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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/40969

    Título
    Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: Sensing properties towards catechol
    Autor
    García Hernández, Celiauntranslated
    García Cabezón, Ana Cristinauntranslated ORCID
    Medina Plaza, Cristina
    Martín Pedrosa, Fernandountranslated ORCID
    Blanco Val, María Yolandauntranslated ORCID
    Saja Sáez, José Antonio de
    Rodríguez Méndez, María Luzuntranslated ORCID
    Año del Documento
    2015
    Editorial
    Beilstein
    Descripción
    Producción Científica
    Documento Fuente
    Beilstein Journal of Nanotechnology, 2015, vol. 6. 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.
    Palabras Clave
    Catechol
    Catecol
    Conducting polymers
    Polímeros conductores
    Electropolymerization
    Electropolimerización
    Gold nanoparticles
    Nanopartículas de oro
    ISSN
    2190-4286
    Revisión por pares
    SI
    DOI
    10.3762/bjnano.6.209
    Patrocinador
    Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (project CICYTAGL2012-33535)
    Junta de Castilla y Leon (project VA-032U13)
    Universidad de Valladolid (grant FPI-UVA)
    Version del Editor
    https://www.beilstein-journals.org/bjnano/articles/6/209
    Propietario de los Derechos
    © 2015 Beilstein
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/40969
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
    Collections
    • DEP63 - Artículos de revista [204]
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    Attribution-NonCommercial-NoDerivatives 4.0 InternacionalExcept where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internacional

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