Imaging Electron Energy-Loss Spectrometer

新的成像电子能量损失光谱仪(EEL光谱仪)将提供一系列新的先进的光谱和成像透射电子显微镜技术，用于精确到纳米和原子尺度的材料表征。我们将应用电子能量损失谱(EELS)和能量过滤电子显微镜(EFTEM)来定量测定特别是轻元素的分布，用于化学键/氧化态分析以及等离子体激元激发的研究。此外，能量过滤会聚束电子衍射(CBED)将使我们能够以前所未有的精度定量确定局部晶格参数，以进行详细的应变和温度测量。滤光式常规的透射电子显微镜成像(如亮场透射电子显微镜)将被用于厚样品的原位透射电子显微镜。与我们的现代透射电子显微镜相结合，带有两个专用的透射电子显微镜传输支架的新型成像鳗鱼光谱仪将提高锡根大学共享的显微和纳米分析设施(MNaF)的纳米表征能力，并将确保该大学在材料科学方面的长期国际竞争力。材料研究的范围从能量转换/存储和催化到传感器和光学应用到生命科学(特别是生物传感器)到结构应用(车辆，新成立的微纳分析集团在MNaF运营着一个现代化的EM实验室。该集团在样品制备、显微镜和光谱仪操作和维护方面的专业知识和实践经验，以及最重要的是广泛的电磁理论背景，将确保新光谱仪成功应用于计划中的研究。它计划在电池材料、半导体和基于低温的生命科学样品等环境敏感材料的光谱研究方面建立专业知识，以及使用专用的透射电子显微镜样品架进行惰性气体转移。

The new imaging electron energy-loss spectrometer (EEL spectrometer) is going to provide a wide range of new advanced spectroscopic and imaging TEM techniques for materials characterization down to the nanometer and atomic scale. We will apply electron energy-loss spectroscopy (EELS) and energy-filtered TEM (EFTEM) for the quantitative determination of the distributions of particularly light elements, for chemical bond/oxidation state analyses as well as for the study of plasmon excitations. Moreover, energy-filtered convergent-beam electron diffraction (CBED) will allow us to quantitatively determine the local lattice parameter with unprecedented accuracy for detailed strain and temperature measurements. Filtered conventional TEM imaging (e.g. bright-field TEM) will be utilized, e.g. for in situ TEM of thick samples.Together with our modern transmission electron microscope, the new imaging EEL spectrometer with two dedicated TEM transfer holders will boost the nanocharacterization capabilities at the shared Micro- and Nanoanalytics Facility (MNaF) of the University of Siegen and will assure the university’s international competitiveness in materials science in the long term.The materials research, which is planned to be addressed at the School of Science and Technology, ranges from energy conversion/storage and catalysis to sensor and optical applications to life science (in particular biosensors) to structural applications (vehicles, power plants, construction) with a wide range of materials classes under investigation: 2D semiconductors, nanoparticles, battery materials, bio/polymer materials, ceramics, alloys, and devices.The new Micro- and Nanoanalytics Group operates a modern EM laboratory at the MNaF. The group’s expertise and hands-on experience in sample preparation, microscope and spectrometer operation and maintenance and, most importantly, a broad theoretical EM background will assure the successful application of the new spectrometer to conduct the planned research. It is planned to establish expertise in the spectroscopic investigation of environment-sensitive materials like battery materials, semiconductors and life-science samples based on cryo as well as inertgas transfer with dedicated TEM sample holders.