The Frabrication Of Hybrid Perovskite Based Nonacomposite Films And Their Piezoelectric Properties

Poly?vinylidene fluoride??PVDF,-[CF₂-CH₂]-?exhibits strong piezoelectric properties at room temperature,which originate from the spontaneous polarization.The piezoelectric properties of PVDF films can be enhanced by embedding high piezoelectric materials.In this work,we prepared organic-inorganic perovskite/PVDF nanocomposite film through an in situ fabrication method and studied their piezoelectric properties.In addition,the enhanced piezoelectric properties were also explained by applying first-Principles calculations.The achieved progresses are as follows:?1?Piezoelectric properties of organic-inorganic perovskite and PVDF nanocomposite films.The perovskite/PVDF nanocomposite films were fabricated using an in situ fabrication strategy.Obvious enhanced piezoelectric output in copper based perovskite MA₂CuX₄/PVDF composite film was obtained.By optimizing the mass fraction of MA₂CuX₄?X=Cl,Br?filler in the polymer matrix,the nearly 7-fold enhanced piezoelectric output of MA₂CuCl₄/PVDF nanocomposite film was achieved.?2?An assembly enhanced mechanism between organic-inorganic perovskite and PVDF was proposed to explain the enhanced piezoelectric performance in perovskite/PVDF nanocomposite films.The calculated piezoelectric coefficient e₃₃ of MA₂CuCl₄ is-3.5 C m^-2,which is close to the well-developed PZT based piezoelectric material.