Electron spin resonance and nuclear magnetic resonance spectroscopy of organic semiconductors

有机半导体的电子自旋共振和核磁共振波谱

• 批准号: 2276498
• 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: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2276498
• 关键词: Electron; spin; resonance; nuclear; magnetic

The aim of the proposed project is to develop a fundamental understanding of the mechanisms for electron and nuclear spin relaxation in organic semiconductors in the solid state as well as to develop methods for characterising the coupling between electron and nuclear spins in these materials. Mechanisms for electron spin relaxation are currently not well understood, in particular the relative importance of hyperfine and spin-orbit interaction induced relaxation mechanisms as well as the nature of the relevant dynamic processes which generate the time-varying magnetic fields that can induce spin-flips. Phenomena like the Overhauser effect or DNP remain largely unexplored in these materials. In the project you will develop a DNP method for characterizing organic semiconductors and their conformation and local microstructure in thin films samples, as well as explore novel physical phenomena in these materials based on controlling electron - nuclear spin interactions that could potentially be exploited in applications such as energy storage, spintronics or quantum information processing. The project is mainly an experimental project based on combining electron spin resonance (ESR) and nuclear magnetic resonance (NMR) spectroscopy measurements available in the Cavendish Laboratory and the Department of Chemistry as well as dynamic nuclear polarisation (DNP) measurements; the project will also involve modeling of the experimental spectra.

拟议项目的目的是对固体状态下有机半导体中电子和核自旋松弛的机制有一个基本的了解，并开发出表征这些材料中电子和核自旋之间耦合的方法。电子自旋驰豫的机制目前还不是很清楚，特别是超精细和自旋-轨道相互作用引起的驰豫机制的相对重要性，以及相关动态过程的性质，这些动态过程产生可以引起自旋翻转的时变磁场。像Overhauser效应或DNP这样的现象在这些材料中仍然很大程度上没有被探索过。在该项目中，您将开发一种DNP方法来表征有机半导体及其在薄膜样品中的构象和局部微结构，并基于控制电子-核自旋相互作用来探索这些材料中的新物理现象，这些相互作用可能在能量存储、自旋电子学或量子信息处理等应用中被利用。该项目主要是一个实验项目，其基础是Cavenish实验室和化学部提供的电子自旋共振(ESR)和核磁共振(核磁共振)光谱测量以及动态核极化测量；该项目还将涉及对实验光谱进行建模。