Materials World Network: Novel Strain Control in Thick Epitaxial Nancomposite Films

材料世界网络：厚外延纳米复合材料薄膜中的新型应变控制

• 批准号: 0709831
• 负责人: Haiyan Wang
• 金额: $ 27万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0709831&HistoricalAwards=false
• 关键词: Materials; World; Network; Novel; Strain

This Materials World Network project explores the growth, structure and physical properties of vertically strain-controlled nanocomposite (VSCN) systems in epitaxial thin film form. The proposed research opens the door to a brand-new avenue for lattice strain control in two-phase nanocomposites, whereby the nanocolumns control the strain vertically in one another, independent of the interface. The elimination of interface control in the VSCN systems allows much thicker strained films (300 nm) to be grown compared to lateral heteroepitaxial systems and thus allows a whole range of novel functional device possibilities. This project involves extensive collaboration between Texas A & M University (Dr. Wang) and the University of Cambridge (Dr. Driscoll) in the United Kingdom.The goal of this joint program is to grow and understand VSCN epitaxial films for novel applications. The objectives include: 1) to develop a set of guidelines for predicting possible 2-phase nancomposite systems; 2) to utilize complementary deposition techniques to grow films of the predicted systems; 3) to determine the factors which control the VSCN architectures; and 4) to demonstrate one or two single phase property enhancements or novel multifunctionalities. This interdisciplinary effort combines research expertise from both universities. Novel VSCN systems will first be explored using chemical vapor deposition, CVD (Cambridge) and then, pulsed laser deposition, PLD (Texas). Various characterization techniques, such as high resolution XRD (Cambridge) and TEM (combined with STEM and EELS compositional analysis, Texas), as well as electrical and magnetic property measurements, will be utilized to investigate the structural, and functional properties of these VSCN systems. The intellectual merit of the proposed research is the fundamental understanding of vertical strain-control in VSCN systems, which allows growth of strained layers far in excess of the conventional critical thickness. The project will have broad impact by 1) offering international multidisciplinary training to the researchers involved in the program and 2) enhancing the materials science and engineering curricula at both universities. The research results will be quickly disseminated to a much broader audience by (a) involving high school teachers in this research project, (b) involving under-represented groups in materials science and engineering and (c) attracting high school students into Materials Science program through the outreach programs available at both universities.

该材料世界网络项目探讨了外延薄膜形式中垂直应变控制的纳米复合材料（VSCN）系统的生长，结构和物理特性。拟议的研究为两相纳米复合材料中的晶格应变控制打开了大门，因此，纳米船体逐步控制菌株，与界面无关。 VSCN系统中界面控制的消除使与侧向异质膜系统相比，可以生长更厚的应变膜（300 nm），从而允许各种新型的新功能设备可能性。该项目涉及德克萨斯A＆M大学（王博士）和剑桥大学（Driscoll博士）在英国的广泛合作。该联合计划的目的是成长并了解用于新型应用的VSCN外延电影。目标包括：1）制定一组指南，以预测可能的2阶段Nancomposite系统； 2）利用互补的沉积技术来种植预测系统的膜； 3）确定控制VSCN体系结构的因素； 4）证明一种或两种单相性能增强或新颖的多功能性。这项跨学科的工作结合了两所大学的研究专业知识。新型VSCN系统将首先使用化学蒸气沉积，CVD（剑桥），然后是脉冲激光沉积，PLD（德克萨斯州）。各种表征技术，例如高分辨率XRD（剑桥）和TEM（与STEM和EELS组成分析，得克萨斯州）以及电气和磁性特性测量结果，可用于研究这些VSCN系统的结构和功能性能。 拟议的研究的智力优点是对VSCN系统中垂直应变控制的基本了解，这允许应变层的生长远超过常规的临界厚度。该项目将在1）向参与该计划的研究人员提供国际多学科培训以及2）增强两所大学的材料科学和工程课程。通过（a）参与该研究项目的高中教师，（b）涉及材料科学和工程中的代表性不足的群体以及（c）通过两所大学提供的外展计划吸引高中生参加材料科学计划。