IEEE Trans Ultrason Ferroelectr Freq Control. 2013 Oct;60(10):2142-53. doi: 10.1109/TUFFC.2013.2805.
Polymeric materials have been widely used in electronic and electromechanical transducer applications. Because of their low elastic modulus, it is quite challenging to accurately characterize the electric-field-induced strain and elastic modulus by conventional contact methods. In this paper, a piezoelectric lead zirconate titanate (PZT) fiber-composite-based cantilever strain sensor has been investigated to accurately characterize the electric-field-induced strain response in the out-of-plane direction of soft electroactive polymer samples. By choosing appropriate substrate material and the thickness ratio of the fiber composite to the substrate, this strain sensor can be optimized to provide high sensitivity and high flexibility simultaneously. The high voltage sensitivity can be attributed to partial decoupling of the longitudinal and transverse piezoelectric responses, the improved piezoelectric coefficient and small dielectric permittivity. The high flexibility is due to the reduced flexural spring constant of the composite-based cantilever device. Both theoretical modeling of the PZT fiber-composite-based cantilever device and experimental verification are performed in this work. The results indicate that the piezoelectric PZT fiber-composite-based cantilever strain sensor can accurately characterize the electric-field-induced small strain in electroactive soft polymers with high reliability.
高分子材料在电子和机电换能器应用中得到了广泛的应用。由于其弹性模量低，通过传统的接触方法来准确地描述电场诱导应变和弹性模量是极具挑战性的。在本文中，研究了一种基于压电锆钛酸铅（PZT）纤维复合材料的悬臂梁应变传感器，以精确地描述软电活性聚合物样品的面外方向的电场诱导应变响应。通过选择合适的基底材料和纤维复合材料与基底的厚度比，可以优化这种应变传感器，使其同时具有高灵敏度和高柔韧性。高电压灵敏度可归因于纵向和横向压电响应的部分解耦、改进的压电系数和较小的介电常数。高柔韧性是由于基于复合材料的悬臂器件的弯曲弹簧常数减小。在这项工作中进行了基于 PZT 纤维复合材料的悬臂器件的理论建模和实验验证。结果表明，压电 PZT 纤维复合材料的悬臂梁应变传感器可以高可靠性地精确地描述电活性软聚合物中的电场诱导小应变。
