Gao Xin, Zheng Mupeng, Yan Xiaodong, Fu Jing, Hou Yudong, Zhu Mankang
Key Laboratory of Advanced Functional Materials, Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China.
Nanoscale. 2020 Feb 27;12(8):5175-5185. doi: 10.1039/d0nr00111b.
Flexible piezocomposites have emerged as promising materials for highly durable wearable devices. Here, we propose a new design strategy, namely particle alignment engineering, to develop high performance flexible piezocomposites by dielectrophoresis (DEP). An ultrahigh piezoelectric voltage coefficient (g33) of 600 × 10-3 V m N-1 is achieved by a composite of (Ba0.85Ca0.15)(Ti0.90Zr0.10)O3 (BCZT) particles aligned in a polydimethylsiloxane (PDMS) matrix. To the best of our knowledge, this g33 value is by far the highest ever achieved in piezocomposites. The significantly improved poling electric voltage applied to the BCZT particles and hugely enhanced stress-transfer capability of the aligned composite synergistically contribute to the record-high piezoelectric response in flexible piezocomposites. The fabricated flexible piezoelectric touch sensor and wearable keyboard possess an excellent sensitivity and cycling stability, which demonstrate a promising strategy for exploring high performance piezocomposites for flexible device application.
柔性压电复合材料已成为用于高耐用性可穿戴设备的有前途的材料。在此，我们提出一种新的设计策略，即粒子排列工程，通过介电泳（DEP）来开发高性能柔性压电复合材料。通过在聚二甲基硅氧烷（PDMS）基体中排列的（Ba0.85Ca0.15）（Ti0.90Zr0.10）O3（BCZT）粒子组成的复合材料，实现了600×10-3 V m N-1的超高压电电压系数（g33）。据我们所知，这个g33值是迄今为止压电复合材料中所达到的最高值。施加到BCZT粒子上的显著提高的极化电压以及排列后的复合材料极大增强的应力传递能力，协同促成了柔性压电复合材料中创纪录的高压电响应。所制备的柔性压电触摸传感器和可穿戴键盘具有出色的灵敏度和循环稳定性，这展示了一种探索用于柔性设备应用的高性能压电复合材料的有前途的策略。
