纳米二氧化硅/聚偏氟乙烯复合材料薄膜的压电性能  

Piezoelectric Properties of Nano-SiO2/Poly （Vinylidene Fluoride） Composite Film

作　　者：赵旸周 袁卫锋[1] ZHAO Yangzhou;YUAN Weifeng(School of Manufacturing Science and Engineering. Southwest University of Science and Technology, Mianyang 621010, China)

机构地区：[1]西南科技大学制造科学与工程学院

出　　处：《材料科学与工程学报》2019年第4期599-603,618,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(11472232);西南科技大学研究生创新基金资助项目(17ycx128)

摘　　要：本研究介绍了纳米二氧化硅/聚偏氟乙烯(SiO2/PVDF)压电复合材料的制备和性能。为提高材料的压电性能,在PVDF中添加纳米SiO2颗粒,使用溶液流延法制成薄膜,采用高倍率单轴拉伸的方法增加PVDF材料中β相的含量,之后在薄膜两面涂布导电银浆电极,并在高电压下对材料进行极化。研究中使用悬臂梁振动试验台对压电复合材料薄膜的性能进行了一系列测试,分析了纳米SiO2颗粒含量以及悬臂梁振动频率对SiO2/PVDF薄膜开路电压的影响规律,并对悬臂梁-压电膜能量转换系统的电能采集能力进行了评估。结果表明,添加纳米SiO2颗粒可以显著提高该PVDF复合材料的压电性能。由于SiO2/PVDF薄膜为柔性材料,因此可以被更方便地应用于环境小能量采集或者自我供能的可穿戴装置。This work focuses on the fabrication and the piezoelectric properties of the nano-silicon dioxide/polyvinylidene fluoride(SiO2/PVDF) composite. In order to improve the piezoelectricity of the PVDF film, nano-SiO2 particles are added into the PVDF matrix during the solution casting process. The film is stretched uniaxially at high elongation rate to increase the amount of β-phase in the composite, and then polarized at high voltage after being coated with conductive silver paste which performs as electrodes. In the study, cantilever beam system was adopted and a series of tests were set up to investigate the performance of the piezoelectric composite films. The energy harvesting capacity of the energy converter was also analyzed. It is found that the open-circuit voltage generated by the piezoelectric films is dependent on both the content of the nano-SiO2 particles and the vibration frequency of the beam. Experimental results indicate that the presence of the nano-SiO2 particles can increase the piezoelectricity of the SiO2/PVDF composite significantly. The material may have a great potential to be applied to small energy harvesting and self-powered wearable devices.

关 键 词：纳米材料 复合材料 压电性 小能量采集 

分 类 号：TB332[一般工业技术—材料科学与工程] TM282[电气工程—电工理论与新技术]