Sol-gel derived ZnO/PVP nanocomposite thin film for superoxide radical sensor

    Authors

    T. B. Du; H. W. Song;O. J. Ilegbusi

    Comments

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    Abbreviated Journal Title

    Mater. Sci. Eng. C-Biomimetic Supramol. Syst.

    Keywords

    zinc oxide; nanoparticle; sol-gel; sensor; nanocomposite; ZNO FILMS; PEROXIDASE; DISMUTASES; OXIDATION; OXYGEN; ANION; Materials Science, Multidisciplinary

    Abstract

    Pure ZnO films and ZnO nanoparticle-dispersed polyvinylpyrrolidone (PVP) composite films are prepared on Pyrex glass substrates by the sol-gel dip-coating technique utilizing zinc acetate precursor. The thin films are extensively characterized for surface morphology, chemistry, and nanocrystallite size using various advanced analytical techniques including Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). For the processing conditions considered, ZnO, semiconductor thin films with nanocrystallite size 20-30 nm are obtained. The ZnO nanoparticle size in the PVP composite film increases with increase in ZnO content. The resistance of both the synthesized ZnO and ZnO/PVP thin films decrease significantly after exposure to solution containing superoxide anion radicals (SOR). The results thus indicate that ZnO and ZnO/PVP composite thin films can be used as biosensors for SOR and potentially for characterizing the antioxidant properties of fluids. (c) 2006 Elsevier B.V. All rights reserved.

    Journal Title

    Materials Science & Engineering C-Biomimetic and Supramolecular Systems

    Volume

    27

    Issue/Number

    3

    Publication Date

    1-1-2007

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    414

    Last Page

    420

    WOS Identifier

    WOS:000245130000010

    ISSN

    0928-4931

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