Nanoporous alumina-based interferometric transducers ennobled

Roman Dronov, Andrew Jane, Joseph Shapter, Alistair Hodges, Nicolas Voelcker

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    A high fidelity interferometric transducer is designed based on platinum-coated nanoporous alumina films. The ultrathin metal coating significantly improves fidelity of the interferometric fringe patterns in aqueous solution and increases the signal-to-noise ratio. The performance of this transducer is tested with respect to refractive index unit (RIU) sensitivity measured as a change in effective optical thickness (EOT) in response to a solvent change and compared to porous silicon based transducers. RIU sensitivity in the order of 55% is attainable for porous alumina providing excellent signal-to-noise ratio, which exceeds the sensitivity of current interferometric transducers. Finally, as a proof-of-principle, we demonstrate biosensing with two distinct immunoglobulin antibodies.

    Original languageEnglish
    Pages (from-to)3109-3114
    Number of pages6
    JournalNanoscale
    Volume3
    Issue number8
    DOIs
    Publication statusPublished - Aug 2011

    Bibliographical note

    Copyright:
    Copyright 2011 Elsevier B.V., All rights reserved.

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