Phase retrieval and spectroscopy of atoms and molecules in/on graphene by advanced electron microscopy

通过先进电子显微镜对石墨烯中/上的原子和分子进行相检索和光谱分析

• 批准号: 451037016
• 负责人: Professor Dr. Christoph Tobias Koch, Ph.D., since 11/2023
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/451037016?language=en
• 关键词: Phase; retrieval; spectroscopy; atoms; molecules

The aim of this project is to image and quantify the local atomic and electronic structure and electrostatic fields of functionalized graphene using advanced transmission electron microscopy techniques. This means, determining the position and species of every atom, and mapping the electrostatic potential in the vicinity of the carbon atoms and the functional species in/on graphene, thus enabling a quantitative understanding of the structure and property of each functionalization site separately, and how each of them contributes to the overall properties of the material. Specifically, graphene doped with interstitial atoms and with surface functional species is to be characterised using electron holographic techniques, complemented by analytical electron microscopy techniques. Our proposed research will deliver a more detailed understanding about the change of the properties of graphene and its structural comprehension by its functionalization. Additionally, our experimental strategy will lead to an integrated characterization methodology in the field of electron microscopy primarily but not exclusively for two-dimensional and radiation sensitive materials.

该项目的目的是利用先进的透射电子显微镜技术对功能化石墨烯的局部原子、电子结构和静电场进行成像和量化。这意味着，确定每个原子的位置和物种，并绘制碳原子附近的静电势和石墨烯中/上的功能物种，从而能够定量地了解每个官能化位置的结构和性质，以及它们如何对材料的整体性能做出贡献。具体地说，掺杂了间隙原子和表面功能物种的石墨烯将使用电子全息技术进行表征，并辅之以分析电子显微镜技术。我们提出的研究将对石墨烯的性质变化以及其功能化对其结构的理解提供更详细的理解。此外，我们的实验战略将导致电子显微镜领域的综合表征方法，主要但不限于二维和辐射敏感材料。