Glow Discharge Optical Emission Coded Aperture Spectral Imaging Elemental Mapping (GOCAEM) for Ultrahigh Throughput 3D Surface Analysis of Nanoscale Materials

用于纳米级材料超高通量 3D 表面分析的辉光放电光学发射编码孔径光谱成像元素测绘 (GOCAEM)

基本信息

批准号：
2108359
负责人：
Gerardo Gamez
金额：
$ 41.1万
依托单位：
Texas Tech University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-06-01 至 2025-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108359&HistoricalAwards=false
关键词：
Glow Discharge Optical Emission Coded

项目摘要

With support from the Chemical Measurement and Imaging Program in the Division of Chemistry, Gerardo Gamez at Texas Tech University is studying and developing Glow Discharge Optical Emission Coded Aperture Spectral Imaging Elemental Mapping (GOCAEM), which is a novel method for analyzing and measuring chemical elements on surfaces. A variety of fields, including materials, geological, and biological sciences, use elemental mapping to gain an improved understanding of naturally occurring systems or improve performance of manufactured systems. However, current elemental mapping techniques suffer from lengthy sample analysis times or accessibility restrictions, which limits their use to a small group of systems. GOCAEM leverages the ability of glow-discharge spectroscopy to overcome such limitations (1000x faster vs typical EM techniques) and incorporates compressed sensing spectral imaging strategies to offer greatly improved abilities, offering advantages that allow analysis of challenging systems, such as nanoscale materials. Thus, fast, routine diagnostic three-dimensional elemental mapping of many nano-structured surface systems is a real possibility with this approach. Outcomes from the project will have an impact on many fields, especially those relying on ultra-thin films and nanoparticle materials, which is in alignment with serving the needs and vision of the National Nanotechnology Initiative. The project will take place at a designated Hispanic Serving Institution, which provides an uncommon opportunity to reach underrepresented minorities in science, technology, engineering, and mathematics (STEM). Multidisciplinary training opportunities for graduate and undergraduate researchers include those with instrument development, plasma spectroscopy, imaging, nanomaterials characterization, and surface analysis. The goal of this project is to enable elemental mapping (EM) of nanomaterials via glow discharge optical emission spectroscopy (GDOES). GDOES has been initially developed as an alternative elemental mapping technique that offers significant (several orders of magnitude) improvement in analysis time compared to typical techniques. GDOES also gives access to significantly faster three-dimensional elemental mapping protocols through sputter sampling and its high-throughput two-dimensional elemental mapping. Nevertheless, the depth resolution is still limited by the two-dimensional elemental mapping time; thus, significant gains must still be achieved to reach the highest depth resolution (~nm) and limits of detection offered by GDOES. We will develop Glow Discharge Optical Emission Coded Aperture Spectral Imaging Elemental Mapping (GOECAEM), where hyperspectral imaging enabled by compressed sensing (CS) strategies will achieve the required gains in depth resolution and limits of detection. CS is a recently developed measurement strategy that represents a paradigm shift in sampling. It allows employment of compression protocols (typically reserved for software data processing) during the data acquisition step: this results in significantly improved data collection efficiency and measurement time required. Coded aperture compressed sensing hyperspectral imaging will be developed and implemented using spatial light modulators and array detectors. As such, high throughput three-dimensional elemental mapping of nano-structured materials will be sought here with the development of methods for two different types of materials. The three main objectives of the proposed research are 1) design and construction of GOECAEM instrumentation; 2) development of 3-dimensional GOECAEM enabled methods for ultra-thin film materials characterization at the nanoscale; and 3) development of GOECAEM-enabled methods for nanoparticle characterization.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学分区的化学测量和成像计划的支持下，德克萨斯理工大学的Gerardo Gamez正在研究和开发Glow排放光发射光光谱谱谱元素映射（GOCAEM），这是一种用于分析和测量表面上化学元件的新方法。包括材料，地质和生物科学在内的各种领域，都使用元素映射来提高对自然发生的系统的了解或改善制造系统的性能。但是，当前的元素映射技术遭受了冗长的样本分析时间或可访问性限制，这将其使用限制为一小组系统。 GoCaem利用了发光分离光谱法克服此类限制（更快的1000倍与典型的EM技术）的能力，并结合了压缩的传感光谱成像策略以极大地提高了能力，从而提供了允许对纳米级材料等挑战系统进行分析的优势。因此，通过这种方法，许多纳米结构表面系统的快速，常规诊断三维元素映射是一种真正的可能性。该项目的结果将对许多领域产生影响，尤其是那些依靠超薄电影和纳米颗粒材料的领域，这些材料与国家纳米技术计划的需求和愿景保持一致。该项目将在指定的西班牙裔服务机构举行，该机构提供了一个罕见的机会来吸引科学，技术，工程和数学（STEM）的代表性不足的少数群体。研究生和本科研究人员的多学科培训机会包括具有仪器开发，血浆光谱，成像，纳米材料表征和表面分析的培训机会。该项目的目的是通过发光放电光发射光谱（GDOES）实现纳米材料的元素映射（EM）。与典型技术相比，GDOES最初是作为一种替代元素映射技术开发，该技术可在分析时间上有显着改善（几个数量级）。 GDOES还通过溅射采样及其高通量二维元素映射，可访问更快的三维元素映射协议。然而，深度分辨率仍然受到二维元素映射时间的限制。因此，仍必须取得显着的收益，以达到GDOES提供的最高深度分辨率（〜nm）和检测限制。我们将开发发光放电的光发射光谱频谱成像元素映射（GOECAEM），其中通过压缩感应（CS）策略启用了高光谱成像，将在深度分辨率和检测限制中实现所需的收益。 CS是最近开发的测量策略，代表采样中的范式转移。它允许在数据采集步骤中使用压缩协议（通常用于软件数据处理）：这会大大提高数据收集效率和所需的测量时间。使用空间光调节器和阵列探测器，将开发和实现编码的孔径压缩高光谱成像。因此，通过开发两种不同类型的材料的方法，将寻求纳米结构材料的高吞吐量三维元素映射。拟议研究的三个主要目标是1）Goecaem仪器的设计和构建； 2）开发在纳米级的超薄薄膜材料表征的三维GOECAEM的方法； 3）开发了纳米颗粒表征的GOECAEM启用方法。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响标准，被认为值得通过评估来获得支持。