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    • Dpto. Química Física y Química Inorgánica
    • DEP63 - Artículos de revista
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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/20891

    Título
    Nanoscale Au-In alloy-oxide core-shell particles as electrocatalysts for efficient hydroquinone detection
    Autor
    Medina Plaza, Cristina
    Rodríguez Méndez, María Luzuntranslated ORCID
    Sutter, Peter
    Tong, Xiang
    Sutter, Elli
    Año del Documento
    2015
    Editorial
    American Chemical Society
    Descripción
    Producción Científica
    Documento Fuente
    J. Phys. Chem. C 2015, 119, 25100−25107
    Abstract
    The presence of hydroquinone (HQ), a phenol ubiquitous in nature and widely used in industry, needs to be monitored because of its toxicity to the environment. Here we demonstrate efficient detection of HQ using simple, fast, and noninvasive electrochemical measurements on indium tin oxide (ITO) electrodes modified with nanoparticles comprising bimetallic Au−In cores and mixed Au−In oxide shells. Whereas bare ITO electrodes show very low activity for the detection of HQ, their modification with Au−In core−shell nanoparticles induces a pronounced shift of the oxidation peak to lower potentials, i.e., facilitated oxidation. The response of the different electrodes was correlated with the initial composition of the bimetallic nanoparticle cores, which in turn determined the amount of Au and In stabilized on the surface of the amorphous Au−In oxide shells available for the electrochemical reaction. While adding core−shell nanostructures with different compositions of the alloy core facilitates the electrocatalytic (reduction-) oxidation of HQ, the activity is highest for particles with AuIn cores (i.e., a Au:In ratio of 1). This optimal system is found to follow a single pathway, the two-electron oxidation of the quinone−hydroquinone couple, which gives rise to high oxidation peaks and is most effective in facilitating the electrode-to-analyte charge transfer and thus detection. The limits of detection (LOD) decreased when increasing the amount of Au exposed on the surface of the amorphous Au−In oxide shells. The LODs were in the range of 10−5−10−6 M and were lower than those obtained using bulk Au.
    Materias (normalizadas)
    Nanoparticle
    Sensor
    ISSN
    1932-7447
    Revisión por pares
    SI
    DOI
    10.1021/acs.jpcc.5b07960
    Patrocinador
    Research carried out in part at the Center for Functional Nanomaterials, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract DE-SC0012704. EB- 14,
    University of Valladolid (PIF-UVa)
    Ministerio de Economía, Industria y Competitividad – FEDER (Grant CICYT AGL2012-33535)
    Version del Editor
    https://www.acs.org/
    Propietario de los Derechos
    American Chemical Society
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/20891
    Derechos
    restrictedAccess
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    • DEP63 - Artículos de revista [188]
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