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

G. Swati | Zendy; Swati Bishnoi | Zendy; Paramjeet Singh | Zendy; Naina Lohia | Zendy; Vishnu V. Jaiswal | Zendy; M. K. Dalai | Zendy; D. Haranath | Zendy

Open Access

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

Author(s) -

G. Swati,

Swati Bishnoi,

Paramjeet Singh,

Naina Lohia,

Vishnu V. Jaiswal,

M. K. Dalai,

D. Haranath

Publication year - 2017

Publication title -

analytical methods

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.615

H-Index - 67

eISSN - 1759-9679

pISSN - 1759-9660

DOI - 10.1039/c7ay02713c

Subject(s) - phosphorescence , colored , fluorescence , chemistry , high contrast , contrast (vision) , interference (communication) , fingerprint (computing) , porosity , computer science , materials science , artificial intelligence , organic chemistry , optics , telecommunications , physics , channel (broadcasting) , composite material

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 SrAl2O4:Eu2+,Dy3+ 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.

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