无铅BaTiO3/GO/PDMS复合的柔性叉指式压电发电机的设计与试验  

Flexible interdigital piezoelectric vibration generator based on BaTiO3/GO/PDMS lead-free composite

作　　者：罗翠线 魏文伯 LUO Cui-xian;WEI Wen-bo(Information College,Shanxi University of Finance and Economics,Taiyuan 030006,China;Chengdu BOE Optoelectronics Technology Group Co.,Ltd,Chengdu 611731,China)

机构地区：[1]山西财经大学信息学院,山西太原030006 [2]成都京东方光电科技有限公司,四川成都611731

出　　处：《光学精密工程》2019年第9期2002-2010,共9页Optics and Precision Engineering

基　　金：山西省人才项目(No.201605D211020);国家留学基金资助项目(No.201706930003);山西省高等学校科技创新项目(No.2019L0473,No.2019L1009)

摘　　要：传统的压电振动发电机具有工作频带窄,压电陶瓷易碎且含铅等缺陷,无法满足当前微型传感器件可穿戴、小型化、便携式等要求。本文制备了一种高性能的钛酸钡/石墨烯/聚二甲基硅氧烷(BaTiO 3/GO/PDMS)三元无铅压电复合薄膜。GO材料的比表面较大且流动性较强,在铁电材料中易形成微电容从而提高复合薄膜的压电性能。当BaTiO 3/GO/PDMS复合薄膜中GO质量分数为0.6 wt%时,复合薄膜的介电常数和导电率分别为185和8.5×10^-5 S/m。BaTiO 3/GO/PDMS复合薄膜的剩余极化强度值为13.47μC/cm^2,比未添加GO材料时提高了28%。所制备的BaTiO 3/GO/PDMS三元复合薄膜发电机的最大输出电压达7.71 V,是BaTiO 3/PDMS二元复合薄膜发电机的2.78倍。将BaTiO 3/GO/PDMS复合柔性纳米薄膜应用于非对称叉指式压电拾振结构,填充GO后非对称叉指式拾振结构的输出电压明显增加,拾振结构的-3dB带宽由未填充GO时的8.7 Hz增加到填充GO后的11.2 Hz。所提出的BaTiO 3/GO/PDMS无铅复合柔性压电纳米发电机在柔性能量采集拾振结构方面具有巨大的应用前景。Traditional piezoelectric capturing systems have the disadvantages of narrow work bandwidths and fragile piezoelectric ceramic materials,which are unable to meet the requirements of wearable,miniaturized,or portable devices.This paper reports on high performance composite films based on BaTiO 3/Graphene Oxide/polydimethyl siloxane(BaTiO 3/GO/PDMS)with different GO content.GO with a large specific surface and strong fluidity was employed as a carbon-based conductive phase material to form micro-capacitors in the ferroelectric composite and thus enhance the piezoelectric performance of the given sample.The as-prepared BaTiO 3/GO/PDMS composite films with 0.6 wt%GO showed a dielectric constant of 185 and a conductivity of 8.5×10^-5 S/m.In addition,a remnant polarization of 13.47μC/cm^2 could be obtained,which is 28%higher than that of films of pure BaTiO 3/PDMS.In contrast,the synthesized BaTiO 3/GO/PDMS composite film exhibited a maximum output voltage of approximately 7.71 V,which is approximately 2.78 times higher than that of the film without GO.The performance of lead-free flexible piezoelectric nanogenerators was significantly enhanced after being compounded with GO materials.Moreover,an unsymmetrical interdigital harvester with BaTiO 3/GO/PDMS piezoelectric materials was fabricated.The results indicated that the output voltage of the harvester compounded with GO increased and that the-3 dB bandwidth of harvesters increased from 8.7 Hz(without GO)to 11.2 Hz(with GO).Therefore,the proposed BaTiO 3/GO/PDMS lead-free flexible composite piezoelectric nanogenerator presents great prospects in flexible energy harvesting.

关 键 词：压电发电机 BATIO 3/GO/PDMS 无铅复合材料 柔性叉指式结构 

分 类 号：TM619[电气工程—电力系统及自动化] TM282[一般工业技术—材料科学与工程]