Abstract
Fingerprints are an important kind of material evidence with the key function in personal identification, which are unique and life-long to everyone. Latent (invisible) fingerprints are common at the crime scene, needing to be visualized with proper methods in order to identify sources of the fingerprints in routine forensic practice. Fluorescent imaging of latent fingerprints has the advantage of high contrast, sensitivity, selectivity, and less dependency on instruments. Taking the environment and users' safety into consideration, organic materials for fluorescent imaging of latent fingerprints are reviewed mainly in recent 5 years. New strategies of fingerprint reagents and improved performances established for fingerprint development based on fluorescent organic materials are discussed in the view of forensic practice. In addition, we briefly highlight current challenges of recent fluorescent imaging works based on organic materials for the latent fingerprints development in forensic practice.
Highlights
Fingerprints have been one of the most important gold biometric features for personal identification in the forensic science field for more than 100 years, because of the uniqueness and lasting consistency over the lifetime
On the other hand, aggregationinduced emission (AIE) exhibits remarkable bright fluorescence in aggregate or solid state (Mei et al, 2015; Zhao et al, 2017; Chen et al, 2018), and AIE-active molecules solely have been used for latent fingerprints (LFPs) bioimaging with high contrast and short developing time (Li et al, 2012; Xu et al, 2014; Suresh et al, 2018)
A bilayer system based on conjugated and fluorescent polymers was used for the LFP development of stainless steel, with the first layer of polypyrrole or PEDOY electrodeposited onto the surface and the second layer of a fluorescent Poly(2,2′:5′,2′′-terthiophene) electrodeposited onto the first layer
Summary
Fingerprints are an important kind of material evidence with the key function in personal identification, which are unique and life-long to everyone. Latent (invisible) fingerprints are common at the crime scene, needing to be visualized with proper methods in order to identify sources of the fingerprints in routine forensic practice. Fluorescent imaging of latent fingerprints has the advantage of high contrast, sensitivity, selectivity, and less dependency on instruments. Taking the environment and users’ safety into consideration, organic materials for fluorescent imaging of latent fingerprints are reviewed mainly in recent 5 years. New strategies of fingerprint reagents and improved performances established for fingerprint development based on fluorescent organic materials are discussed in the view of forensic practice. We briefly highlight current challenges of recent fluorescent imaging works based on organic materials for the latent fingerprints development in forensic practice
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