Experimental Investigation of Fundamental Mechanical Behavior of Silicon Nanowires

硅纳米线基本机械行为的实验研究

• 批准号: 1301193
• 负责人: Yong Zhu
• 金额: $ 32.43万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1301193&HistoricalAwards=false
• 关键词: Experimental; Investigation; Fundamental; Mechanical; Behavior

This research is about the correlation between the size effects of silicon nanowires on elasticity, fracture, and their brittle to ductile transition.. In-situ scanning/transmission electron microscopy resonance and tensile testing on the same single NWs will be conducted to measure the elastic behavior. A statistical, Weibull-type, probability model will be employed to analyze the fracture data and identify fracture origins with the assistance of real-time and post-mortem microscopy analyses. In-situ thermomechanical testing done in-situ, in a Transmission Electron Microscope using a novel microfabricated testing stage will be used to probe the brittle to ductile transition.If successful, the proposed research has potential to improve flexible and stretchable electronics, improve energy conversion and storage. It is anticipated that the experimental results will be used in a collaborative way to develop atomistic simulations that will pin down the mundamental mechnisms of nanoscale elasticity, fracture and brittle to ductile transition. In addition, the novel experimental tools and methods developed in this project (e.g., the microfabricated thermomechanical testing stage) can be used to understand the properties of a broad range of nanostructures. From a teaching perspective, this work will be: 1) integrated into undergraduate and graduate courses that PI offers at NCSU (including a NSF supported undergraduate nanotechnology laboratory course), and web-based dissemination of the new course module; 2) used for training of graduate and undergraduate students for multidisciplinary research with involvement of women and underrepresented minorities; 3) used for collaboration with the Engineering Place program at North Carolina State University to develop an interactive demonstration module and present it to K-12 students.

这项研究是关于硅纳米线对弹性，断裂的大小影响以及它们脆性与延性过渡的脆性。 将采用统计，Weibull类型的概率模型来分析断裂数据并在实时和验尸显微镜分析的帮助下识别断裂起源。现场的热力学测试对原位进行，在传输电子显微镜中使用新型的微生物测试阶段将用于探测脆性的脱氧化转变。如果成功，拟议的研究有可能改善柔性和可拉伸的电子设备，改善能量转换和存储。 预计实验结果将以协作的方式使用来开发原子模拟，以固定纳米级弹性，裂缝和脆性延性延性过渡的统一机械性。此外，该项目中开发的新型实验工具和方法（例如，微生物制作的热机械测试阶段）可用于了解广泛的纳米结构的特性。从教学角度来看，这项工作将是：1）PI在NCSU提供的本科和研究生课程（包括NSF支持的本科纳米技术实验室课程），以及基于Web的新课程模块的传播； 2）用于培训研究生和本科生的多学科研究，与妇女和代表性不足的少数群体有关； 3）与北卡罗来纳州立大学的工程场所计划合作，以开发一个互动演示模块，并将其呈现给K-12学生。