纳米复合材料在潜指纹显现中的应用研究

发布时间：2018-07-28 12:33

【摘要】：潜指纹识别在刑事科学、事故鉴定、信息识别和安全检查等领域具有非常重要的作用。然而,因为潜指纹客体的多样性和遗留的时效性等原由,利用传统的方法对潜指纹进行显现和提取有时无法取得满意效果。鉴于以上情况,近年来研究人员尝试使用纳米荧光材料作为指纹显现提取试剂,寻求基于纳米荧光材料的简单、廉价、高效、低干扰和多重信号的指纹显现和检测。本文利用简单化学制备方法合成了CdTe@SiO2/Ag抗菌发光纳米复合材料、“银粉”-CdTe@SiO2双显现纳米复合发光材料以及Fe3O4-CdTe@SiO2磁性发光纳米复合材料,并系统研究其检测潜指纹的应用。所合成的CdTe@SiO2/Ag抗菌发光纳米复合材料、“银粉"-CdTe@SiO2以及Fe3O4-CdTe@SiO2磁性发光纳米复合材料具有制备方法简单、吸附能力强、背景干扰小、可检测客体多等特点,.具有良好的指纹显现效果。每种材料又具备双重功能,实现了多重检测信号,提升了指纹显现适用范围,因此,在刑事科学指纹显现和提取领域具有重要的应用前景。本文第一章为绪论,主要介绍潜指纹特点和传统指纹显现提取手段,同时还对纳米复合材料进行综述,进而提出论文的选题依据、研究思路与研究内容。本文第二章设计合成了CdTe@SiO2/Ag抗菌发光纳米复合材料。采用X-射线衍射、扫描电子显微镜、透射电子显微镜、红外光谱、X射线光电子能谱、荧光光谱和抗菌性能测试等分析手段,研究了CdTe@SiO2/Ag抗菌发光纳米复合材料的结构和抗菌发光性能,并探索了其对不同客体遗留的潜指纹的显现和提取效果。研究结果表明,CdTe@SiO2/Ag纳米复合材料具备较好的抗菌效果,同时对多种客体表面遗留指纹具有较好的显现效果。本文第三章设计合成了“银粉’'-CdTe@SiO2双显现纳米复合发光材料。经X-射线衍射、扫描电子显微镜、透射电子显微镜和荧光光谱等测试手段,对比传统指纹显现用“银粉”配比不同时“银粉”-CdTe@SiO2双显现纳米复合发光材料的结构特点、荧光特点和指纹显现提取效果。研究结果表明,“银粉”的添加量对“银粉”-CdTe@SiO2双显现纳米复合发光材料的形貌和荧光性质有一定影响。和商用“银粉”比较,“银粉”-CdTe@SiO2双显现纳米复合发光材料具有更强的粘附性能和显现提取效果,可在紫外光下通过指纹荧光显现和可见光下对潜指纹实现双重功能的识别。本文第四章设计合成了Fe3O4-CdTe@SiO2磁性发光纳米复合材料。利用X-射线衍射、扫描电子显微镜、透射电子显微镜和荧光光谱等分析手段,研究了Fe3O4-CdTe@SiO2磁性发光纳米复合材料的结构特点、磁性能和发光性能,探究了其对多种客体遗留潜指纹的显现提取效果。研究表明,Fe304纳米粒子的添加量对Fe3O4-CdTe@SiO2磁性发光纳米复合材料的形貌和发光特性有一定影响。相比于传统试剂,Fe3O4-CdTe@SiO2磁性发光纳米复合材料具有较强的粘附能力和更好的潜指纹显现提取结果,同时可实现磁分离回收,因而具有较好的应用前景。本文第五章对论文研究进行了总结,并对后续进一步研究进行了展望。
[Abstract]:Latent fingerprint identification plays a very important role in the fields of criminal science, accident identification, information recognition and security inspection. However, because of the diversity of the objects and the legacy of the latent fingerprint, the use of traditional methods to reveal and extract the latent fingerprint can not achieve satisfactory results. People try to use nanofluorescence materials as a fingerprint to extract reagents, and seek the simple, cheap, efficient, low interference and multiple signal fingerprint and detection based on nanofluorescence materials. In this paper, a simple chemical preparation method is used to synthesize CdTe@SiO2/Ag antibacterial luminescent nanocomposites. "Silver powder" -CdTe@SiO2 double show nano complex. The application of CdTe@SiO2/Ag antibacterial luminescent nanocomposites, "silver powder" -CdTe@SiO2 and Fe3O4-CdTe@SiO2 magnetic luminescent nanocomposites has simple preparation method, strong adsorption capacity and small background interference, which can be detected by the synthesis of luminescent materials and Fe3O4-CdTe@SiO2 magnetic luminescent nanocomposites. It has the characteristics of many objects. It has a good effect of fingerprint appearance. Each material has dual functions. It realizes multiple detection signals and improves the application scope of fingerprint. Therefore, it has an important application prospect in the field of fingerprint appearance and extraction in criminal science. The first chapter is introduction, which mainly introduces the characteristics of latent fingerprints and traditional fingerprints. The second chapters of this paper are designed and synthesized in the second chapter of this paper, including X- ray diffraction, scanning electron microscopy, penetrating electron microscopy, infrared spectroscopy, and X ray photoelectron spectroscopy. The structure and antibacterial luminescence properties of CdTe@SiO2/Ag antibacterial luminescent nanocomposites were studied by means of fluorescence spectra and antibacterial properties test. The appearance and extraction effect of the latent fingerprints left by different objects were explored. The results showed that the CdTe@SiO2/Ag nanocomposites had better antibacterial effects and had a variety of guests at the same time. The third chapter of this paper has been designed and synthesized in the third chapter of this paper. The "silver powder" double display nano composite luminescent materials are synthesized by X- ray diffraction, scanning electron microscope, transmission electron microscope and fluorescence spectrum, and the traditional fingerprint shows that silver powder "silver powder" is not at the same time as "silver powder" -CdTe The structure characteristics, fluorescence characteristics and fingerprint extraction effect of @SiO2 double display nano composite luminescent materials have been found. The results show that the amount of "silver powder" has a certain effect on the morphology and fluorescence properties of "silver powder" -CdTe@SiO2 double display nanocomposite luminescent materials. Compared with commercial "silver powder", "silver powder" -CdTe@SiO2 double display The composite luminescent materials have stronger adhesion and appearance, which can be identified by fingerprint fluorescence and visible light under UV light. In the fourth chapter, Fe3O4-CdTe@SiO2 magnetic luminescent nanocomposites are designed and synthesized. X- ray diffraction, scanning electron microscope and transmission electron are used in this paper. The structural characteristics, magnetic properties and luminescence properties of Fe3O4-CdTe@SiO2 magnetic luminescent nanocomposites were investigated by means of microscope and fluorescence spectroscopy, and the effect of its appearance on the latent fingerprint of various objects was explored. The study shows that the addition of Fe304 nanoparticles to the morphology of Fe3O4-CdTe@SiO2 magnetic luminescent Nanocomposites Compared with the traditional reagents, Fe3O4-CdTe@SiO2 magnetic luminescent nanocomposites have strong adhesion and better latent fingerprint extraction results, and can achieve magnetic separation and recovery. Therefore, it has a good application prospect. The fifth chapter of this paper has been summarized and further further studied. The research has been prospected.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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