Research Initiation Award: The Redox State, Composition, andStructure of Reactive Oxide Surfaces: W/M/D Supplement

这是一个尝试，以开发一种方法，用于确定 金属氧化物催化剂表面层的氧化态 在催化反应过程中。 到目前为止，这样的数据已经 除非在非常不现实的条件下，否则无法获得。 的 方法结合瞬态动力学在大气或近， 大气压力与光谱（特别是俄歇 电子光谱法）。 两种类型的 氧化物进行了研究：厚（微米级）膜的一个和 多晶金上的双组分氧化物， 尖晶石（纳米尺寸）薄膜外延生长在单一的 黄金晶体 拉曼光谱与低能电子 衍射用于表征膜。 乙醇 用作化学探针;酸碱和氧化还原反应 被跟踪。 金属氧化物是技术上重要的材料， 它们的强度，稳定性，以及各种光学，电学， 和磁性。 在氧化物的制造中， 以及在它们的许多应用中， 重要. 本项目所研究的材料具有典型性 在工业中使用的许多多组分体系中， 应用. 这项关于 原子结构、组成、氧化态和表面 因此化学反应性具有广泛的适用性， 特别是在材料设计中， 分子结构

This is an attempt to develop a method for determining the oxidation state of surface layers of metal-oxide catalysts during a catalytic reaction. Up to now, such data have been unobtainable except under very unrealistic conditions. The method combines transient kinetics at atmospheric or near- atmospheric pressures with spectroscopy (especially Auger electron spectroscopy) under ultrahigh vacuum. Two types of oxides are studied: thick (micron-sized) films of one-and two-componement oxides on polycrystalline gold, and thin (nanometer-sized) films of spinels grown epitaxially on single crystals of gold. Raman spectroscopy and low-energy electron diffraction are used to characterize the films. Ethanol is used as a chemical probe; both acid-base and redox reactions are followed. Metal oxides are technologically important materials because of their strength, stability, and varied optical, electric, and magnetic properties. In the fabrication of oxides, as well as in many of their applications, surface properties are important. The materials studied in this project are typical of many multicomponent systems used in industrial applications. This investigation of the relationships between atomic structure, composition, oxidation state, and surface chemical reactivity therefore has wide applicability, especially for materials design using the principles of molecular architecture.