银纳米颗粒等离子体共振增强荧光研究

发布时间：2018-04-02 01:06

本文选题：稀土发光材料　切入点：银纳米颗粒　出处：《青岛科技大学》2015年硕士论文

【摘要】：荧光纳米材料具有优越的发光性能,广泛应用于照明设备、显示器、生物标记、显微成像、医学研究以及临床诊断等领域。银(Ag)纳米颗粒表面等离子体共振具有光定位、强吸收以及强局域场等优点,广泛应用于表面增强拉曼散射(SERS)和金属增强荧光(MEF)等相关领域,其与荧光材料复合而成的纳米结构具有优异的光学性能以及高稳定性。本文制备了银核壳纳米颗粒和银纳米颗粒自组装薄膜,研究了其表面等离子体共振对荧光材料发光性能的影响。对金属表面等离子体共振增强荧光(MEF)的应用展开了初步探索。主要分为以下三部分内容：1.采用沉淀法和水热法合成了Tb3+和Eu3+掺杂的LaF3纳米颗粒,通过TEM、 XRD、FTIR和荧光光谱测试等分析方法,分别研究了掺杂浓度、反应时间、稳定剂以及pH值对荧光性能的影响。2.研究Ag纳米颗粒等离子体共振对于LaF3:Tb3+/Eu3+纳米材料荧光性能的影响。设计Ag@SiO2@LaF3:Tb3+/Eu3+核壳纳米颗粒和LaF3:Tb3+/PVA/Ag薄膜两种结构,分别通过改变Si02隔层厚度和PVA浓度来控制Ag纳米颗粒与LaF3: Tb3+/Eu3+荧光材料之间的距离,讨论了荧光增强与猝灭两种机理。3.设计合成Ag@SiO2-DNA-Cy3荧光探针,讨论了SiO2隔层厚度对荧光性能的影响。利用这种荧光探针实现了对Hg2+的检测。结果显示此荧光探针具有良好的灵敏性和选择性。
[Abstract]:Fluorescent nanomaterials have excellent luminescence properties and are widely used in lighting devices, displays, biomarkers, microscopic imaging, medical research and clinical diagnosis.Surface plasmon resonance (SPR) of silver silver nanoparticles has been widely used in many related fields such as surface enhanced Raman scattering (SERS) and metal enhanced fluorescence (MEF) due to the advantages of light localization, strong absorption and strong local field.The nanostructures synthesized with fluorescent materials have excellent optical properties and high stability.Silver core-shell nanoparticles and silver nanoparticles self-assembled thin films were prepared in this paper. The effect of surface plasmon resonance (SPR) on the luminescence properties of fluorescent materials was investigated.The application of metal surface plasmon resonance enhanced fluorescence (MEF) was preliminarily explored.It is divided into the following three parts: 1.LaF3 nanoparticles doped with Tb3 and Eu3 were synthesized by precipitation and hydrothermal methods. The effects of doping concentration, reaction time, stabilizer and pH value on the fluorescence properties were studied by means of TEM, XRDX FTIR and fluorescence spectroscopy.The effect of plasma resonance (PSR) of Ag nanoparticles on the fluorescence properties of LaF3:Tb3 / EU3 nanomaterials was investigated.The structure of Ag@SiO2@LaF3:Tb3 / EU3 core-shell nanoparticles and LaF3:Tb3 / PVA / Ag films were designed. The distance between Ag nanoparticles and LaF3: Tb3 / EU3 fluorescent materials was controlled by changing the thickness of Si02 interlayer and the concentration of PVA, respectively. The fluorescence enhancement and quenching mechanisms were discussed.Ag@SiO2-DNA-Cy3 fluorescence probe was designed and synthesized, and the influence of the thickness of SiO2 interlayer on the fluorescence performance was discussed.The fluorescence probe was used to detect Hg2.The results show that the fluorescence probe has good sensitivity and selectivity.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;O614.122

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