Tip-enhanced Raman scattering unraveling molecular interactions in individual carbon nanotube systems

尖端增强拉曼散射揭示了单个碳纳米管系统中的分子相互作用

• 批准号: 283336994
• 负责人: Professorin Dr. Janina Maultzsch
• 金额: --
• 依托单位: Fach Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/283336994?language=en
• 关键词: Tip; enhanced; Raman; scattering; unraveling

Devices on the nanometer scale drive intensive research today and will gain even more influence in the future for both the field of nanoelectronics and the field of biochemistry and medicine. Tip-enhanced Raman scattering (TERS) is an ideal method to understand the functionality of such devices in depth, since it combines microscopic with spectroscopic information at nanometer scale spatial resolution. This project is going to unfold the full potential of TERS to characterize and study the structure of nanoscale devices. The model systems most suitable for this investigation are functionalized carbon nanotubes (CNTs). On the one hand, they show a high potential for applications as nanosensors or single molecule detectors. On the other hand, Raman spectroscopy on CNTs is well understood, and TERS on CNTs has been demonstrated. However, knowledge about interactions between CNTs and other molecules grafted to them is still limited. We will study such interactions in particular with magnetic molecules, correlating high-resolution transmission electron microscopy with Raman spectroscopy and TERS on the same CNT and using the full spectral information. Energy filtered electron energy loss spectroscopy provides element selectivity and will be used to determine the spatial resolution as well as the chemical selectivity of TERS. The resonance effect in Raman spectroscopy gives insight into the electronic states of the material. Thus, studying the influence of the resonance effect on the TERS spectra of functionalized CNTs will lead to an understanding of the influence of the functionalization on the electronic properties of the CNT, e.g., by doping or creation of defects. The final goal of the project is then to combine the results to select those sites on functionalized CNTs with the most promising and the most interesting properties for transport devices.

纳米级器件推动了当今的深入研究，并将在未来对纳米电子学领域以及生物化学和医学领域产生更大的影响。尖端增强拉曼散射（TERS）是深入了解此类器件功能的理想方法，因为它在纳米级空间分辨率下结合了显微镜和光谱信息。该项目将充分发挥TERS的潜力，以表征和研究纳米器件的结构。最适合这项调查的模型系统是功能化的碳纳米管（CNT）。一方面，它们显示出作为纳米传感器或单分子检测器的应用的高潜力。另一方面，碳纳米管上的拉曼光谱被很好地理解，并且碳纳米管上的TERS已经被证明。然而，有关碳纳米管和其他分子之间的相互作用的知识仍然是有限的。我们将研究这种相互作用，特别是与磁性分子，相关的高分辨率透射电子显微镜与拉曼光谱和TERS在同一个CNT和使用完整的光谱信息。能量过滤电子能量损失谱提供元素选择性，并将用于确定空间分辨率以及TERS的化学选择性。拉曼光谱中的共振效应使人们能够深入了解材料的电子状态。因此，研究共振效应对官能化CNT的TERS光谱的影响将导致理解官能化对CNT的电子性质的影响，例如，通过掺杂或产生缺陷。该项目的最终目标是联合收割机的结果，选择那些网站上的功能化碳纳米管与最有前途的和最有趣的传输设备的性能。