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    Nanomechanical mapping of latent fingermarks: A preliminary investigation into the changes in surface interactions and topography over time

    Access Status
    Fulltext not available
    Authors
    Dorakumbura, B.
    Becker, T.
    Lewis, Simon
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Dorakumbura, B. and Becker, T. and Lewis, S. 2016. Nanomechanical mapping of latent fingermarks: A preliminary investigation into the changes in surface interactions and topography over time. Forensic Science International. 267: pp. 16-24.
    Source Title
    Forensic Science International
    DOI
    10.1016/j.forsciint.2016.07.024
    ISSN
    0379-0738
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/44909
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 Elsevier Ireland Ltd. Crime scene investigations often rely on successful development of latent fingermarks for personal identification. In this context, exploring fundamental properties of latent fingermarks is vital for developing robust and more effective detection techniques. Here in a novel approach, PeakForce quantitative nanomechanical mapping (PF QNM) atomic force microscopy (AFM) has been used to study the variations in surface adhesion and topography of latent fingermark droplets over time. It was found that variation in adhesion was exhibited even across the surface of a single fingermark droplet, suggesting that individual droplets are heterogeneous in chemical composition on the nanoscale. The technique was successfully employed in observing the topographical variation of eccrine droplets, which has not been achieved using other optical microscopy techniques. In addition, the adhesion of fingermark droplets changed significantly as they aged. Propagation of a thin film of material from the fingermark ridges across the furrows, starting immediately after deposition, was captured in real-time, demonstrating the dynamic nature of the deposit. These results will aid in providing a more complete fundamental understanding of latent fingermark residue, allowing the more rational development of new detection techniques, especially those involving nanostructured materials.

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