Mechanical and Piezoelectric Characterization of ZnO Nanowires for Energy Harvesting Applications

用于能量收集应用的 ZnO 纳米线的机械和压电特性

• 批准号: 0826341
• 负责人: Yong Zhu
• 金额: --
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-01-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0826341&HistoricalAwards=false
• 关键词: Mechanical; Piezoelectric; Characterization; ZnO; Nanowires

Piezoelectric nanowires have been recently demonstrated for converting mechanical energy (e.g., ambient vibration or body movement) into electricity. However, the fundamentals involved in the energy harvesting process are not yet clearly understood due to the lack of well-characterized electromechanical properties of these nanowires. The objective of this research is to investigate the coupling between mechanical and electrical properties of ZnO nanowires. A microelectromechanical platform will be developed to test the mechanical and piezoelectric properties of ZnO nanowires at both quasi-static and dynamic conditions. The experiments will be carried out in-situ in scanning electron microscopy to quantitatively measure their mechanical properties and probe their fracture mechanisms. The piezoelectric constants will be measured simultaneously. Fundamental issues of piezoelectric nanowires, such as size effects and strain-gradient effects (uniaxial loading versus bending) on electromechanical coupling, will be addressed.If successful, the proposed research will: (1) Provide a wealth of experimental data on the mechanical and piezoelectric properties of ZnO nanowires at various time scales and loading conditions of relevance to the vibration energy harvesting. (2) Enable further understanding of the energy harvesting process at the nanoscale and offer better design guidelines for nanoscale energy harvesters. (3) Develop universal nano instrumentation for systematic characterization of electromechanical-coupled properties of other 1D nanostructures. (4) Train future nano researchers in nanoscale property characterization and nanodevice design by the integration of the proposed research into the curriculum. (5) Lead to the involvement of underrepresented minorities in the nanoengineering research and education through local education and outreach activities.

最近已经证明了压电纳米线，以将机械能（例如环境振动或身体运动）转化为电力。但是，由于缺乏这些纳米线的特征良好的机电特性，尚未清楚地了解参与能量收集过程的基本面。这项研究的目的是研究ZnO纳米线的机械性能和电气性能之间的耦合。将开发一个微电机电平台，以测试ZnO纳米线在准静态和动态条件下的机械和压电性能。实验将在扫描电子显微镜中进行原位进行定量测量其机械性能并探测其断裂机制。压电常数将同时测量。将解决压电纳米线的基本问题，例如尺寸效应和应变梯度效应（单轴载荷与弯曲）对机械耦合的效果。 （2）能够进一步了解纳米级的能源收集过程，并为纳米级能量收割机提供更好的设计准则。 （3）开发通用纳米仪器，以系统地表征其他一维纳米结构的机电耦合性能。 （4）通过将拟议的研究集成到课程中，培训未来的纳米研究人员在纳米级的财产表征和纳米式设计方面进行培训。 （5）通过当地的教育和外展活动，导致代表性不足的少数群体参与纳米工程研究和教育。