YVO4:Eu发光纳米悬浮液在手印显现中的应用  

YVO4:Eu luminescent nanosuspensions for latent fingerprint development

作　　者：李明 LI Ming(Department of Trace Examination,National Police University of China,Shenyang 110035,China;Key Laboratory of Impression Evidence Examination and Identification Technology,Ministry of Public Security,Shenyang 110035,China)

机构地区：[1]中国刑事警察学院痕迹检验技术系,辽宁沈阳110035 [2]痕迹检验鉴定技术公安部重点实验室,辽宁沈阳110035

出　　处：《化学研究与应用》2020年第7期1207-1213,共7页Chemical Research and Application

基　　金：国家自然科学基金青年科学基金项目(21205139,21802169)资助;公安部科技强警基础工作专项项目(2014GABJC033,2018GABJC07,2018GABJC09)资助;痕迹检验鉴定技术公安部重点实验室开放课题(2018121704)资助。

摘　　要：以稀土氯化物和原钒酸钠为反应物、柠檬酸为修饰剂,利用共沉淀法在水相体系中合成出具有红色发光性能的YVO4:Eu纳米材料,并对纳米材料的微观形貌、晶体类型、发光性能、表面性质进行表征。将YVO4:Eu纳米发光材料、非离子表面活性剂聚氧乙烯山梨醇单油酸酯80(Tween 80)、水按照一定比例配制成纳米悬浮液喷剂,并将其应用于陈旧手印的显现技术中。本研究还对纳米悬浮液中Tween 80的浓度及手印显现时间进行了优化。手印显现结果表明,在254 nm紫外光的照射下,手印与客体之间的对比反差明显,纹线完整连贯、细节特征明显。该显现方法可用于光滑非渗透性客体表面陈旧手印的高质量显现,其显现效果优于传统小颗粒悬浮液的显现效果。Rare earth doped YVO4:Eu nanomaterials with red fluorescence were synthesized via a coprecipitation approach in aqueous system,using rare earth chloride and sodium orthovanadate as reactants and citric acid as modifier.The micromorphology,crystal structure,optical and surface properties of the as-synthesized fluorescent nanomaterials were also characterized.The luminescent nanosuspension spray were prepared by mixing YVO4:Eu nanomaterials,nonionic surfactant polyoxyethylene sorbitan monooleate 80(Tween 80)and water in proportion,and then used for aged latent fingerprint development.In addition,the optimal volume concentration of Tween 80 and optimal developing time were also studied in detail.The results showed that,under excitation of 254 nm ultraviolet light,the contrast between the developed fingerprints and corresponding substrates were strong enough,and the ridges were coherent,even the minutiae features could be clearly reflected.Compared with some traditional used small particle reagents,our proposed method based on YVO4:Eu luminescent nanosuspensions couldexhibit better results,which could be applied to develop aged latent fingerprints on smooth nonporous surfaces with high quality.

关 键 词：手印显现 稀土 荧光 纳米材料 喷剂 

分 类 号：O657.3[理学—分析化学]