A magnetic and excited state intramolecular proton transfer fluorescent powder for latent fingermark visualization

Fingermarks constitute one of the most important physical evidence categories in forensic science. Improvements on detection and visualization of fingermarks are thus of utmost importance and rely strongly on the developer’s properties. Magnetic-fluorescent dual powders are a great alternative, as t...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2024-07, Vol.26 (7), p.165, Article 165
Main Authors: de Oliveira, Elisa M. N., Reis, Cassio F., Dillenburg, Crisle V., Lobo, Bernardo J. M., de Souza, Michèle O., Balzaretti, Naira M., Papaléo, Ricardo M., Campo, Leandra F.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Emission analysis
Fingerprints
Fluorescent dyes
Fluorescent indicators
Forensic science
Glass substrates
Image contrast
Image manipulation
Inorganic Chemistry
Iron oxides
Lasers
Latent fingerprints
Magnetic properties
Materials Science
Nanomaterials
Nanoparticles
Nanotechnology
Natural lighting
Optical Devices
Optics
Photonics
Physical Chemistry
Powder
Silica
Ultraviolet radiation
Visualization
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Summary:Fingermarks constitute one of the most important physical evidence categories in forensic science. Improvements on detection and visualization of fingermarks are thus of utmost importance and rely strongly on the developer’s properties. Magnetic-fluorescent dual powders are a great alternative, as they can be easily manipulated through a magnetic applicator and, in addition, provide a fluorescent image of the fingermark, improving fingermark/substrate contrast. This work presents a novel dual-fingermark developer powder composed by core–shell iron oxide/silica nanoparticles functionalized covalently with a 2-(5′-amino-2′-hydroxyphenyl)benzoxazole fluorescent dye. The brush and revealing performance of eccrine, natural, and sebaceous deposits fingermarks were evaluated using the powder method on glass substrates with bright and dark surfaces. The nanoparticles displayed superparamagnetic behavior and high emission in the green region. The dual powder adheres into latent fingermarks and produces better visualization of sebaceous residues. The fingermark images under natural light exhibited development with sufficient contrast for dark surfaces. Under UV light, the intense green fluorescence produces better fingermark visualization. Expanded images allowed clear identification of small features, including minutiae. This class of composite nanomaterial showed thus adequate characteristics to be used as a developer for latent fingermarks.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-024-06082-4