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    A methodology to detect explosive residues using a gelled ionic liquid based field-deployable electrochemical device

    Access Status
    Fulltext not available
    Embargo Lift Date
    2022-03-07
    Authors
    Hay, C.E.
    Lee, Juni
    Silvester-Dean, Debbie
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hay, C.E. and Lee, J. and Silvester, D.S. 2020. A methodology to detect explosive residues using a gelled ionic liquid based field-deployable electrochemical device. Journal of Electroanalytical Chemistry.
    Source Title
    Journal of Electroanalytical Chemistry
    DOI
    10.1016/j.jelechem.2020.114046
    ISSN
    1572-6657
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT170100315
    URI
    http://hdl.handle.net/20.500.11937/79835
    Collection
    • Curtin Research Publications
    Abstract

    A simple and robust, low-cost electrochemical device is proposed for the combined sampling and detection of the trace solid explosive 2,4,6-trinitrotoluene (TNT) from a non-porous surface. Four different substrates were investigated to collect explosive residue – a bare thin-film electrode, glass microfiber filter paper, a gel-polymer electrolyte (GPE), and a GPE-filter paper composite. The GPE contained the hydrophobic room temperature ionic liquid (RTIL) trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P14,6,6,6][NTf2]) and the polymer poly(methyl methacrylate) (PMMA). A simple “swabbing” technique was used to sample explosive residue on all substrates. Square wave voltammetry was performed to determine the effects of oxygen and moisture on the current response. The most robust method for use in the field – a GPE drop-casted on a TFE – was applied in real environments using a hand-held portable potentiostat. The prototype device was able to detect TNT with a 30 min development time in different ambient environmental conditions. The portability, ease of use and low-cost of the sensor device makes this a viable platform for the rapid onsite detection of explosives.

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