MRI: Acquisition of an extreme-resolution low-voltage scanning electron microscope

MRI：购买高分辨率低压扫描电子显微镜

• 批准号: 1337694
• 负责人: Jon-Paul Maria
• 金额: $ 74万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1337694&HistoricalAwards=false
• 关键词: MRI; Acquisition; extreme; resolution; low

1337694Maria This Major Research Instrumentation award supports North Carolina State University (NCSU) with the acquisition of a high-resolution scanning electron microscope that can produce electron beams with landing energies lower than 0.1 keV while retaining lateral resolution below 1 nm. The proposed instrument enables imaging with beam currents below 5 pA. This combination of low landing energy and low current brings three transformational capabilities to NCSU: 1) it is possible to eliminate surface charging by balancing energy dependent electron arrival and emission rates; 2) it is possible to acquire information that is highly surface specific; and 3) it is possible to minimize beam damage in materials that would otherwise deteriorate rapidly. In combination, these capabilities will propel existing research by providing structural information at dramatically higher resolution and on samples that simply could not be imaged previously. These capabilities will enhance materials research at NCSU that is increasingly interdisciplinary, with focused efforts on electronic heterostructures, nanofiber/nanoparticle composites, colloidal assemblies, and DNA-mediated organic-inorganic assemblies. ***** This Major Research Instrumentation award supports North Carolina State University (NCSU) with the acquisition of an extreme-resolution scanning electron microscope that images with low energy electrons. The key benefit of this instrument is imaging with a resolving power approaching atomic dimensions without the limitations due to the accumulation of negative charges on the sample surface that severely limits image quality and resolution. Furthermore, this low energy probe allows researchers to explore organic substances like plastics, natural fibers, and in some cases cells, which would decompose rapidly if imaged in a conventional instrument. This instrument will strengthen existing interdisciplinary programs at NCSU and is the greater Research Triangle region through its ability to characterize a diverse palette of materials at extreme resolution. In addition the instrument will create new outreach opportunities to inspire future generations of students in science, technology and math disciplines.

1337694MARIA这项主要的研究仪器奖支持北卡罗来纳州立大学（NCSU）获得了高分辨率扫描电子显微镜的收购，该扫描电子显微镜可以生产出低于0.1 KEV的电子束，同时保持低于1 nm的横向分辨率。该提出的仪器可实现5 pa以下的光束电流的成像。低着陆能和低电流的组合为NCSU带来了三种变换能力：1）可以通过平衡依赖能量的电子到达和排放速率来消除表面充电； 2）可以获取高度表面特定的信息； 3）有可能最大程度地减少材料的光束损伤，否则可能会迅速恶化。结合起来，这些功能将通过在较高的分辨率上提供结构信息以及以前无法对的样品提供的样品来推动现有的研究。这些功能将增强NCSU的材料研究，该研究越来越跨学科，并着重于电子异质结构，纳米纤维/纳米颗粒复合材料，胶体组件和DNA介导的有机易生物组件。 *****这项主要的研究仪器奖通过获取具有低能电子图像的极端分辨率扫描电子显微镜，支持北卡罗来纳州立大学（NCSU）。该仪器的关键优势是成像，由于在样品表面上积累负电荷的积累而导致的限制，这会严重限制图像质量和分辨率。此外，这种低能量探测器使研究人员可以探索塑料，天然纤维等有机物质，在某些情况下，如果在常规仪器中成像，它们会迅速分解。该仪器将加强NCSU的现有跨学科计划，并通过其以极端分辨率来表征各种材料调色板的能力是更大的研究区域。此外，该乐器将创造新的外展机会，以激发科学，技术和数学学科中的学生的子孙后代。