摘要
指印是犯罪现场常见的痕迹物证之一,为了提升现场勘查效率,丰富潜在指印显现提取方法,探究表面自由能对聚集诱导发光(AIE)材料显现潜在指印提取的影响。选择12种常见呈痕客体上遗留的油潜和汗潜指印为研究对象,利用AIE材料结合光学技术显现指印,基于表面自由能差异评价指印显现效果。实验结果表明,AIE技术显现的指印普适性强,阳离子型的AIE分子和带有阴离子的生物大分子(氨基酸等)在静电作用下特异性结合,在470 nm的蓝光下发出黄色荧光。指印与客体之间的表面自由能决定了AIE分子的吸附能力,表面能越强的区域AIE分子的吸附作用就越强,荧光强度也会越高,显现效果越好。但同时承痕客体性质、表面颜色、指印物质和环境污染都会影响指印和客体表面能,进而影响指印的显现结果。
Fingerprints are one of the common trace physical evidence at crime scenes.To improve the efficiency of on-site investigation,the extraction methods for potential fingerprint display are enhanced,and the impact of surface free energy on the aggregation-induced emission(AIE)material for potential fingerprint extraction is explored.Twelve common types of oil and sweat latent fingerprints left on the marked objects are selected as research objects.AIE materials,combined with optical technology,are used to display fingerprints,and the display effect of fingerprints are evaluated based on surface free energy differences.The experimental results show that the AIE technology exhibits strong universality in displaying fingerprints.Cationic AIE molecules and anionic biological macromolecules(such as amino acids)bind specifically under electrostatic action,emitting yellow fluorescence under 470 nm of blue light.The surface free energy between the fingerprint and the object determines the adsorption ability of AIE molecules.Stronger surface energy leads to stronger adsorption effect of AIE molecules.Furthermore,the higher the fluorescence intensity,the better the display effect.However,at the same time,the properties of the imprinted object,surface color,fingerprint substances,and environmental pollution can affect the surface energy of fingerprints and the object,thereby affecting the appearance results of fingerprints.
作者
郭凌杰
高树辉
Guo lingjie;Gao Shuhui(Beijing Key Laboratory of Forensic Science,People’s Public Security University of China,Beijing 100038,China;School of Investigation,People’s Public Security University of China,Beijing 100038,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2024年第15期368-375,共8页
Laser & Optoelectronics Progress
基金
刑事科学技术北京市重点实验室建设项目(2023ZB06)。
关键词
聚集诱导发光
表面能
潜在指印
光学显现
aggregation-induced emission
surface energy
latent fingerprint
optical revelation
