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RSC Advances
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DOI: 10.1039/C5RA16614D
COMMUNICATION
Journal Name
Fig. 6 Fingerprint detection by NIR-LP, irradiated by UV light onto that the NIR-LP nanoparticles adhere preferentially to the
the surface of an aluminium foil (A), coin (B), and glass slide (C) fingerprint ridges and the ESIPT process is reformed, thus producing
analysis of correspondences.
a fluorescence-enhanced LFPs image. The adsorption of NIR-LP
crystals on the fingerprints was proved by solid state fluorescent
emission, as shown in Fig. 8, which is in agreement with that
observed in water-CH3CN mixtures (Fig. 2B).
In real crime scenes, we are more likely to encounter aged
fingerprint. Thus we further demonstrate the robustness of the
sensor for practical use, and aged fingerprints (10 days) were
developed. As shown in Fig. 7, the fingerprint ridge details could still
be well visualized.
Conclusions
In summary, we have presented the synthesis and properties
of a facile NIR sensor NIR-LP for the recognition of the latent
fingerprints. Compared with the existing methods to identify the
LFPs (Table S1), the probe NIR-LP is the first example of a NIR
sensor possessing ESIPT - AIE property to visualize the latent LFPs in
solution. In addition, this approach requires moderate incubation
time (20 min) and needs no expensive or hazardous reagents,
sophisticated instrument or post-treatment procedures. It is worth
mentioning that we have successfully taken advantage of the probe
NIR-LP to identify the old (10 days) latent fingerprint. This method
employing fluorescent AIE materials is expected to be a quite
simple, convenient, and universal technique for the high
visualization of LFPs. We envisage that this AIE strategy can be used
for various forensic applications.
Fig. 7 Images of old sebaceous fingerprints on a aluminium foil (A),
coin (B) and glass (C) developed by AIE of NIR-LP aggregates. NIR-LP
concentration: 0.25 mM, the water fraction was 80%. All
fluorescent images were excited with a 365 nm UV lamp.
Acknowledgements
This work is sponsored by the Science and Technology of Public
Security of Jiangsu Police Institute - the Key Construction Disciplines
at the Provincial Level of Jiangsu Province during 12th Five-Year
Plan (2011-2015).
Scheme 2. The proposed mechanism of the fingerprint
enhancement by AIE of NIR-LP.
Notes and references
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As reported previously,10,11,21 hydrophobic particles
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4 | J. Name., 2012, 00, 1-3
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