MRI: Acquisition of a 3D Tomographic Atom-Probe Microscope

MRI：获取 3D 断层扫描原子探针显微镜

• 批准号: 1040243
• 负责人: David Bell
• 金额: $ 86.5万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1040243&HistoricalAwards=false
• 关键词: MRI; Acquisition; 3D; Tomographic; Atom

Technical Summary: An Atom Probe Tomography (APT) Microscope is a new material analysis instrument that provides the only technique that can obtain both three-dimensional (3D) tomographic images and chemical identification at the atomic scale. It provides insight into key problems in the materials science, chemistry, physics and engineering of nanoscale structures and devices. The APT Microscope uses a rapidly pulsed electric field from a local electrode to remove atoms individually from the sample; the atom mass is determined by the time of flight to an imaging detector array. These 3D tomographic images can identify the element, and even the isotope, of individual atoms. They enable the spatial mapping of structural defects, dopants, and atomic structure and composition in nanowires, patterned materials, heterostructures and devices. The ability to completely visualize a material directly is new, and it opens a new range of investigations and applications. This proposal asks for funds to acquire a 3D APT Microscope for installation in the Center for Nanoscale Systems at Harvard University. The APT Microscope will promote collaborations between physicists, chemists, and device developers with materials scientists by allowing them to examine spatially modulated structures at the atomic scale. This information is particularly important for nanoscale devices for electronics and photonics, where atomic scale interfaces determine the behavior of the device. This instrument can be used to understand the structure of materials at the atomic level, including complex oxide semiconductors that are promising for future electronics, solar cells and fuel cells. The installation of a Atom-Probe Tomography Microscope in the Center for Nanoscale Systems at Harvard University will provide direct and open access for researchers and educators in the Northeast region of the United States. It will provide opportunities for to a diverse population of students. An innovative educational program "Nanoscale Imaging and Analysis" will use the APT Microscope to integrate research into the teaching of materials science, physics and chemistry at the undergraduate, graduate and adult levels.Layman Summary: To make and understand atomic-scale structures, we must be able to both image the location of individual atoms in a structure and identify their chemical identity. Atom Probe Microscopy is the only technique that provides this information. A three-dimensional image displays the atoms, and different colors can be used to show which element they are. By creating images that are easy to understand, an Atom Probe Microscope will allow us to make and understand truly small atomic scale devices for computation, communication, energy production, and medical treatment. The instrument operates by using a rapidly pulsed electric field to remove an individual atom from the sample - the time of flight to the imaging detector determines the mass of each atom. The images can identify the element, and even the isotope, of each atom, as well as its location. The Atom-Probe Microscope will be installed in the Center for Nanoscale Systems at Harvard University, and provide direct and open access for researchers and educators in the Northeast region of the United States - it will enhance the education of a diverse population of students. This new instrument will allow researchers to understand the atomic structure of new electronic and optical devices, create new types of solar cells and fuel cells to ease the national energy problem, and fundamentally study the structure of materials at the atomic level.

技术概述：原子探测层析(APT)显微镜是一种新的材料分析仪器，它提供了唯一一种可以获得原子尺度上的三维(3D)层析图像和化学识别的技术。它提供了对纳米结构和设备的材料科学、化学、物理和工程中的关键问题的见解。APT显微镜使用来自局部电极的快速脉冲电场从样品中单独移除原子；原子质量由飞行到成像探测器阵列的时间确定。这些3D断层图像可以识别单个原子的元素，甚至是同位素。它们使得纳米线、图案化材料、异质结构和器件中的结构缺陷、掺杂以及原子结构和组成的空间映射成为可能。直接将材料完全可视化的能力是新的，它开启了一系列新的研究和应用。这项提案要求获得资金，以获得安装在哈佛大学纳米系统中心的3D APT显微镜。APT显微镜将促进物理学家、化学家和设备开发商与材料科学家之间的合作，使他们能够在原子尺度上检查空间调制结构。这一信息对于电子学和光子学的纳米级设备尤其重要，在这些设备中，原子尺度的界面决定了设备的行为。该仪器可用于在原子水平上了解材料的结构，包括有望用于未来电子产品、太阳能电池和燃料电池的复合氧化物半导体。在哈佛大学纳米系统中心安装原子探针断层扫描显微镜，将为美国东北地区的研究人员和教育工作者提供直接和开放的途径。它将为不同群体的学生提供机会。一个创新的教育项目“纳米级成像和分析”将使用APT显微镜将研究整合到本科生、研究生和成人层面的材料科学、物理和化学教学中。莱曼摘要：要制作和理解原子级结构，我们必须能够成像单个原子在结构中的位置并识别它们的化学身份。原子探针显微镜是提供这一信息的唯一技术。三维图像显示原子，可以使用不同的颜色来显示它们是哪种元素。通过创建易于理解的图像，原子探针显微镜将允许我们制造和理解用于计算、通信、能源生产和医疗的真正小型原子设备。该仪器通过使用快速脉冲电场从样品中移除单个原子--飞行到成像探测器的时间决定了每个原子的质量。这些图像可以识别每个原子的元素，甚至是同位素，以及它的位置。原子探针显微镜将安装在哈佛大学纳米系统中心，为美国东北部地区的研究人员和教育工作者提供直接和开放的访问-它将加强对不同学生群体的教育。这一新仪器将使研究人员能够了解新型电子和光学设备的原子结构，创造新型太阳能电池和燃料电池来缓解国家能源问题，并从根本上从原子水平上研究材料的结构。