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    A multimodal optical and electrochemical device for monitoring surface reactions: Redox active surfaces in porous silicon Rugate filters

    Access Status
    Fulltext not available
    Authors
    Ciampi, S.
    Guan, B.
    Darwish, Nadim
    Zhu, Y.
    Reece, P.
    Justin Gooding, J.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Ciampi, S. and Guan, B. and Darwish, N. and Zhu, Y. and Reece, P. and Justin Gooding, J. 2012. A multimodal optical and electrochemical device for monitoring surface reactions: Redox active surfaces in porous silicon Rugate filters. Physical Chemistry Chemical Physics. 14 (47): pp. 16433-16439.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/c2cp43461j
    ISSN
    1463-9076
    School
    Nanochemistry Research Institute
    URI
    http://hdl.handle.net/20.500.11937/43237
    Collection
    • Curtin Research Publications
    Abstract

    Herein, mesoporous silicon (PSi) is configured as a single sensing device that has dual readouts; as a photonic crystal sensor in a Rugate filter configuration, and as a high surface area porous electrode. The as-prepared PSi is chemically modified to provide it with stability in aqueous media and to allow for the subsequent coupling of chemical species, such as via Cu(i)-catalyzed cycloaddition reactions between 1-alkynes and azides ("click" reactions). The utility of the bimodal capabilities of the PSi sensor for monitoring surface coupling procedures is demonstrated by the covalent coupling of a ferrocene derivative, as well as by demonstrating ligand-exchange reactions (LER) at the PSi surface. Both types of reactions were monitored through optical reflectivity measurements, as well as electrochemically via the oxidation/reduction of the surface tethered redox species.

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