FABRICATIONS AND MECHANICAL PROPERTIES OF SUPER STRONG FUNCTIONAL NANOSTRUCTURES

超强功能纳米结构的制备和力学性能

• 批准号: 355552-2012
• 负责人: Tsui, Ting
• 金额: $ 2.11万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=509937
• 关键词: FABRICATIONS; MECHANICAL; PROPERTIES; SUPER; STRONG

The functionality, lifetime, and commercial success of nanoelectronics ultimately depend on our ability to successfully design and engineer the mechanical properties of the small scale structures that comprise them. To that end, it is imperative to gain a fundamental understanding of the physical properties and reliability of nanoelectronics as a function of size in the sub-micron to nanometer scales. However, strengthening techniques that work well in bulk are often difficult to implement at the nanoscale level. For example, bulk nanocrystalline Ni specimens exhibit superior mechanical strength, but because of the grain boundary sliding, they soften when the sample is reduced to smaller than 100 nm. Conversely, well annealed single crystalline structures, which are soft in bulk, exhibit superior mechanical strength as the sample dimension decreases. Some proposed mechanisms recently suggested to explain this strength size effect include the dislocation starvation effect, stochastic behaviors, and nano-twin formations. These mechanism theories are unique to nanostructures; however, they are still in their infancy and need further development. This study has three objectives: 1) explore the alloying and precipitation effects on the mechanical properties of metallic nanostructures; 2) investigate the carbon nanotube-metal matrix nanocomposite mechanical deformation behaviors; and 3) develop guidelines to fabricate super-strong nanostructures. The proposed project will be conducted in our research facility using a state-of-the-art in-situ nanoindenter installed within a field-emission scanning electron microscope. This is believed to be the first and only in-situ nanoscale mechanical testing instrument in Canada, and one of only a few in the world. We anticipate that the proposal project will lead to an in-depth understanding of the solute/precipitation effect and the CNT influences on the strength of nanostructures, making it possible to develop structures that are strong and able to fulfill the functional behaviors.

纳米电子学的功能，寿命和商业成功最终取决于我们成功设计和设计构成它们的小规模结构的机械性能的能力。为此，必须对纳米电子学的物理特性和可靠性获得基本理解，这是亚微米中大小到纳米尺度的大小的函数。但是，在纳米级级别上通常难以实施加强批量工作的加强技术。例如，散装纳米晶体NI标本具有优异的机械强度，但是由于晶界滑动，当样品还原至小于100 nm时，它们会变软。相反，随着样品尺寸的降低，散装柔软的良好退火单晶结构具有较高的机械强度。最近建议解释这种强度大小效应的一些提议的机制包括脱位饥饿效应，随机行为和纳米旋风形成。这些机制理论是纳米结构独有的。但是，他们仍处于起步阶段，需要进一步发展。这项研究有三个目标：1）探索金属纳米结构机械性能的合金和降水影响； 2）研究碳纳米管基质基质纳米复合机械变形行为； 3）制定制造超强纳米结构的准则。拟议的项目将在我们的研究设施中使用安装在现场发射扫描电子显微镜中的最先进的纳米Indententer进行。据信这是加拿大的第一个也是唯一的纳米纳米机械测试工具，也是世界上少数几个。我们预计该提案项目将导致对溶质/降水效应的深入了解以及CNT对纳米结构强度的影响，从而有可能开发强大并能够实现功能行为的结构。