量子点的表面修饰与指纹检测应用
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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。
Fingerprint, is the nipple pattern of human hand skin surface, and it refers to the marks by fingers touching some objects in the judicial work. Because of its unique and lifelong unchanged characteristics, it is a main basis to judge individual identification. So it plays an extremely important role in judicial investigation and case analysis, and it can help testing and punishing crimes suspects when fingerprints were developed well. According to developing principle, current fingerprint developing methods include physical method, chemical method and optical method. However, these methods have some limitations in the application, and the objects are various, so it needs to seek methods to develop fingerprints on different surfaces. And it is also an important task for fingerprinting researchers to study fingerprint developing methods and improve the detection effect.
Quantum Dots (QDs) is an important nanometer material. It has a series of excellent physical and chemical properties and fluorescence properties and was widely applied in biology, medicine, etc. Recently, it was gradually applied in fingerprint detection and achieved good effect. Firstly, we synthesized QDs modified by different reagents, then these QDs were applied to detected fingerprints on non-porous surfaces based on their advantages, and we also made some surface modifications to the QDs.
Three chapters are included in this thesis. The first chapter is review, mainly introduced the main methods of fingerprint detection and the characteristics of these methods, especially the application of nanometer materials in fingerprint detection was discussed. The second chapter and the third chapter are research reports, and the main contents are as follows:
1. CdTe@CdS QDs modified by thioglycolic acid and glutathione was prepared in aqueous solution. The synthesized CdTe@CdS QDs was characterized by transmission electron microscopy, fluorescent spectrometry and uv-vis absorption spectrometry respectively. And we also studied the spectrogram variation of CdTe@CdS QDs in different refluxing time. Finally, we used QDs solution to detect latent fingerprints on non-porous surfaces.
2. L-cysteine modified CdTe QDs was prepared in aqueous solution. Then it was centrifugated and dried, and the dried power was used to detect latent fingerprints. Based on the reaction principle of Schiff base, we made a surface modification to CdTe QDs, and as a result, L-cysteine was connected with L-arginine through p-phthalaldehyde. We also examined variation of the fluorescence properties after QDs was modified.
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。
Fingerprint, is the nipple pattern of human hand skin surface, and it refers to the marks by fingers touching some objects in the judicial work. Because of its unique and lifelong unchanged characteristics, it is a main basis to judge individual identification. So it plays an extremely important role in judicial investigation and case analysis, and it can help testing and punishing crimes suspects when fingerprints were developed well. According to developing principle, current fingerprint developing methods include physical method, chemical method and optical method. However, these methods have some limitations in the application, and the objects are various, so it needs to seek methods to develop fingerprints on different surfaces. And it is also an important task for fingerprinting researchers to study fingerprint developing methods and improve the detection effect.
Quantum Dots (QDs) is an important nanometer material. It has a series of excellent physical and chemical properties and fluorescence properties and was widely applied in biology, medicine, etc. Recently, it was gradually applied in fingerprint detection and achieved good effect. Firstly, we synthesized QDs modified by different reagents, then these QDs were applied to detected fingerprints on non-porous surfaces based on their advantages, and we also made some surface modifications to the QDs.
Three chapters are included in this thesis. The first chapter is review, mainly introduced the main methods of fingerprint detection and the characteristics of these methods, especially the application of nanometer materials in fingerprint detection was discussed. The second chapter and the third chapter are research reports, and the main contents are as follows:
1. CdTe@CdS QDs modified by thioglycolic acid and glutathione was prepared in aqueous solution. The synthesized CdTe@CdS QDs was characterized by transmission electron microscopy, fluorescent spectrometry and uv-vis absorption spectrometry respectively. And we also studied the spectrogram variation of CdTe@CdS QDs in different refluxing time. Finally, we used QDs solution to detect latent fingerprints on non-porous surfaces.
2. L-cysteine modified CdTe QDs was prepared in aqueous solution. Then it was centrifugated and dried, and the dried power was used to detect latent fingerprints. Based on the reaction principle of Schiff base, we made a surface modification to CdTe QDs, and as a result, L-cysteine was connected with L-arginine through p-phthalaldehyde. We also examined variation of the fluorescence properties after QDs was modified.
引文
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