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)

• 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

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.

在化学测量和成像项目的支持下，德克萨斯理工大学的Gerardo Gamez正在研究和开发辉光放电光学发射编码孔径光谱成像元素映射（GOCAEM），这是一种分析和测量表面化学元素的新方法。各种领域，包括材料、地质和生物科学，使用元素映射来提高对自然发生系统的理解或提高制造系统的性能。然而，当前的元素映射技术受到冗长的样本分析时间或可访问性限制的影响，这限制了它们在一小组系统中的使用。GOCAEM利用辉光放电光谱的能力来克服这些限制（比典型的EM技术快1000倍），并结合压缩传感光谱成像策略，大大提高了能力，提供了分析具有挑战性的系统（如纳米级材料）的优势。因此，快速，常规诊断三维元素映射的许多纳米结构表面系统是一个真正的可能性与这种方法。该项目的成果将对许多领域产生影响，特别是那些依赖超薄薄膜和纳米颗粒材料的领域，这与国家纳米技术计划的需求和愿景是一致的。该项目将在指定的西班牙裔服务机构进行，这为接触科学、技术、工程和数学（STEM）领域代表性不足的少数族裔提供了难得的机会。研究生和本科生的多学科培训机会包括仪器开发、等离子体光谱、成像、纳米材料表征和表面分析。该项目的目标是通过辉光放电光学发射光谱（GDOES）实现纳米材料的元素映射（EM）。GDOES最初是作为一种替代元素映射技术开发的，与典型技术相比，它在分析时间上提供了显著（几个数量级）的改进。GDOES还通过溅射采样及其高通量二维元素映射提供了显着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，要达到GDOES提供的最高深度分辨率（~nm）和检测极限，还必须取得显著的进展。我们将开发辉光放电光学发射编码孔径光谱成像元素映射（GOECAEM），其中通过压缩感知（CS）策略启用的高光谱成像将实现所需的深度分辨率和检测限制增益。CS是最近开发的一种测量策略，代表了抽样的范式转变。它允许在数据采集步骤中使用压缩协议（通常为软件数据处理保留）：这大大提高了数据收集效率和所需的测量时间。利用空间光调制器和阵列探测器开发和实现编码孔径压缩传感高光谱成像。因此，随着两种不同类型材料的方法的发展，将寻求纳米结构材料的高通量三维元素映射。本研究的三个主要目标是：1)GOECAEM仪器的设计和构建；2)开发纳米级超薄膜材料表征的三维GOECAEM方法；3)开发goecaem纳米颗粒表征方法。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

High-throughput single pixel spectral imaging system for glow discharge optical emission spectrometry elemental mapping enabled by compressed sensing

高通量单像素光谱成像系统，用于通过压缩传感实现辉光放电发射光谱测定元素映射

• DOI: 10.1039/d2ja00021k
• 发表时间: 2022
• 期刊: Journal of Analytical Atomic Spectrometry
• 影响因子: 3.4
• 作者: Gamez, Gerardo;She, Yue;Rivera, Paola;Shi, Songyue;Finch, Kevin
• 通讯作者: Finch, Kevin