摘要
ln-situ fabricated perovskite nanocrystals in polymeric matrix provide new generation composite mate- rials for plenty of cutting edge technology. In this work, we report the in-situ fabrication of copper halide perovskite （MA_2CuCI_4, MA：CH_3NH＋3） embedded poly（vinylidene fluoride） （PVDF） composite films. The optimized MA_2CuCI_4/PVDF composite films exhibit greatly enhanced piezo-response in comparasion with pure PVDF films. The enhancements were invesitgated and explained by applying piezo-response force microscopy （PFM） measurements and density functional theory （DFT） caculations. We proposed that the high piezoelectric properties of MA_2CuCI_4/PVDF composite films could be related to the large Cu off-centering displacement, the strong interactions between MA_2CuCI_4 and PVDF as well as large stress concentration around the MA_2CuCI_4 particles in the films. These piezoelectric composite films are expected to be suitable functional materials for flexible and/or wearable niezoelectrics.
In-situ fabricated perovskite nanocrystals in polymeric matrix provide new generation composite materials for plenty of cutting edge technology. In this work, we report the in-situ fabrication of copper halide perovskite(MA_2CuCl_4, MA:CH_3NH_3^+) embedded poly(vinylidene fluoride)(PVDF) composite films. The optimized MA_2CuCl_4/PVDF composite films exhibit greatly enhanced piezo-response in comparasion with pure PVDF films. The enhancements were invesitgated and explained by applying piezo-response force microscopy(PFM) measurements and density functional theory(DFT) caculations. We proposed that the high piezoelectric properties of MA_2CuCl_4/PVDF composite films could be related to the large Cu off-centering displacement, the strong interactions between MA_2CuCl_4 and PVDF as well as large stress concentration around the MA_2CuCl_4 particles in the films. These piezoelectric composite films are expected to be suitable functional materials for flexible and/or wearable piezoelectrics.
基金
supported by the National Key Research and Development Program of China (2017YFB0404603)
the National Natural Science Foundation of China (61722502)
the support from the National Natural Science Foundation of China (11572040)
the Thousand Young Talents Program of China
