Modulating piezoelectricity and mechanical strength <i>via</i> three-dimensional gradient structure for piezoelectric composites
Tao Yang, Weili Deng, Tian Guo, Lin Deng, Wanghong Zeng, You Wu, Shenglong Wang, Jieling Zhang, Boling Lan, Yue Sun, Long Jin, Weiqing Yang
Abstract
a non-equilibrium process integrated with a modified electrospinning and hot-pressing process to modulate the piezoelectric output and mechanical strength. The enhanced piezoelectric output together with the mechanical strength of the gradient structure are verified from both the experimental and simulation results. Ascribed to a unique three-dimensional gradient distribution, the prepared PMN-PT/PVDF nanocomposite exhibits an excellent mechanical strength (830 MPa) and piezoelectric performance (1.08 V), which are substantially higher than those of a randomly dispersed nanocomposite. The enhancement mechanism is revealed in terms of polarization, stress and crystallinity. These results of the gradient structure offer new opportunities to understand the structure-related mechanical and electrical behaviors of a nanocomposite, and support the design of a nanocomposite with overall performance.