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.

本研究是关于硅纳米线的尺寸效应对弹性，断裂，和它们的脆韧性转变之间的相关性。将对相同的单个纳米线进行原位扫描/透射电子显微镜共振和拉伸测试以测量弹性行为。 将采用统计、威布尔型概率模型分析骨折数据，并在实时和尸检显微镜分析的帮助下识别骨折来源。在透射电子显微镜中进行的原位热机械测试将使用一种新型的微制造测试平台来探测脆韧性转变。如果成功，拟议的研究有可能改善柔性和可拉伸电子产品，改善能量转换和存储。 预计实验结果将以合作的方式用于开发原子模拟，以确定纳米级弹性，断裂和脆性到韧性转变的基本机制。此外，本项目开发的新实验工具和方法（例如，微加工热机械测试阶段）可用于理解宽范围的纳米结构的性质。从教学的角度来看，这项工作将：1）整合到本科和研究生课程，PI在NCSU提供（包括国家科学基金会支持的本科生纳米技术实验室课程），并在网上传播新的课程模块; 2）用于培训研究生和本科生进行多学科研究，并让妇女和代表性不足的少数民族参与; 3）用于与北卡罗来纳州州立大学的工程场所项目合作，开发一个交互式演示模块，并将其呈现给K-12学生。