Tubular fluoropolymer arrays with high piezoelectric response
Tubular fluoropolymer arrays with high piezoelectric response
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DOI：
10.1088/1361-665x/aa9a63
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发表时间：
2017
影响因子：
4.1
通讯作者：
S. Zhukov;Dagmar Eder-Goy;Corinna Biethan;S. Fedosov;Bai-Xiang Xu;H. von Seggern
中科院分区：
文献类型：
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作者：
S. Zhukov;Dagmar Eder-Goy;Corinna Biethan;S. Fedosov;Bai-Xiang Xu;H. von Seggern
具有带电内部空腔的聚合物称为铁驻极体，具有显著的压电效应，被认为是适合于传感器和执行器应用的软功能材料。在这项工作中，介绍了一种制作开管沟道驻极体阵列的简单方法。一组单独的氟乙烯(FEP)管在两个加热的金属板之间压缩。挤压的FEP管在+270°C下熔化在一起，得到的结构是均匀的、多管的、扁平的阵列，在极化步骤后显示出强烈的压电响应。制备的阵列具有较高的压电有源面积和非有源面积之比。实验研究了两种壁厚分别为5 0和12 0μm的阵列结构的最佳充电电压和压电系数随压力和频率的稳定性，由5 0μm厚的FEP管制成的阵列具有稳定的高压电系数d33=12 0-16 0pC N−1，在1~10 0kPa压力范围内具有0.1 Hz~10 kHz的平坦频率响应.随着壁厚增加到120μm，压电系数减小了一倍以上，这是因为同时具有更高的有效阵列刚度和更低的剩余极化。实验结果可用于优化阵列的机电性能。
Polymers with electrically charged internal air cavities called ferroelectrets exhibit a pronounced piezoelectric effect and are regarded as soft functional materials suitable for sensor and actuator applications. In this work, a simple method for fabricating piezoelectret arrays with open-tubular channels is introduced. A set of individual fluoroethylenepropylene (FEP) tubes is compressed between two heated metal plates. The squeezed FEP tubes are melted together at +270 °C. The resulting structure is a uniform, multi-tubular, flat array that reveals a strong piezoelectric response after a poling step. The fabricated arrays have a high ratio between piezoelectrically active and non-active areas. The optimal charging voltage and stability of the piezoelectric coefficients with pressures and frequency were experimentally investigated for two specific array structures with wall thickness of 50 and 120 μm. The array fabricated from 50 μm thick FEP tubes reveals a stable and high piezoelectric coefficient of d 33 = 120–160 pC N−1 with a flat frequency response between 0.1 Hz and 10 kHz for pressures between 1 and 100 kPa. An increase of wall thickness to 120 μm is accompanied by a more than twofold decrease in the piezoelectric coefficient as a result of a simultaneously higher effective array stiffness and lower remanent polarization. The obtained experimental results can be used to optimize the array design with regard to the electromechanical performance.