Chemistry of extracting high-contrast invisible fingerprints from transparent and colored substrates using a novel phosphorescent label

Traditionally used fluorescent powders for developing invisible (latent) fingerprints involve complicated operation and show characteristics of auto-fluorescence interference and high toxicity. To overcome these serious drawbacks we report a novel application and facile methodology to extract high c...

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Bibliographic Details
Published in:Analytical methods 2018-01, Vol.1 (3), p.38-313
Main Authors: Swati, G, Bishnoi, Swati, Singh, Paramjeet, Lohia, Naina, Jaiswal, Vishnu V, Dalai, M. K, Haranath, D
Format: Article
Language:English
Subjects:
Fingerprints
Fluorescence
Phosphorescence
Powder
Substrates
Sweat
Toxicity
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Summary:Traditionally used fluorescent powders for developing invisible (latent) fingerprints involve complicated operation and show characteristics of auto-fluorescence interference and high toxicity. To overcome these serious drawbacks we report a novel application and facile methodology to extract high contrast fingerprints on non-porous and porous substrates using a chemically inert, visible light excitable, and nanosized SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphorescent label in the dark. The chemistry of non-covalent physisorption interaction between the long afterglow phosphor powder and sweat residue in fingerprints has been discussed in detail. Real-time fingerprint development on porous and non-porous substrates has also been performed. Conventional fluorescent powders for developing latent fingerprints show characteristics of complicated operation, auto-fluorescence interference and high toxicity. To overcome these issues, we report a facile methodology to extract high contrast fingerprints on non-porous and porous substrates using a phosphorescent label.
ISSN:1759-9660
1759-9679
DOI:10.1039/c7ay02713c