Impact of Aggregation-Induced Emission on Latent Fingerprint Revelation Based on Surface Energy Differences
Fingerprints are one of the common trace physical evidence at crime scenes.To improve the efficiency of on-site investigation,the extraction methods for potential fingerprint display are enhanced,and the impact of surface free energy on the aggregation-induced emission(AIE)material for potential fingerprint extraction is explored.Twelve common types of oil and sweat latent fingerprints left on the marked objects are selected as research objects.AIE materials,combined with optical technology,are used to display fingerprints,and the display effect of fingerprints are evaluated based on surface free energy differences.The experimental results show that the AIE technology exhibits strong universality in displaying fingerprints.Cationic AIE molecules and anionic biological macromolecules(such as amino acids)bind specifically under electrostatic action,emitting yellow fluorescence under 470 nm of blue light.The surface free energy between the fingerprint and the object determines the adsorption ability of AIE molecules.Stronger surface energy leads to stronger adsorption effect of AIE molecules.Furthermore,the higher the fluorescence intensity,the better the display effect.However,at the same time,the properties of the imprinted object,surface color,fingerprint substances,and environmental pollution can affect the surface energy of fingerprints and the object,thereby affecting the appearance results of fingerprints.
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