量子点的表面修饰与指纹检测应用

发布时间：2018-07-01 12:41

本文选题：量子点 + 指纹检测　；参考：《陕西师范大学》2010年硕士论文

【摘要】： 指纹,指人体手部皮肤表面的乳突花纹。司法工作中常说的“指纹”是指头触及物体时在表面留下的印痕。它具有人各相异,终生不变的特点,是对个人身份进行判断的主要依据之一,因此在司法侦查工作中发挥着极其重要的作用,有效的提取和显现指纹有助于对案情进行分析,排查犯罪嫌疑人,惩治犯罪。按照显现原理的不同,目前的指纹显现方法大致可分为物理显现法、化学显现法以及光学显现法等,但由于客体种类繁多,需要寻求适应不同客体的指纹显现方法,而现有显现法在实际应用中都有一些局限性,特别是显现的灵敏度需要提高,因此设法改进指纹显现方法,提高指纹显现效果是指纹研究人员的一项重要任务。量子点(QDs)是一种重要的纳米材料,有着一系列优良的物理化学性质和荧光性质,在生物、医学等很多方面有着广泛的应用,近年来也逐渐的被应用到指纹显现上,并且取得了良好的显现效果。本文首先合成了不同修饰试剂修饰的量子点,然后结合量子点的这些优点,将其应用于非渗透性客体表面指纹的显现,并对量子点进行了相关的修饰研究。本文一共分为三章。第一章为综述,主要介绍了主要的指纹检测方法、方法特点以及各自适合的客体表面,特别是对应用纳米材料显现指纹进行了详细介绍,并且提出了指纹显现的正确顺序。第二章和第三章为研究报告,主要内容如下： 1.采用水相合成法合成了巯基乙酸和谷胱甘肽包覆的CdTe@CdS量子点,考察了量子点在不同回流时间内光谱图的变化情况,并用荧光光谱、紫外吸收光谱以及透射电子显微镜对合成的量子点进行了表征。最后采用量子点溶液法对非渗透性客体表面的潜在指纹进行了显现。 2.采用水相合成法合成了L-半胱氨酸修饰的CdTe量子点,然后将其离心、干燥制成粉末,用粉末刷显法对非渗透性客体表面指纹进行了显现。而后对L-半胱氨酸修饰的量子点进行了表面修饰的初步研究,利用希夫碱的反应原理,先让L-半胱氨酸与对苯二甲醛通过希夫碱反应连接起来,而后加入L-精氨酸通过类似的反应连接上去,这样以对苯二甲醛为中间连接剂,在外端修饰剂L-半胱氨酸上连接了L-精氨酸,同时测定了量子点在修饰前后荧光性质的变化情况。
[Abstract]:Fingerprint is the mastoid pattern on the surface of the skin of the human body. "Fingerprint" often said in the judicial work is the impression left on the surface when the finger is touched. It is one of the main basis for judging personal identity, and it plays an extremely important role in the judicial investigation. The extraction and appearance of fingerprint can help to analyze the case, investigate the criminal suspects and punish the crime. According to the difference of the principle of appearance, the current fingerprint method can be divided into physical appearance method, chemical appearance method and optical appearance method, but because of the variety of the object, it is necessary to seek the fingerprint method adapted to different objects, The existing method has some limitations in practical application, especially the sensitivity of display needs to be improved. Therefore, it is an important task for fingerprint researchers to improve the method of fingerprint appearance and improve the effect of fingerprint appearance.
Quantum dots (QDs) is an important nano material. It has a series of excellent physical and chemical properties and fluorescence properties. It has been widely used in many aspects of biology and medicine. In recent years, it has been applied to the appearance of fingerprints and has achieved good results. In this paper, the quantum dots modified by different modifiers are synthesized. Then, combined with these advantages of quantum dots, it is applied to fingerprint display on the surface of impermeable objects, and the modification of quantum dots is also studied.
This article is divided into three chapters. The first chapter is a summary. It mainly introduces the main fingerprint detection methods, the characteristics of the method and the suitable object surface, especially the application of the fingerprint of nanomaterials, and puts forward the correct sequence of the fingerprints. The second and third chapters are the research reports, the main contents are as follows:
1. the CdTe@CdS quantum dots coated with mercapto and glutathione were synthesized by the method of water phase synthesis, and the changes in the spectrogram of the quantum dots during different reflux times were investigated. The quantum dots were characterized by fluorescence, UV absorption and transmission electron microscopy. Finally, the quantum dots solution method was used for the non permeability. The latent fingerprints on the surface of the object are revealed.
2. the CdTe quantum dots modified by L- cysteine were synthesized by the method of water phase synthesis. Then they were centrifuged and dried to make powder. The surface fingerprint of the non osmosis objects was revealed by the powder brushing method. The preliminary study on the surface modification of the L- cysteine modified quantum dots was carried out. The reaction principle of Schiff base was used to make L- cysteine first. Ammonia acid was linked to the reaction of benzene two formaldehyde through the Schiff base reaction and then joined by L- arginine through a similar reaction. In this way, L- arginine was connected to the L- cysteine on the outer end modifier, and the changes of the fluorescence properties of the QDs before and after the modification were measured.
【学位授予单位】：陕西师范大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：D918.91

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