多功能纳米铂复合体制备及其对汗潜指印显现研究  

Synthesis of Multifunctional Nano-composite for Development of Fingermarks

作　　者：黄锐[1] 陈虹宇[1] HUANG Rui;CHEN Hongyu(Southwest University of Political Science and Law, Forensic Engineering Research Center of Universities in Chongqing, Chongqing 401120, China)

机构地区：[1]西南政法大学重庆高校物证技术工程研究中心,重庆401120

出　　处：《刑事技术》2017年第4期277-282,共6页Forensic Science and Technology

基　　金：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)

摘　　要：目的制备新型的多功能磁性纳米复合体并将其用于汗潜指印的显现。方法创新地使用静电层自组装法(LBL),成功构建了以聚乙烯亚胺(PEI)修饰的Fe_3O_4为"蛋黄"、纳米铂(Pt NPs)为"蛋白"、荧光藻红蛋白(PE)为"蛋壳"的磁性荧光纳米铂蛋体系(Fe_3O_4@Pt@PE)。基于磁性荧光纳米铂蛋体系自身的荧光性和磁性能,将其应用于不同客体表面的汗潜指印显现,并考察了磁性荧光纳米铂蛋粉末显现效果及其在不同客体上的适用性。结果磁性荧光纳米铂蛋具有优良的磁性能和荧光性能。粉末显现效果好,在显现观察系统中可检见黄色荧光纹线,且纹线细节特征明显。总体上,磁性荧光纳米铂蛋粉末显现效果优于传统荧光粉末以及磁性粉末。结论磁性荧光纳米铂蛋荧光性能稳定、磁性能优良,可用于渗透、非渗透客体表面潜指印的显现,有望在刑事技术领域中得到推广。Objective To prepare the Fe3O4@Pt@PE nanoeggs for latent fingermark development.Methods With an innovative utilization of self-assemblage through static absorption layer by layer,the magnetism-fluorescent Fe3O4@Pt@PE nano-composites(nanoeggs)were successfully constructed by the polyethyleneimine(PEI)-coated Fe3O4nanoparticles 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 Fe3O4@Pt@PE nano-composites were shown of their average diameter of350nm,appearing excellent dispersion and emitting585nm fluorescence when excited at521nm.The Fe3O4@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 Fe3O4@Pt@PE nano-composites can develop latent fingermarks with very clear third-level minutial ridges of better visibility and excellent quality.

关 键 词：汗潜指印显现 磁性荧光纳米铂蛋 铂 静电层层自组装法 

分 类 号：DF794.1[政治法律—诉讼法学]