基于二氧化钛纳米晶的指纹显现  

Development of Latent Fingermarks Based on Titanium Dioxide Nanocrystals

作　　者：周婧 岑晓东 蔡世浩 蔡雨生 罗嘉晖 ZHOU Jing;CEN Xiaodong;CAI Shihao;CAI Yusheng;LUO Jiahui(Key Laboratory of Drug Prevention and Control Technology of Zhejiang Province and Department of Forensic Science,Zhejiang Police College,Hangzhou 310053,China)

机构地区：[1]浙江省毒品防控技术研究重点实验室浙江警察学院刑事科学技术系,浙江杭州310053

出　　处：《材料科学与工程学报》2018年第5期800-803,共4页Journal of Materials Science and Engineering

基　　金：浙江省自然科学基金资助项目(LQ16B050002);浙江省教育厅科研资助项目(Y201533271)和国家重点研发计划资助项目(2016YFC0800906)

摘　　要：本文采用溶剂热法制备得到了粒径在10～30nm的锐钛矿型二氧化钛纳米晶。紫外-可见吸收光谱显示,二氧化钛纳米晶对紫外线有很强的吸收效应,吸收边在380nm左右。将二氧化钛纳米晶均匀吸附于指纹纹线上,利用二氧化钛纳米晶对紫外光的强吸收和光散射效应,实现了彩色和白色纸张上的潜指纹显现。在350nm紫外光照射下,获得的指纹纹线呈暗色调,背景为亮色调,指纹纹线和背景反差明显,指纹纹线清晰、流畅、完整,可提供明确的纹型结构和丰富的细节特征信息,达到司法检验对指纹鉴定和细节特征标注的要求。Anatase titanium dioxide crystallites with diameter of 10-30 nm was synthesized by solvothermal method. Absorption edge of the as-prepared TiO2 nanocrystals was 380 nm according to the UV-Vis absorption spectrum. TiO2 nanopowders were evenly adsorbed on the fingermark ridges by physical contact. Visualization of latent fingermarks on color and white paper was realized based on the strong absorption and scattering of ultraviolet light of TiO2 nanocrystals. Under irradiation of 350 nm ultraviolet light, the fingermark ridges were dark, and the background was bright. Contrast between the fingerprint ridges and the background was obvious, obtaining clear, smooth and complete images of fingermarks. Abundant details and features were provided in fingermark images, achieving the requirement of labeling in judicial inspection. Development of latent fingermarks based on TiO2 nanocrystals is available for color and white fluorescent objects that often encountered in actual work, having the advantages of high efficiency, low price and applicability for various objects.

关 键 词：二氧化钛 纳米晶 紫外吸收 指纹显现 

分 类 号：DF794.1[政治法律—诉讼法学]