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《Forensic Science and Technology》 2017-04
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Synthesis of Multifunctional Nano-composite for Development of Fingermarks

HUANG Rui;CHEN Hongyu;Southwest University of Political Science and Law, Forensic Engineering Research Center of Universities in Chongqing;  
Objective To prepare the Fe_3O_4@Pt@PE nanoeggs for latent fingermark development. Methods With an innovative utilization of self-assemblage through static absorption layer by layer, the magnetism-fluorescent Fe_3O_4@Pt@PE nano-composites(nanoeggs) were successfully constructed by the polyethyleneimine(PEI)-coated Fe_3O_4 nanoparticles as the "egg yolk", the platinum nano-particles(Pt NPs) as the "egg white" and the farthest outer layer of fluorescent phycoerythrin(PE) as the "egg shell". The nanoeggs were characterized by scanning electron microscopy, UV-vis spectrum, X-Ray powder diffraction, superconducting quantum interference magnetometering and fluorescence spectrometry, respectively. Such the newly-prepared yellow-fluorescent Fe3O4@Pt@PE nanoeggs were to detect latent fingerpmarks deposited onto different surfaces including glass, plastic and paper, together with the effect of this application to be explored and discussed. Results The created magnetic and fluorescent Fe_3O_4@Pt@PE nano-composites were shown of their average diameter of 350 nm, appearing excellent dispersion and emitting 585 nm fluorescence when excited at 521 nm. The Fe_3O_4@Pt@PE nanoeggss revealed clear ridges of the developed fingerprints no matter whether they were on nonporous surface like glass or porous surface e.g., paper. Compared to the latent fingermarks on porous surfaces, those on the nonporous surfaces turned out sharper and clearer contrast. Conclusion As low-cost syntheses, the yellow-fluorescent and magnetic Fe_3O_4@Pt@PE nano-composites can develop latent fingermarks with very clear third-level minutial ridges of better visibility and excellent quality.
【Fund】: 重庆市科学技术委员会基础与前沿研究计划项目(No.cstc2016jcyj A0503);; 重庆市教育委员会科学技术研究项目(No.KJ1500111);; 重庆高校物证技术工程研究中心研究项目(No.LCFS1421);; 2015年西南政法大学资助项目(No.2015XZQN-27)
【CateGory Index】: D918.91
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