In this work, dopamine (DA) coated nano-TiO₂ (DA@TiO₂) modified polyvinylidene fluoride (PVDF) piezoelectric composite films (DA@TiO₂/PVDF) with a high β-phase content are successfully fabricated by solvothermal method. The β-phase content of the DA_2.0@TiO₂/PVDF reaches 84.33%. Furthermore, DA_2.0@TiO₂/PVDF has the highest crystallinity (X_c) and melting enthalpy (ΔH). Due to synergistic effect between DA and TiO₂, the piezoelectric coefficients (d₃₃) and remnant polarization (P_r) of DA_2.0@TiO₂/PVDF composite films increase by up to 163% and 278% than that of the pure PVDF film, respectively. This work provides a new method to present promise in broadening nanometer preparation technology and improving performance of piezoelectric composites, and contributes to the study on new curved panel energy harvesters for aeroelastic vibration.

本工作采用溶剂热法成功制备了多巴胺（DA）包覆的纳米TiO ₂（DA@TiO ₂）改性聚偏二氟乙烯（PVDF）压电复合薄膜（DA@TiO ₂ /PVDF），该薄膜具有高β相含量。DA _2.0 @TiO ₂ /PVDF的β相含量达到84.33%。此外，DA _2.0 @TiO ₂ /PVDF 具有最高的结晶度（X _c）和熔化焓（Δ H）。由于DA和TiO之间协同效应₂，压电系数（d ₃₃）和剩余极化（P _{- [R} DA的）_2.0@TiO ₂ /PVDF复合薄膜比纯PVDF薄膜分别增加了163%和278%。这项工作为拓宽纳米制备技术和提高压电复合材料的性能提供了一种新方法，并有助于研究用于气动弹性振动的新型曲面面板能量收集器。