Wang Zhaoyu, Hu Jie, Suryavanshi Abhijit P, Yum Kyungsuk, Yu Min-Feng
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, USA.
Nano Lett. 2007 Oct;7(10):2966-9. doi: 10.1021/nl070814e. Epub 2007 Sep 26.
Direct tensile mechanical loading of an individual single-crystal BaTiO(3) nanowire was realized to reveal the direct piezoelectric effect in the nanowire. Periodic voltage generation from the nanowire was produced by a periodically varying tensile mechanical strain applied with a precision mechanical testing stage. The measured voltage generation from the nanowire was found to be directly proportional to the applied strain rate and was successfully modeled through the consideration of an equivalent circuit for a piezoelectric nanowire under low-frequency operation. The study, besides demonstrating a controlled experimental method for the study of direct piezoelectric effect in nanostructures, implies also the use of such perovskite piezoelectric nanowires for efficient energy-harvesting applications.
实现了对单个单晶钛酸钡（BaTiO₃）纳米线的直接拉伸机械加载，以揭示纳米线中的直接压电效应。通过精密机械测试平台施加周期性变化的拉伸机械应变，在纳米线中产生周期性电压。发现纳米线产生的测量电压与施加的应变速率成正比，并通过考虑低频运行下压电纳米线的等效电路成功建模。该研究除了展示一种用于研究纳米结构中直接压电效应的可控实验方法外，还意味着将这种钙钛矿压电纳米线用于高效能量收集应用。
