埃及蓝矿物质颜料荧光光谱测定及其在指印显现中的应用  

Study on the Fluorescence Spectral Characteristics of Egyptian Blue Mineral Pigment and Their Application in Development of Latent Fingerprints

作　　者：代雪晶[1] 汤澄清[2] 李云鹏[1] 宋佳 DAI Xue-jing;TANG Cheng-qing;LI Yun-peng;SONG Jia(College of Public Security Information Technology,Criminal Investigation Police University of China,Shenyang 110035,China;College of Forensic Sciences,Criminal Investigation Police University of China,Shenyang 110035,China)

机构地区：[1]中国刑事警察学院公安信息技术与情报学院,辽宁沈阳110035 [2]中国刑事警察学院刑事科学技术学院,辽宁沈阳110035

出　　处：《光谱学与光谱分析》2025年第5期1383-1388,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(62305397);公安部科技强警基础工作专项项目(2023JC08);中央高校基本科研业务费项目(D2023001,D2024002)资助。

摘　　要：对犯罪嫌疑人遗留的指印进行提取和鉴定是侦破案件的重要依据。绝大部分荧光粉末需要在紫外线或蓝绿光激发照射下产生荧光,但是有些多色承痕体背景因为有墨水、粘合剂、涂料等物质,在紫外线或蓝绿光的激发照射下也会产生荧光,从而与粉末指印的荧光在颜色或者亮度上接近而难以获得较好的反差。此外,常用的粉末对长期从事指印显现的工作人员身体有较大的毒副作用。因此寻找一种能够适用于疑难承痕体的并且无毒无害的荧光粉末是当务之急。该文研究了无毒无害、成本低廉的天然埃及蓝矿物质颜料的荧光性能。采用扫描电子显微镜、X射线衍射谱、荧光光谱、傅里叶变换红外光谱对该埃及蓝矿物质颜料的微观形貌、晶体结构、发光性能、表面基团进行表征。埃及蓝矿物质颜料其分散性良好、平均粒径为1μm左右,其主要成分为CuO和Cu2O的混合物,在780 nm红外线激发下能够发射823 nm红外线,是一种含有铜离子的硅酸盐混合物。最终将埃及蓝矿物质颜料应用于犯罪现场常见的复杂背景干扰的汗潜指印显现中。实验结果表明,指印纹线与背景反差强烈,纹线清晰连贯,消除了复杂背景的干扰。另外,埃及蓝矿物质颜料的激发光谱和发射光谱都在近红外区域,填补了荧光粉末显现指印方法的空白。The development and identification of the fingerprints left by the suspects are the important basis for detecting cases.The majority of commercially available luminescent fingerprint powders can usually fluoresce upon excitation with ultraviolet(UV)light or blue and green light.Still,multi-colored and patterned backgrounds have intrinsic formulations(inks,binders,coatings,etc.),which also cause them to fluoresce within the same spectrum area.This creates a lack of distinguishing ability between the fluorescence of the developed latent fingerprint and the background.In addition,-most fluorescent powders have seriously damaged the long-term health of forensic technicians.Therefore,it is urgent to find a kind of non-toxic fluorescent fingerprint power suitable for use on substrates that are typically considered extremely difficult to treat.In this paper,the fluorescence properties of the natural Egyptian blue mineral pigment,which was harmless and cheap,were studied.The micro-morphology,crystal structure,luminescence properties,and surface functional groups of the Egyptian blue mineral pigment were characterized by scanning electron microscopy,X-ray diffractometer,fluorescence spectrophotometer,and Fourier transform infrared spectrometer.The Egyptian blue mineral pigment had good dispersion with anaverage diameter of about 1μm,and its main component was a mixture of CuO and Cu2O.Under the excitation of 780 nm infrared,it could give strong emissions at the wavelength of 823 nm infrared.It was a silicate mixture containing copper ions.Finally,the Egyptian blue mineral pigment was used to develop the latent fingerprints on extremely troublesome substrates commonly encountered at crime scenes.The experimental results showed a high contrast between the fingerprint and the background with fine ridge detail and less interference.In addition,the excitation and emission spectra of the Egyptian blue mineral pigment were in the near-infrared region,which filled the blank of the method of developing fingerprints with fluoresce

关 键 词：指印显现 埃及蓝矿物质颜料 近红外 荧光 背景干扰 

分 类 号：DF794.1[政治法律—诉讼法学]