MRI: Acquisition of a High-Resolution Analytical Transmission Electron Microscope

技术摘要：21世纪的科学技术将在很大程度上依赖于新材料的开发，这些新材料的性能可以根据性能要求进行定制。智能材料的发展无疑将在信息科学、微电子、计算机科学、医学分析、生命科学、能源、交通、安全工程和军事技术等诸多科学技术领域引发一场革命。纳米技术和材料科学的一个关键基础设施是一流的成像和分析设备，它能够提供亚埃分辨率成像和原子柱定位化学信息。本方案的目标是获得最先进的300 keV场发射透射/扫描电子显微镜（TEM/STEM），具有0.19 nm点对点图像分辨率和0.2 nm直径的高亮度纳米探针，高稳定性的样品台（1 Å漂移/min-1），高收集效率的固态x射线探测器(s)，光束扫描能力（用于x射线映射）和亚ev能量分辨率的电子能量损失光谱仪。TEM/STEM旨在满足佐治亚理工学院每年500多名纳米技术和材料科学研究团体的需求。先进的TEM最强大的应用是它的超高分辨率，可以成像材料的原子结构，分辨率为~0.1-0.2 nm。结合电子衍射，TEM在确定材料的缺陷、界面和畴结构方面具有独特的优势。为了补充这种强大的成像能力，x射线能量色散光谱（EDS）和电子能量损失光谱（EELS）是迄今为止在TEM中测量样品成分的最快速和方便的方法，其空间分辨率约为电子探针的大小。利用高相干、高亮度的电子探针，可以实现~0.2 nm的空间分辨率。能谱仪代表了量化像氮一样轻的元素组成的最强大的技术。外行人总结：智能材料的发展继续是信息科学、微电子、计算机科学、医学分析、生命科学、能源、交通、安全工程和军事技术等诸多科技领域的一场革命。因此，未来材料的发展方向应该是创造在某些方面甚至可能超越生物器官的超功能材料。一个关键的挑战是将材料的结构与其性能联系起来，以便完全控制结构和成分的演变，以实现卓越的性能。电子显微镜和相关的分析技术已被证明是探索与各种材料和器件相关的纳米世界的最强大的技术之一。拟议的HRTEM将代表佐治亚理工学院所有纳米和生物研究项目的战略设备。这将影响分布在全校10个单元的众多项目，包括但不限于：先进催化、光伏材料、储能和发电、生物传感、生物成像、药物输送、复合材料、电子封装和互连。拟议的TEM每年将产生500多篇研究论文。它还将影响亚特兰大地区的当地工业。它将为本科生、研究生和博士后的教育和培训做出巨大贡献。

0922776WangGA Tech Research Corporation - GITTechnical Summary: Science and technology in the 21st century will rely heavily on the development of new materials with properties that can be tailored according to performance requirements. The development of smart materials will undoubtedly contribute to a revolution in many fields of science and technology such as information science, microelectronics, computer science, medical analysis, life sciences, energy, transportation, safety engineering and military technologies. A key piece of infrastructure for nanotechnology and materials science is a first class imaging and analysis facility, which is capable of providing sub-Angstrom resolution imaging and atom-column localized chemical information. The objective of this proposal is to acquire a state-of-the-art 300 keV field emission transmission/scanning electron microscope (TEM/STEM) with a 0.19 nm point-to-point image resolution and 0.2 nm diameter high-brightness nanoprobe, a high stability specimen stage (1 Å drift/min-1), a high collection efficiency solid state x-ray detector(s), beam scanning capabilities (for x-ray mapping), and a sub-eV energy resolution electron energy-loss spectrometer. The TEM/STEM is designed to meet the needs of a large research community of more than 500 per year in nanotechnology and materials science at the Georgia Institute of Technology. The most powerful application of an advanced TEM is its super-high resolution for imaging the atomic structure of materials at a resolution of ~0.1-0.2 nm. Combined with electron diffraction, TEM is unique in determining the defect, interface and domain structures of materials. Complimenting this powerful imaging capability, X-ray energy-dispersive spectrometry (EDS) and electron energy-loss spectroscopy (EELS) by far the most rapid and convenient method for measuring the composition of a specimen in the TEM at a spatial resolution approximately the size of the electron probe. By using a high-coherence, high-brightness electron probe, a spatial resolution of ~0.2 nm can be achieved for thin samples. EDS represents the most powerful technique for quantifying the composition of elements as light as nitrogen. Layman Summary: The development of smart materials continues to be a revolution in many fields of science and technology such as information science, microelectronics, computer science, medical analysis, life sciences, energy, transportation, safety engineering and military technologies. Materials development in the future, therefore, should be directed toward creation of hyperfunctional materials which may surpass even biological organs in some aspects. A key challenge is to correlate the material's structure with its properties in order to fully control structural and compositional evolution for achieving superior performance. Electron microscopy and associated analysis techniques have proven to be one of the most powerful techniques for exploring the nanoscopic world associated with a variety of materials and devices. The proposed HRTEM will represent strategic equipment for all of the nano- and bio-research programs at Georgia Tech. This will impact numerous programs distributed over 10 units, campus-wide, including but not limited to: advanced catalysis, photovoltaic materials, energy storage and generation, biosensing, bioimaging, drug delivery, composite materials, electronic packaging and interconnects. The proposed TEM will produce over 500 research articles per year. It will also impact local industry in the Atlanta area. It will make huge contribution to the education and training of undergraduate students, graduate students and postdoctoral fellows.