ZnS和ZnS:Cu无机紫外荧光材料的制备及其在汗潜手印显现中的应用  

ZnS and ZnS:Cu Inorganic Ultraviolet Fluorescent Materials:Preparation and Developability into Sweat Latent Fingermarks

作　　者：刘艳[1] 马煜 王霄 LIU Yan;MA Yu;WANG Xiao(School of Public Security,Northwest University of Political Science and Law,Xi’an 710122,China)

机构地区：[1]西北政法大学公安学院,西安710122

出　　处：《刑事技术》2021年第1期40-45,共6页Forensic Science and Technology

基　　金：陕西省科技厅项目(2019JQ-858);陕西省教育厅项目(19JK0876);西北政法大学教改资助项目(XJY201838);大学生创新项目(xfd2019398)。

摘　　要：目的制备荧光强度高、客体适用性广、显现效果优良且合成方法简单的ZnS及ZnS:Cu无机紫外荧光材料,并将其用于汗潜手印的显现。方法通过一步溶液反应共沉淀法制备ZnS无机紫外荧光材料,并在ZnS材料中加入Cu^2+得到ZnS:Cu以改善荧光性质,将其应用于普通客体(白色捺印纸、载玻片、铁架台、乳白色花纹瓷砖表面、磨砂化学实验台面、不锈钢表面)和复杂客体(拼色花纹瓷砖、农夫山泉塑料标签和杂志封面铜版纸)上汗潜手印的显现,并与传统荧光粉末显现效果进行对比。结果ZnS材料具有荧光性,并且在ZnS材料中掺杂Cu^2+后得到的ZnS:Cu材料荧光强度增强,荧光光谱范围变广,稳定性提升。显现汗潜手印时,适用客体范围更广,并且可通过调节激发光的波长呈现不同的显现效果。结论通过在无机荧光材料ZnS中掺杂Cu^2+可改善材料的荧光范围,从而得到适用于不同客体上汗潜手印显现且效果更好的ZnS:Cu无机紫外荧光材料。Objective To prepare the ZnS and ZnS:Cu inorganic ultraviolet(UV)fluorescent materials for developing sweat latent fingermarks based on their putative high fluorescence intensity,wide-object applicability,excellent handprint visualization and simple fabrication.Methods Through one step liquid-phase coprecipitation reaction,ZnS was prepared via the reaction of zinc acetate with sodium sulfide,so was ZnS:Cu from addition of sodium sulfi de into the mixture of zinc acetate plus copper chloride(Cu^2+is to improve the fluorescent property of the fabricated ZnS material),therewith resulting in having the two inorganic UV fluorescent materials produced.With such two above-prepared materials,latent sweat fingerprints were developed on various common substrates(white stamping paper,glass slide,iron-rack plane,white-tile lined surface,matte countertop,stainless steel surface)and the complex ones(color-mixed patterned tile,beverage bottle’s label plastic sheet and magazine’s copper-coated cover).The fingerprint visualization was also compared against the conventional phosphorpowder method.Results ZnS is an inorganic UV fluorescent material,and its modified version of ZnS:Cu demonstrated the prominence of enhanced fluorescence intensity,stronger stability,and wider scope of emission wavelength spectrum so that it is able to develop sweat latent fingerprints on more various substrates,exhibiting different effects along with the adjustment of wavelength of the excitation light.Conclusions The inorganic fluorescent material ZnS and its modified version ZnS:Cu can develop sweat latent fingermark on different objects,with the latter owning better developability.

关 键 词：一步溶液反应共沉淀法 ZnS及ZnS:Cu 无机紫外荧光粉 汗潜手印 显现 

分 类 号：DF794.1[政治法律—诉讼法学]