Effect of Pore Structure on the Piezoelectric Properties of Barium Titanate-Polyvinylidene Fluoride Composite Films
Effect of Pore Structure on the Piezoelectric Properties of Barium Titanate-Polyvinylidene Fluoride Composite Films
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DOI：
10.1016/j.nanoen.2023.108276
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发表时间：
2023-02
期刊：
影响因子：
17.6
通讯作者：
Tim Kowalchik;Fariha Khan;K. Lê;Paige Leland;S. Roundy;Roseanne Warren
中科院分区：
文献类型：
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作者：
Tim Kowalchik;Fariha Khan;K. Lê;Paige Leland;S. Roundy;Roseanne Warren
研究了多孔钛酸钡-聚偏氟乙烯（BT PVDF）颗粒-基体复合膜中压电电压的产生与PVDF孔结构和孔隙率的关系。通过凝固浴法制备的BT-PVDF复合膜具有不同的孔结构，其孔结构与凝固浴中乙醇的含量有关。随着浴中乙醇含量的增加，薄膜形貌从较高孔隙率的指状空腔转变为较低孔隙率的网状结构。指状膜具有比网状膜低的杨氏模量（224 MPavs.368 MPa），但当压缩时产生比网状膜高的压电输出电压（400 mV vs.57 mV，在3 N压缩下）。压电响应的差异归因于聚合物基体和陶瓷颗粒之间的应力传递的差异。有限元模拟表明，指状结构产生良好的有序的压缩应力，而网状结构产生不良的应力对齐。结果表明，聚合物基体和陶瓷颗粒之间的应力传递可以实现良好的排列孔结构，导致更高的压电输出。
Piezoelectric voltage generation in porous barium titanate-poly(vinylidene fluoride) (BT-PVDF) particle-matrix composite films is investigated as a function of PVDF pore structure and porosity. BT-PVDF composite films fabricatedviacoagulation bath method attain distinct pore structures depending on the ethanol content of the bath. With increasing bath ethanol content, film morphology shifts from higher porosity finger-like cavities to lower porosity mesh-like structures. Finger-like films have a lower Young’s modulus than mesh-like films (224 MPavs.368 MPa), but produce higher piezoelectric output voltage when compressed compared to mesh-like films (400 mVvs.57 mV under 3 N compression). The difference in piezoelectric response is attributed to differences in stress transfer between polymer matrix and ceramic particles. Finite element simulations reveal that finger-like structures produce well-ordered compressive stress while mesh-like structures produce poor stress alignment. The results indicate that improved stress transfer between polymer matrix and ceramic particles can be achieved with well-aligned pore structures, leading to higher piezoelectric output.