利用声电反射法研究聚偏氟乙烯（PVDF）和聚偏氟乙烯-三氟乙烯（PVDF-TrFE）压电薄膜的宽频带电学和机电性能。
Wide-band electrical and electromechanical properties of polyvinylidene fluoride (PVDF) and polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) piezoelectric films using electro-acoustic reflectometry.
机构信息
Laboratoire de Physique et d'Étude des Matériaux (UMR8213), CNRS - ESPCI Paris, PSL University - Sorbonne University, 10 rue Vauquelin, Paris, 75005, France.
出版信息
J Acoust Soc Am. 2023 Apr 1;153(4):2499. doi: 10.1121/10.0017927.
Thin piezoelectric polymer films are used in increasingly more high frequency applications. However, they are not well characterized up to the gigahertz range. In this paper, polyvinylidene fluoride (PVDF) and polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) films are mechanically and electrically characterized using the electro-acoustic reflectometry (EAR) method from 20 MHz to 2 GHz. In addition to mechanical and electrical properties, nonuniform poling is detected in the tested PVDF-TrFE samples showing a larger piezoelectric constant in the middle of the film and thus generating even and odd resonance modes.
越来越多的高频应用开始使用薄的压电聚合物薄膜。然而，这些薄膜在千兆赫兹频段的特性还没有得到很好的描述。在本文中，使用电声反射法（EAR）在 20MHz 至 2GHz 的频率范围内对聚偏二氟乙烯（PVDF）和聚偏二氟乙烯-三氟乙烯（PVDF-TrFE）薄膜进行了机械和电气特性的表征。除了机械和电气性能外，在测试的 PVDF-TrFE 样品中还检测到了不均匀的极化，这导致了薄膜中间的压电常数更大，从而产生了偶数和奇数共振模式。
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