Xia Yanlong, Ji Yun, Liu Yuan, Wu Li, Yang Ya
CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, P. R. China.
School of Resources Environment and Materials, Center on Nanoenergy Research, Guangxi University, Nanning 530004, Guangxi, P. R. China.
ACS Appl Mater Interfaces. 2022 Aug 17;14(32):36763-36770. doi: 10.1021/acsami.2c09767. Epub 2022 Aug 8.
The rapid development of the automotive and aerospace industries has led to an increasingly urgent need for electromechanical coupling materials and devices. Here, we have demonstrated the tunable piezo-flexoelectric effect in ferroelectric BaSrTiO materials for scavenging vibration energy. The positive peak output current of an ITO/BaSrTiO/Ag cantilever device based on the flexoelectric effect is only 45 nA at room temperature, which is promoted to 90 nA by the piezo-flexoelectric effect. In addition, the piezo-flexoelectric current of the device can be further boosted to 270 nA by increasing the working temperature to 41.0 °C with a corresponding enhancement ratio of 348.28%. The significantly improved piezo-flexoelectric current is ascribed to the ultrahigh dielectric constant, which is related to the tetragonal-cubic phase transition of the BaSrTiO materials. This work reveals the temperature-modulated piezo-flexoelectric effect in ferroelectric BaSrTiO materials, providing a convenient route for scavenging and sensing of vibration energy.
汽车和航空航天工业的快速发展导致对机电耦合材料和器件的需求日益迫切。在此，我们展示了铁电BaSrTiO材料中用于收集振动能量的可调压电-挠曲电效应。基于挠曲电效应的ITO/BaSrTiO/Ag悬臂器件在室温下的正峰值输出电流仅为45 nA，通过压电-挠曲电效应可提高到90 nA。此外，通过将工作温度提高到41.0°C，该器件的压电-挠曲电流可进一步提高到270 nA，相应的增强比为348.28%。显著提高的压电-挠曲电流归因于超高介电常数，这与BaSrTiO材料的四方-立方相变有关。这项工作揭示了铁电BaSrTiO材料中温度调制的压电-挠曲电效应，为振动能量的收集和传感提供了一条便捷途径。
