二氧化钒多级纳米结构材料显现潜指纹研究  

Vanadium Dioxide Prepared into Hierarchical Nano-structures Having Latent Fingerprints Developed

作　　者：马艺宁 梁永宽 金晓东[1] 徐同祥[1] MA Yining;LIANG Yongkuan;JIN Xiaodong;XU Tongxiang(Department of Forensic Science,Jiangsu Police Institute,Nanjing 210031,China)

机构地区：[1]江苏警官学院刑事科学技术系,南京210031

出　　处：《刑事技术》2023年第1期47-52,共6页Forensic Science and Technology

基　　金：公安部科技强警基础工作专项(2019GABJC19);江苏省自然科学基金项目(BK20190809);江苏警官学院高层次引进人才科研启动费资助项目(JSPI19GKZL401);江苏警官学院法庭科学先进材料开发应用科研创新团队(2021BK01)。

摘　　要：本文旨在建立使用VO_(2)多级纳米结构材料显现潜指纹的方法。以氧化二乙酰丙酮合钒和过氧化氢水溶液为原料,通过溶剂热法一步合成VO_(2)多级纳米结构材料,利用X射线衍射(XRD)和场发射扫描电子显微镜(FESEM)对合成粉体进行表征。最后采用撒粉刷显法对不同客体上的汗潜指纹、油潜指纹进行显现,并与传统粉末的显现效果进行对比。结果表明,合成的VO_(2)为深蓝色粉体,纯度高,形貌均匀,为纳米棒组成的亚微米球多级结构;该粉体可以与指纹遗留物质相结合,具有较高的灵敏度,显现的指纹纹型清晰,纹线连贯,对比度高,细节特征显著。与传统粉末相比,VO_(2)多级纳米结构材料在载玻片和透明塑料杯上潜指纹的显现效果要好于金粉、银粉和磁性粉;在铝箔上VO_(2)的显现效果好于金粉和银粉。VO_(2)多级纳米结构材料合成方法简单、成本低,制备的VO_(2)纯度高、无杂相;潜指纹显现实验证明该粉体可有效显现非渗透和渗透性客体上的汗潜、油潜指纹,并且在载玻片、透明塑料杯和铝箔上潜指纹的显现效果优于传统粉末。A novel way has been here developed for latent fi ngerprint to detect through the hierarchical nano-structural powders of VO_(2)(vanadium dioxide).Such the innovative nano powders were synthesized from a one-step solvothermal reaction with the raw materials of vanadium acetylacetone and hydrogen peroxide,successively having them characterized by X-ray diffraction(XRD)and fi eld emission scanning electron microscopy(FESEM).The synthesized VO_(2)powders were of blue color,high purity and uniform morphology with submicro-spherical structure consisted of nanorods.The diameter of the submicro-spheres was about 450~650 nm.The so-prepared VO_(2)powders were dusted onto different surfaces where to reveal the collected sweat and oily latent fi ngerprints that were compared of their development against the traditional powders.Such the nano powders brought the latent fi ngerprints to turn up their visions of high contrast,good defi nition and coherence that the fi ngerprints’detail features were shown remarkable,which can be attributed to the high selectivity and sensitivity of the VO_(2)powders to the fi ngerprint-harbored residues.Compared with the traditional powders,the VO_(2)hierarchical nano-structures developed better definition of latent fingerprints on glass slide and transparent plastic cup than did gold/silver/magnetic powder,and so did they on aluminum foil than gold/silver powder as it was deemed of their specifi c structure to play effect.In general,the smaller and more regular the size and shape of the VO_(2)nano-particle,the stronger the interaction force between the particles and fi ngerprint-harbored residues(water,grease,etc.).The VO_(2)hierarchical nano-structures demonstrated of not only characteristic of strong adsorption of nanostructured powders but also avoiding the agglomeration of nanoparticles and reducing the harm of inhaling nanopowders during operation.Moreover,their uniform spherical morphology was proved of more likely interacting with fi ngerprint-harbored residues.Conclusively,the fabric

关 键 词：指纹显现 二氧化钒 纳米材料 多级纳米结构 

分 类 号：DF794.1[政治法律—诉讼法学]