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Developing multicolour light scattering rigs to understand their utility for determining nano-aggregate morphology.

开发多色光散射装置，以了解其在确定纳米聚集体形态方面的效用。

基本信息

批准号：
1948704
负责人：
金额：
--
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1948704
关键词：
Developing multicolour light scattering rigs

项目摘要

This project to extract new information from light scattering in different resonance conditions. Light scattering (both static and dynamic) gives information about the size and shape of nanoparticles in solution. However most systems to date have measured light scattering using monochromatic lasers. This can be a problem when there is a strong spectral response to the scattering, which is the case for plasmonic systems.Metallic nanostructures of Au, Ag, Cu, or Al display strong coupling to light due to their ability to support localised and propagating plasmons tethered to their surface. In particular, the gap between plasmonic components sets the dipole-dipole coupling which controls the resonant colours of light which can be trapped in between them. The enhanced optical fields lead to strong visible colouration (as resonant light is absorbed or scattered) as well as enormous enhancements in the Raman scattering from molecules within the gap (SERS). I will explore systems where light can be reliably trapped into various structures, and in particular for this project how CB molecules can bind Au nanoparticles (NPs) into aggregates. These CB:AuNP aggregates grow in time, with 0.9nm gaps between the NPs, producing red-shifting scattering and extinction resonances. The goal is threefold: to build a DLS system capable of static/dynamic scattering at different wavelengths, to calibrate the system, and understand what new information can be gained, and to study the aggregating CB:Au system, and extract new information about the process. This PhD is jointly supervised with NPL.

本计画旨在从不同共振条件下的光散射中撷取新的资讯.光散射（静态和动态）提供了关于溶液中纳米颗粒的大小和形状的信息。然而，迄今为止，大多数系统都使用单色激光测量光散射。Au、Ag、Cu或Al的金属纳米结构由于其支持束缚到其表面的局部化和传播等离子体的能力而显示与光的强耦合。特别地，等离子体元件之间的差距设置了偶极-偶极耦合，该偶极-偶极耦合控制可以被捕获在它们之间的光的共振颜色。增强的光场导致强烈的可见着色（因为共振光被吸收或散射）以及来自差距内的分子的拉曼散射（Sers）的巨大增强。我将探索光可以被可靠地捕获到各种结构中的系统，特别是对于这个项目，CB分子如何将Au纳米颗粒（NP）结合成聚集体。这些CB：AuNP聚集体随时间增长，NP之间具有0.9nm的间隙，产生红移散射和消光共振。目标有三个方面：建立能够在不同波长下进行静态/动态散射的DLS系统，校准系统，并了解可以获得哪些新信息，以及研究聚集CB：Au系统，并提取关于该过程的新信息。这个博士学位与NPL共同监督。