Flurorescent TiO2 powders preparded using a new perylene diimide dye: Applications in latent fingermark detection

Mi Jung Choi, Tanya Smoother, Aiden Martin, Andrew McDonagh, Philip Maynard, Christopher Lennard, Claude Roux

    Research output: Contribution to journalArticle

    68 Citations (Scopus)

    Abstract

    A new, highly fluorescent dye was synthesised using oleylamine combined with a perylene dianhydride compound. The new dye was characterised by 1H NMR, UV–vis spectroscopy and fluorescence spectroscopy as well as quantum yield. The dye was absorbed onto titanium dioxide nanoparticles for use as a fingerprint detection powder. The new fluorescent powder was applied to latent fingermarks deposited onto different non-porous surfaces and compared with commercial fluorescent powders. The powder exhibits strong fluorescence at 650–700 nm under excitation at 505 nm. On glass surfaces, the new powder gave images showing tertiary-level detail of the fingermark ridges with almost no background development. Compared with current magnetic fluorescent powders, the new powder was slightly weaker in fluorescence intensity but produced significantly less background development, resulting in good contrast between the fingermark and the substrate
    Original languageEnglish
    Pages (from-to)154-160
    Number of pages7
    JournalForensic Science International
    Volume173
    Issue number2-3
    DOIs
    Publication statusPublished - 2007

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