrooxidation of the pyrrole monomer in the presence of colloidal gold nanoparticles, referred to as trapping method (T), and the second one by electrodeposition of both components from one solution containing the monomer and a gold salt, referred to as cogeneration method (C). In both cases, electrodeposition was carried out through galvanostatic and potentiostatic methods and using platinum (Pt) or stainless steel (SS) as substrates. Scanning electron microscopy (SEM) demonstrated that in all cases gold nanoparticles of similar size were uniformly dispersed in the Ppy matrix. The amount of AuNPs incorporated in the Ppy films was higher when electropolymerization was carried out by chronopotentiometry (CP). Besides, cogeneration method allowed for the incorporation of a higher number of AuNPs than trapping. Impedance experiments demonstrated that the insertion of AuNPs increased the conductivity. As an electrochemical sensor, the Ppy/AuNp deposited on platinum exhibited a strong electrocatalytic activity towards the oxidation of catechol. The effect was higher in films obtained by CP than in films obtained by chronoamperometry (CA). The influence of the method used to introduce the AuNPs (trapping or cogeneration) was not so important. The limits of detection (LOD) were in the range from 10−5 to 10−6 mol/L. LODs attained using films deposited on platinum were lower due to a synergy between AuNPs and platinum that facilitates the electron transfer, improving the electrocatalytic properties. Such synergistic effects are not so pronounced on stainless steel, but acceptable LOD are attained with lower price sensors.
    Materias (normalizadas)
    Catechol
    Conducting polymers
    Electropolymerization
    Gold nanoparticles (AuNPs)
    Polypyrrole
    Revisión por pares
    SI
    DOI
    10.3762/bjnano.6.209
    Patrocinador
    Ministerio de Economía, Industria y Competitividad – FEDER (Grant CICYT AGL2012-33535)
    Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA-032U13)
    University of Valladolid (PIF-UVa)
    Version del Editor
    http://www.beilstein-journals.org/bjnano/single/articleFullText.htm?publicId=2190-4286-6-209
    Propietario de los Derechos
    Celia García Hernández et al; Beilstein-Institut
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/21105
    Derechos
    openAccess
    Aparece en las colecciones
    • BioEcoUVa - Artículos de revista [195]
    • DEP63 - Artículos de revista [322]
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