Parallel Plasmonics and Raman In-Situ Study of Au Nanoparticle: Metal Oxide Interfacial Catalytic Reactions

非技术描述：在过去的十年中，人们已经了解了金属/金属氧化物纳米复合材料的纳米级性能，但关于环境条件和纳米级性能之间的相互关系以及它们对纳米复合材料的催化和/或传感性能的影响，还有很多有待发现。具体来说，金纳米颗粒或其团簇的独特催化性能受到其大小、形状（片状、棒状等）和金属氧化物主体材料的强烈影响。虽然负载纳米颗粒被证明是不稳定的，并且通常在高温下形成球体，但嵌入纳米颗粒已被证明在高温下保持其独特的形状。因此，它们显示出在高温下实现独特催化反应的巨大希望。在这个项目中，他们将系统地研究金属/金属氧化物纳米复合材料界面上的催化反应，以确定金属纳米颗粒以及陶瓷的大小和形状如何？S化学会影响反应。该项目将通过外展计划为研究生、本科生和高中生提供教育机会，从而实现以研究和教育为重点的成果。技术细节：他们将开发一种全光学局部表面等离子体共振/微表面增强拉曼光谱（LSPR/uSERS）分析方法，用于研究具有精确晶粒尺寸和形状控制的金纳米颗粒(AuNP)-金属氧化物纳米复合膜。金纳米颗粒或其团簇的独特催化性能受到其大小、形状（片状、棒状等）和金属氧化物主体材料的强烈影响。然而，负载颗粒在高温下是热不稳定的，并且倾向于生长和或变成球形，因此它们独特的催化性能不适用于广泛的热环境。嵌入颗粒已被证明更稳定，将使用电子束光刻和气溶胶辅助化学气相沉积沉积，这些将用于研究它们的热稳定性以及它们独特的光学和催化活性。由于催化反应通常涉及许多电荷转移事件，等离子体研究将用于确定催化活性纳米颗粒上的总电荷，同时用于探测表面化学和金属氧化物宿主。该项目将促进新型催化活性材料、新型等离子体传感阵列范例的开发和研究，并为研究生、本科生和高中生提供教育推广计划。

NON-TECHNICAL DESCRIPTION: Within the past decade, much has been learned about the nanoscale properties of metal/metal oxide nanocomposite materials, but much is still left to be discovered regarding the interrelationship between environmental conditions and nanoscale properties and their resulting effects on the nanocomposite's catalytic and/or sensing properties. Specifically, the unique catalytic properties of Au nanoparticles or their clusters are strongly affected by their size, shape (platelets, rods, etc.) and the metal oxide host material. While supported nanoparticles have been shown to be unstable and generally form spheres at elevated temperatures, embedded nanoparticles have been shown to retain their unique shapes at elevated temperatures. Thus they show great promise for enabling unique catalytic reactions at elevated temperatures. In this project, they will systematically study catalytic reactions at the interface of the metal/metal oxide nanocomposite to determine how the size and shape of the metal nanoparticle as well as the ceramic?s chemistry affect the reaction. The project will provide educational opportunities for graduate, undergraduate and high school students through an outreach program which will enable both research and education focused outcomes. TECHNICAL DETAILS: They will develop an all-optical localized surface plasmon resonance/micro surface enhanced Raman spectroscopy (LSPR/uSERS) analytical method for the study of gold nanoparticle (AuNP)- metal oxide nanocomposite films with precise grain size and shape control. The unique catalytic properties of Au nanoparticles or their clusters are strongly affected by their size, shape (platelets, rods, etc.) and metal oxide host material. However, supported particles are thermally unstable at elevated temperatures and tend to grow and or become spherical and thus their unique catalytic properties are not amenable for a broad range of thermal environments. Embedded particles have been shown to be more stable and will be deposited using electron beam lithography and aerosol-assisted chemical vapor deposition and these will be studied for their thermal stability as well as for their unique optical and catalytic activity. As catalytic reactions typically involve a number of charge transfer events, plasmonic studies will be used to determine the total charge on the catalytically active nanoparticle in parallel with uSERS for probing both the surface chemistry as well as the metal oxide host. This project will enable the development and study of novel catalytically active materials, new plasmonic sensing array paradigms as well as an educational outreach program for graduate, undergraduate and high school students.