Latent Fingerprint Display Based on Aggregation-Induced Emission Technique
Fingerprint marks on objects remain unchanged throughout their lifetime and have evidential value for individual recognition.However,many factors influence the extraction of on-site fingerprints,including poor object adaptability,ultraviolet optical damage,rough object surface limitations,complex post-processing of reagent display,and unclear tertiary feature display.Therefore,the display and extraction of on-site fingerprints have always been important research topics in the field of criminal technology.In this study,a potential fingerprint display method based on aggregation-induced emission(AIE)technology is proposed.AIE polymers excited by blue light and emitting yellow light were synthesized,and organic solvent microgrid atomization technology was used to obtain high-quality fingerprint images.Results show that AIE polymers exhibit high stability and can be stored easily for a long time.The secondary and tertiary detailed features of fingerprint marks can be clearly observed from the display results.There is also universality among various common nonpermeable and permeable objects on site.For some difficult objects,it has good visualization effects and exhibits highly efficient in situ fingerprint extraction ability.AIE nebulization can be used for displaying potential fingerprint marks on common or even difficult objects.It can target and locate potential fingerprints,extract contact exfoliated cells in situ,and provide technical support for fingerprint display and the discovery of contact DNA evidence during on-site investigations.
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