Atomic Structure and Reactivity of Ferroelectric Surfaces: the Effect of Polarization at the Surface

铁电表面的原子结构和反应性：表面极化的影响

• 批准号: 0805174
• 负责人: Dawn Bonnell
• 金额: $ 30万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0805174&HistoricalAwards=false
• 关键词: Atomic; Structure; Reactivity; Ferroelectric; Surfaces

NON-TECHNICAL DESCRIPTION: The family of compounds that exhibit ferroelectric properties contains exciting materials that are enabling current and future generation wireless communications, information storage in consumer electronics, etc. This class of materials is inspiring exciting new strategies for catalysis, hybrid sensors, and as the basis of novel nanofabrication routes. Recent results have shown that the reactivity of these surfaces depends upon the orientation ferroelectric domains. Exploiting this and the future potential of ferroelectric materials requires that the atomic interactions at ferroelectric surfaces be understood. This project is using atomic-resolution probes to study molecular interactions at ferroelectric surfaces. In conjunction with this, a study of on gender equity in engineering is being undertaken.TECHNICAL DETAILS: This program uses advanced scanning probe microscopy in conjunction with surface scattering and spectroscopic tools to determine the origin of surface structures on non-metallic perovskite oxides, specifically ferroelectrics, and the effect of local polarization on surface behavior. The interplay of atomic polarization and surface structure/reactivity is becoming critical in electronic devices such as those enabling wireless communications as components become smaller. It has recently been shown that ferroelectric domains exhibit domain specific surface reactivity. This has led to new concepts for nanofabrication, catalysis, and electronic devices. In order to develop a fundamental understanding of domain specific behavior, the structures of BaTiO3 (100) surfaces will be determined and the effect of domain orientation on adsorption will be quantified. In addition to training students on advanced atomic imaging in the context of important technological materials, a study on gender equity in engineering is being carried out.

非技术描述：表现出铁电特性的化合物家族包含令人兴奋的材料，可以实现当前和未来一代的无线通信，消费电子产品中的信息存储等。这类材料激发了催化、混合传感器的新策略，并作为新型纳米制造路线的基础。最近的结果表明，这些表面的反应性取决于取向铁电畴。利用这一点和铁电材料的未来潜力需要理解铁电表面的原子相互作用。这个项目是使用原子分辨率探针来研究铁电表面的分子相互作用。与此同时，正在进行一项关于工程中的性别平等问题的研究。技术细节：该计划使用先进的扫描探针显微镜，结合表面散射和光谱工具来确定非金属钙钛矿氧化物表面结构的起源，特别是铁电体，以及局部极化对表面行为的影响。原子极化和表面结构/反应性的相互作用在电子设备中变得至关重要，例如那些使无线通信成为可能的组件变得更小。最近的研究表明，铁电畴具有畴比表面反应性。这导致了纳米制造、催化和电子设备的新概念。为了发展对区域特定行为的基本理解，BaTiO3（100）表面的结构将被确定，区域取向对吸附的影响将被量化。除了在重要技术材料方面训练学生先进的原子成像外，正在进行一项关于工程中的性别平等的研究。