多壁碳纳米管/聚偏氟乙烯纳米复合材料薄膜在直流和交流电路中的力-电特性  

The Electro-Mechanical Characteristics of Multi-Walled Carbon Nanotube/Poly (Vinylidene Fluoride) Nanocomposite Films under Direct and Alternating Current Circuits

作　　者：赵朝阳 赵旸周 唐强 袁卫锋[1] ZHAO Chaoyang;ZHAO Yangzhou;TANG Qiang;YUAN Weifeng(Key Laboratory of Testing Technology for Manufacturing Process,Ministry of Education,School of Manufacturing Science and Engineering, Southwest University and Technology,Mianyang Sichuan 621010,China)

机构地区：[1]西南科技大学制造科学与工程学院制造过程测试技术省部共建教育部重点实验室,四川绵阳621010

出　　处：《传感技术学报》2018年第3期329-333,共5页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(11472232);西南科技大学研究生创新基金项目(16ycx109)

摘　　要：采用溶液流延法制作了一种多壁碳纳米管/聚偏氟乙烯(MWCNT/PVDF)薄膜应变片并研究其在直流和交流电路中的力-电特性。结果发现:(1)应变片可以承受20%的应变而不断裂(2)在直流电路中应变片具有压阻特性,但是其应变-电阻之间的关系表现出明显的非线性。(3)在交流电路中,当应变为零时,其介质损耗角正切(tanδ)与测试频率和MWCNT含量有关,但与测试电压无关。(4)应变不为零时,tanδ随应变的变化而变化,且tanδ变化率和应变呈线性变化关系。MWCNT/PVDF复合材料的这种力-电特性为设计大应变线性柔性传感器件提供了一种很好的方法。Multi-walled carbon nanotube(MWCNT)/Poly(vinylidene fluoride)(PVDF)films were fabricated by using solution casting method.The electro-mechanical characteristic of the filmsunder direct and alternating current circuits were studied experimentlly.The research findings include:①The strain gauges made of the MWCNT/PVDF films can sustain over 20%strain without any damage.②In direct current circuit,the strain gauge possesses piezoresistivity,but the strain-resistance relationship is nonlinear.③In alternating current circuit,the dielectic loss tangent is dependent on the test frequency and the MWCNT content at zero strain,but it has nothing to do with the test voltage.④When the strain is not zero,the dielectric loss tangent changes with the viriation of the strain.Moreover,the change rate of the dielectric loss tangent is linearly proportional to the strain.The electro-mechanical characteristics of MWCNT/PVDF composite provides a promising method to design linear and flexible stain sensors for large strain detection.

关 键 词：多壁碳纳米管 纳米复合材料 介质损耗角正切 应变片 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]