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首页> 外文学位 >Localized surface plasmon resonance spectroscopy of silver nanoparticles and Raman spectroscopy using liquid-core optical fibers: Fundamentals and applications.
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Localized surface plasmon resonance spectroscopy of silver nanoparticles and Raman spectroscopy using liquid-core optical fibers: Fundamentals and applications.

机译：银纳米颗粒的局部表面等离子体激元共振光谱和使用液芯光纤的拉曼光谱：基本原理和应用。

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The localized surface plasmon resonance (LSPR) of silver nanoparticles fabricated using the technique of nanosphere lithography (NSL) is examined using optical extinction spectroscopy. In the first section of this document, we demonstrated that the wavelength corresponding to the extinction maximum, lambdamax, can be systematically tuned throughout the visible, near-infrared, and mid infrared regions of the electromagnetic spectrum. This unprecedented level of wavelength agility in nanoparticle optical response was achieved by independent manipulation of the nanoparticle height, width, shape, and dielectric environment.; A detailed study of the LSPR of Ag nanoparticles chemically modified with alkanethiols, CH3(CH2)xSH, of varying chain length x = 3--15 is also presented. The significant discovery from this investigation is that lambdamax is extremely sensitive to the presence of adsorbed alkanethiol molecules. Using this discovery, we created a new class of nanosensors that operate by detecting shifts in the LSPR induced by analyte binding events to Ag nanoparticles modified with functionalized self-assembled monolayers.; Additionally, we explored the optical contribution of the substrate to the LSPR of surface confined Ag nanoparticles. For this study, the spectral location of the LSPR in a controlled N2 environment and the LSPR sensitivity to bulk external solvent were measured for Ag nanoparticles fabricated on four different substrates with refractive indices, n substrate, from 1.46 to 1.73. In a controlled N2 environment, lambda max linearly shifted to the red with increasing n substrate. However, little or no systematic dependence correlating the LSPR sensitivity to bulk environment to nsubstrate was observed.; The final chapter of this document described the development of a method that estimates and optimizes the utilizable Raman power delivered by a liquid-core optical fiber (LCOF) waveguide to a spectroscopic instrument. Expressions for the effective fiber length, ze, which is directly proportional to the Raman intensity, were derived for six commonly used scattering configurations. Also, the "Figure of Merit", a term describing the fraction of the Raman light emitted from the LCOF that enters the spectroscopic instrument, is discussed. For a conventional Raman instrument, we concluded that the "Figure of Merit" is inversely proportional to the inner diameter and loss coefficient of the LCOF.
机译：使用消光光谱法检查了使用纳米球光刻技术（NSL）制造的银纳米颗粒的局部表面等离子体共振（LSPR）。在本文档的第一部分中，我们证明了与消光最大值lambdamax相对应的波长可以在电磁光谱的可见，近红外和中红外区域进行系统调谐。通过对纳米粒子的高度，宽度，形状和介电环境进行独立控制，可以实现纳米粒子光学响应中前所未有的波长敏捷性。还提供了对链长为x = 3--15的链烷硫醇CH3（CH2）xSH化学修饰的Ag纳米颗粒的LSPR的详细研究。这项研究的重要发现是，lambdamax对吸附的烷硫醇分子的存在极为敏感。利用这一发现，我们创建了一种新型的纳米传感器，其工作原理是通过检测分析物与功能化自组装单分子层修饰的Ag纳米粒子的结合事件所引起的LSPR的变化。此外，我们探索了基底对表面受限的银纳米粒子的LSPR的光学贡献。在本研究中，对在四种折射率为n的不同基板上（1.46至1.73）制作的Ag纳米粒子，测量了在受控N2环境中LSPR的光谱位置以及LSPR对大量外部溶剂的敏感性。在受控的N2环境中，随着n底物的增加，λmax线性移至红色。然而，几乎没有或没有系统性的依赖关系将LSPR敏感性与整体环境与n底物相关联。本文档的最后一章描述了一种方法的开发，该方法可估计和优化由液芯光纤（LCOF）波导传递给光谱仪的可利用拉曼功率。有效纤维长度ze的表达式与拉曼强度成正比，它是针对六个常用的散射配置得出的。另外，讨论了“品质因数”，该术语描述了从LCOF射入光谱仪的拉曼光的份额。对于常规的拉曼仪器，我们得出的结论是，“品质因数”与LCOF的内径和损耗系数成反比。

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