摘要
目的为了寻找显现效果好且适用性更广的汗潜手印显现材料。方法以三聚氰胺为原料,通过高温缩聚法制备了只含碳与氮两种元素且不含金属元素的碳化氮(g-C_(3)N_(4))环保型荧光纳米材料,并使用3种环糊精对材料进行修饰以优化材料吸附性及荧光性。通过傅里叶变换红外光谱仪(FTIR)、X射线衍射仪(XRD)、环境扫描电镜(FESEM)、透射电镜(TEM)、紫外光谱仪(UV-Vis)、荧光光谱仪(PL)及ZETA电位仪对材料的结构、光学性质及表面电位进行了表征。将制备的g-C_(3)N_(4)、β-CD-g-C_(3)N_(4)、HE-β-CD-gC_(3)N_(4)及HP-β-CD-g-C_(3)N_(4)荧光材料用于普通客体如载玻片、铁架台面、黑色磨砂实验台面、透明塑料表面、黑色皮革以及复杂客体如塑料包装纸、花纹瓷砖和书本封面等多种非渗透客体上的汗潜手印,并与市售红色及黄色荧光粉末的显现效果进行对比。结果g-C_(3)N_(4)、β-CD-g-C_(3)N_(4)、HE-β-CD-gC_(3)N_(4)及HP-β-CD-gC_(3)N_(4)荧光材料的激发波长为365 nm,发射波长为450 nm,材料表面为负电性,可用于多种客体上汗潜手印的显现,且显现效果良好。结论g-C_(3)N_(4)荧光材料制备方法简单,操作简便,且经过环糊精修饰后,荧光强度和吸附性增强,可有效显现多种非渗透性客体上的汗潜手印,为法庭科学手印显现材料的制备提供了一种新的思路。
Objective To find latent sweat fingermarks developing materials with better developing effect and wider applicability.Methods Carbon nitride(g-C_(3)N_(4)),an environmentally friendly fluorescent nanomaterial containing only carbon and nitrogen and no metal elements,was prepared by solid phase reaction method using melamine,and three types of cyclodextrins were used to modify the material to optimize its absorbability and fluorescence.The structure,optical properties and surface potential of the material were characterized by Fourier transform infrared spectrometer(FTIR),X-ray diffraction(XRD),Environmental scanning electron microscopy(FESEM),transmission electron microscopy(TEM),ultraviolet spectrometer(UV-Vis),fluorescence spectrometer(PL)and ZETA potentiometer analyzer.Then,the prepared g-C_(3)N_(4),β-CD-g-C_(3)N_(4),HE-β-CD-g-C_(3)N_(4) and HP-β-CD-g-C_(3)N_(4) fluorescent materials were used for the development of latent sweat fingermarks on common objects,such as glass slides,iron platforms,and black frosted experiment table,transparent plastic and black leather,complex objects include plastic paper,decorative ceramic tiles and book covers,and compared with commercially available red and yellow fluorescent powders.Results The excitation wavelength&the emission wavelength of g-C_(3)N_(4),β-CD-g-C_(3)N_(4),HE-β-CD-g-C_(3)N_(4) and HP-β-CD-g-C_(3)N_(4) fluorescent materials are 365 nm&450 nm respectively and the material surface is electronegative,which can be used for the development of latent sweat fingerprints on a variety of objects,and the development effect is perfect.Conclusion The preparation of g-C_(3)N_(4) is simple and easy to operate,and after modification with cyclodextrin,the fluorescence intensity and absorbability are enhanced,and can be used as a potential latent sweat fingerprint developing material,which provides a new idea for the preparation of fingerprint developing material in forensic science.
作者
张凌燕
刘艳
ZHANG Lingyan;LIU Yan(Criminal Investigation College of Southwest University of Political Science and Law,Chongqing 401120,China;Forensic Expertise Center of Southwest University of Political Science and Law,Chongqing 401120,China)
出处
《中国人民公安大学学报（自然科学版）》
2021年第1期10-17,共8页
Journal of People’s Public Security University of China(Science and Technology)
基金
科技部国家重点科研项目(2018YFC0830800)
重庆市科委基础研究与前沿探索项目(cstc2019jscxmsxmX0274)
西南政法大学国家毒品问题治理研究中心2019年度研究项目(DR(2019)Y005)
重庆市研究生科研创新项目(CYB19139)
西南政法大学2019年度学生科研创新项目(2019XZXS-020)。
