MRI: Acquisition of a near Ambient Pressure X-ray Photoelectron Spectroscopy Apparatus for Research and Education

MRI：采购用于研究和教育的近环境压力 X 射线光电子能谱设备

• 批准号: 2018319
• 负责人: William Kaden
• 金额: $ 54.25万
• 依托单位: The University of Central Florida Board of Trustees
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2018319&HistoricalAwards=false
• 关键词: MRI; Acquisition; near; Ambient; Pressure

This award is supported by the Major Research Instrumentation and the Chemistry Research Instrumentation programs. The University of Central Florida is acquiring an X-ray photoelectron spectrometer (XPS) with ambient temperature capabilities to support Professor William Kaden and colleagues Sudipta Seal, Laurene Tetard, Xiaofeng Feng and Fudong Liu. This spectrometer operates at near ambient pressure unlike a conventional XPS which studies samples in a high vacuum. This enables characterization of materials involving all three phases of matter (solid, liquid, gas) in pressures as high as several tenths of an atmosphere. This capability greatly expands the classes of materials which can be investigated. An example is a project to improve a catalyst surface employed in hydrogenation reactions used to convert a feedstock into a more valuable product. Basically, XPS spectra are produced by irradiating the specimen with X-rays with sufficient energy to eject electrons. The kinetic energy of the electrons is measured. This provides information on the binding energy of the electron. These data can be related to the chemical elements in the sample and effects from their bonding environment. Such experiments assist characterization of the surface of the materials under study and can lead to improvement in their properties. The instrument is employed in research projects undertaken by undergraduate and graduate students preparing them for the modern workplace. It is incorporated into several programs in place to train and recruit underrepresented students.The research enabled is directed at investigating gas-solid, liquid-solid, and gas-liquid interfaces under environmental conditions relevant for characterizations in situ (in the same place the phenomenon is occurring without isolating it from other systems or altering the original conditions of the test). The XPS is employed to dynamically identify surface interactions in heterogeneously catalyzed reactions as they occur commonly referred to as operando conditions. The instrumentation is used to characterize liquid-gas interfaces to help understand wet-chemical processes on resultant catalytic properties. In addition, it aids in the characterization of liquid-solid interfaces under varied conditions. The spectrometer is also utilized to investigate delicate biological samples which otherwise would be destroyed if the most common XPS technique that employs ultrahigh vacuum is used.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.

该奖项由主要研究仪器和化学研究仪器计划支持。中佛罗里达大学正在购买一台具有环境温度能力的X射线光电子能谱仪（XPS），以支持William Kaden教授及其同事Sudipta Seal、Laurene Tetard、Xiaofeng Feng和Fudong Liu。这种光谱仪在接近环境压力下工作，不像传统的XPS在高真空中研究样品。这使得能够在高达十分之几个大气压的压力下表征涉及所有三相物质（固体、液体、气体）的材料。这种能力大大扩展了可以研究的材料类别。一个例子是改善加氢反应中使用的催化剂表面的项目，用于将原料转化为更有价值的产品。基本上，XPS光谱是通过用具有足够能量以发射电子的X射线照射样品来产生的。测量电子的动能。这些数据可以与样品中的化学元素及其结合环境的影响相关联。这些实验有助于表征所研究材料的表面，并可改善其性能。该仪器用于本科生和研究生开展的研究项目，为他们进入现代工作场所做准备。它被纳入几个项目中，以培养和招募代表性不足的学生。该研究旨在研究与原位表征相关的环境条件下的气-固、液-固和气-液界面（在同一地点发生现象，而不将其与其他系统隔离或改变测试的原始条件）。XPS用于动态识别非均相催化反应中的表面相互作用，因为它们通常被称为操作条件。该仪器用于表征液-气界面，以帮助了解湿化学过程对所得催化性能的影响。此外，它还有助于在不同条件下表征液-固界面。光谱仪还用于研究脆弱的生物样品，否则如果使用最常见的XPS技术，采用超真空将被破坏。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。