几种表面增强拉曼散射活性基底的比较研究

发布时间：2018-10-16 20:22

【摘要】：表面增强拉曼光谱(SERS)能够反应分子振动的特异信息,并且具有极高的灵敏度,可以到达单分子的检测水平。在表征材料的性质、反映分子结构以及研究界面性质等多个领域发挥着极其重要的作用。SERS基底的研究对SERS效应有着十分重要的意义,本文选用三种不同的SERS基底从以下三个方面展开研究,具体工作如下:1.利用经典Lee Meisel的方法合成银溶胶,并且用紫外吸收光谱表征整个银溶胶的形成过程,在成核阶段控制反应温度,进而调控合成银纳米粒子的等离子共振吸收,并且探究银纳米粒子粒径与SERS效应的关系和最低检测浓度。2.利用大尺寸的TiO_2纳米晶分别组装成TiO_2-4-MBA和TiO_2-4-MBA-Ag体系,探究在大尺寸范围内,探究SERS效应与TiO_2粒径的关系以及不同组装体系和不同激发线条件下的SERS效应差异,从而探究其增强机制和产生差异的原因。3.合成PbS纳米晶,分别以4-MBA、Mpy和PATP为探针分子,探究PbS纳米晶的SERS效应。并且通过不同探针分子构造Ag-探针分子-PbS三明治结构,通过比较不同探针分子体系SERS效应的差异来探究PbS的SERS增强机制和产生差异的原因。
[Abstract]:Surface-enhanced Raman spectroscopy (SERS) can respond to the specific information of molecular vibration and has high sensitivity, which can reach the detection level of single molecule. It plays a very important role in many fields, such as characterizing the properties of materials, reflecting the molecular structure and studying the interfacial properties. The study of SERS substrates is of great significance to the SERS effect. In this paper, three different SERS bases are selected to study from the following three aspects. The specific work is as follows: 1. Silver sol was synthesized by classical Lee Meisel method, and the formation process of silver sol was characterized by UV absorption spectrum. The reaction temperature was controlled during nucleation stage, and then the plasmon resonance absorption of silver nanoparticles was regulated. The relationship between the particle size of silver nanoparticles and the SERS effect and the lowest detectable concentration of silver nanoparticles were investigated. 2. 2. The large size TiO_2 nanocrystals were assembled into TiO_2-4-MBA and TiO_2-4-MBA-Ag systems respectively. The relationship between SERS effect and TiO_2 particle size and the difference of SERS effect under different assembly systems and different excitation lines were explored in large scale range. In order to explore its enhancement mechanism and causes of differences. 3. PbS nanocrystals were synthesized and the SERS effect of PbS nanocrystals was investigated by using 4-MBA Mpy and PATP as probe molecules respectively. The structure of Ag- probe molecule and PbS sandwich were constructed by different probe molecules, and the mechanism of SERS enhancement of PbS and the cause of the difference were discussed by comparing the difference of SERS effect in different probe molecular system.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.37

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