蝶翅分级结构辅助银纳米颗粒镀层制备及其对表面增强拉曼散射（SERS）的优化

发布时间：2018-10-13 18:53

【摘要】：近些年来,表面增强拉曼散射已经越来越受到人们的关注,由于其可以实现对物质的痕量检测。但是由于对基底制备的方法并不完善,使之限制了其更快速的发展。近些年来,研究者们不断提出新的制备思路,逐步完善改进了这一缺陷,但是所达到的增强效果并不是非常显著。大自然在一万年的进化过程中形成了一些精妙的三维微结构,这些结构可以实现对特定波段频率光的响应,本文正是“师法自然”,受到大自然的启迪,将银纳米颗粒附着在一些具有典型的蝴蝶鳞片结构上,使之规则的排布在这样具有特殊光响应的结构上,从而来实现对拉曼信号峰的增强。本文分别用绿带翠凤蝶和“夜光蓝”蝴蝶翅膀作为基板,通过原位自生长方法,成功的将纳米银金属颗粒附着在这样的三维微结构上,合成了经有序粗糙化的SERS基底。拉曼检测结果显示:在以绿带翠凤蝶为基板的增强基底上,可以检测到浓度为10-14mol/L的罗丹明6G,而以“夜光蓝”蝶翅为基板的增强基底上只能检测到浓度为10-11mol/L的罗丹明6G。在对同等浓度为10-8mol/L的罗丹明6G的增强中,从信号峰强度上来看,这样的三维粗糙化的要比排布在二维平板上的银纳米颗粒有显著增强。在实验的基础上,结合三维有限时域差分的计算方法(3-D FDTD),模拟研究了在这样的微结构上排布银纳米颗粒对周围表面电磁场强度的影响,以及从对光利用的角度分析了绿带翠凤蝶增强效果强的原因。模拟计算结果表明这样的三维微结构经有序粗糙化后可以使表面的电场强度有显著增强,数量级可以达到103。通过降低对激发光的反射,来提高其与银纳米颗粒的能量交换,继而达到对电场增强的效果。本文为设计更高效的表面增强拉曼散射基底材料提供了启迪。
[Abstract]:In recent years, surface enhanced Raman scattering has attracted more and more attention because of its ability to detect trace substances. However, the method of substrate preparation is not perfect, which limits its rapid development. In recent years, researchers put forward new preparation ideas, gradually improve the defect, but the enhancement effect is not very significant. In the course of ten thousand years of evolution, nature has formed some exquisite three-dimensional microstructures which can respond to the frequency light of a certain band. This paper is just "learning from nature", which is inspired by nature. The silver nanoparticles are attached to some typical butterfly scales, which are arranged regularly in the structure with special light response, so that the Raman signal peak can be enhanced. In this paper, the SERS substrates were synthesized by using the wings of the green belt butterflies and the "night-blue" butterflies as substrates. The silver nanoparticles were successfully attached to the three-dimensional microstructures by in situ self-growth method. Raman analysis showed that Rhodamine 6G with 10-14mol/L concentration could be detected on the enhanced substrate with green belt butterflies as substrate, while Rhodamine 6G with 10-11mol/L concentration could only be detected on enhanced substrate with "night-light blue" butterfly wings as substrate. In the enhancement of Rhodamine 6G with the same concentration of 10-8mol/L, the intensity of the signal peak shows that the three-dimensional roughening is more obvious than that of the silver nanoparticles arranged on the two-dimensional plate. On the basis of experiments, the influence of silver nanoparticles on the electric magnetic field intensity of the surrounding surface was studied by 3-D FDTD), simulation. And from the perspective of light utilization, the paper analyzes the reasons for the strong enhancement effect of the green belt butterflies. The simulation results show that the electric field intensity of the surface can be significantly enhanced by the ordered roughening of the three dimensional microstructures, and the order of magnitude can reach 103. The energy exchange with silver nanoparticles can be improved by reducing the reflection of excited light, and the effect of electric field enhancement can be achieved. This paper provides inspiration for the design of more efficient surface-enhanced Raman scattering substrates.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O614.122;TB383.1

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