Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were system...Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated.The composite films were characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),Flourier transform infrared spectroscope(FTIR)and differential scanning calorimeter(DSC).The results show that,surface modified PZT powder(PZT@PDA)is successfully coated by polydopamine(PDA),resulting in a large number of polar groups that interact with the-CF_(2)-groups in PVDF,inducing the generation of polarβphase due to hydrogen bonding formed in the interaction.Theβphase content in composite film increases with increasing PZT@PDA content,up to 28.09%as with 5 wt.%PZT@PDA.PZT@PDA plays a role of nucleating agent to promote the generation of polar phases in the film and also acts as an impurity hindering the growth of nuclei to reduce crystallinity.Moreover,the presence of PZT@PDA in interfaces provides more sites for the occurrence of interfacial polarization and thus improving the electrical properties of films.The composite film with 5 wt.%PZT@PDA possesses the highest dielectric constant(8.61)and residual polarization value(0.6803μC/cm^(2)).展开更多
传统压电陶瓷超声传感器与电缆表面之间存在声学界面不匹配问题,而柔性压电超声传感器能够克服这一缺点、实现电缆局部放电超声信号的检测。然而持续提高柔性压电超声传感器的灵敏度,进一步降低其对超声信号的检出极限,是其走向实际应...传统压电陶瓷超声传感器与电缆表面之间存在声学界面不匹配问题,而柔性压电超声传感器能够克服这一缺点、实现电缆局部放电超声信号的检测。然而持续提高柔性压电超声传感器的灵敏度,进一步降低其对超声信号的检出极限,是其走向实际应用的关键。为实现这一目标,该文从柔性压电超声传感器的核心敏感材料(压电薄膜)的优化设计出发,研究了厚度对Pb(Zr_(0.52),Ti_(0.48))O_(3)(PZT)压电薄膜材料综合性能及其所制备的传感器灵敏度的影响。研究发现,受界面死层的影响,厚度约为1.2μm的PZT压电薄膜相较于厚度约为0.8μm、1.0μm和1.6μm的薄膜具有更大比例的(100)晶粒择优取向和更高的剩余极化,表现出最高的压电系数,更具备应用潜力。利用该厚度的PZT压电薄膜制备了柔性压电超声传感器,并用其检测在110 k V真型电缆上传播的由自动笔铅芯断裂产生的超声信号,计算得到该超声信号在交联聚乙烯绝缘层中的衰减系数为3.74 dB/m。该研究提供了一种利用压电薄膜厚度优化柔性压电超声传感器灵敏度的方法,为进一步推进柔性压电超声传感器在电缆等电力设备领域的应用提供了实验和理论基础。展开更多
基金Project(22020JJ4729)supported by the Natural Science Foundation of Hunan Province,China。
文摘Polyvinylidene fluoride/lead zirconate titanate(PVDF/PZT)composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated.The composite films were characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),Flourier transform infrared spectroscope(FTIR)and differential scanning calorimeter(DSC).The results show that,surface modified PZT powder(PZT@PDA)is successfully coated by polydopamine(PDA),resulting in a large number of polar groups that interact with the-CF_(2)-groups in PVDF,inducing the generation of polarβphase due to hydrogen bonding formed in the interaction.Theβphase content in composite film increases with increasing PZT@PDA content,up to 28.09%as with 5 wt.%PZT@PDA.PZT@PDA plays a role of nucleating agent to promote the generation of polar phases in the film and also acts as an impurity hindering the growth of nuclei to reduce crystallinity.Moreover,the presence of PZT@PDA in interfaces provides more sites for the occurrence of interfacial polarization and thus improving the electrical properties of films.The composite film with 5 wt.%PZT@PDA possesses the highest dielectric constant(8.61)and residual polarization value(0.6803μC/cm^(2)).
文摘传统压电陶瓷超声传感器与电缆表面之间存在声学界面不匹配问题,而柔性压电超声传感器能够克服这一缺点、实现电缆局部放电超声信号的检测。然而持续提高柔性压电超声传感器的灵敏度,进一步降低其对超声信号的检出极限,是其走向实际应用的关键。为实现这一目标,该文从柔性压电超声传感器的核心敏感材料(压电薄膜)的优化设计出发,研究了厚度对Pb(Zr_(0.52),Ti_(0.48))O_(3)(PZT)压电薄膜材料综合性能及其所制备的传感器灵敏度的影响。研究发现,受界面死层的影响,厚度约为1.2μm的PZT压电薄膜相较于厚度约为0.8μm、1.0μm和1.6μm的薄膜具有更大比例的(100)晶粒择优取向和更高的剩余极化,表现出最高的压电系数,更具备应用潜力。利用该厚度的PZT压电薄膜制备了柔性压电超声传感器,并用其检测在110 k V真型电缆上传播的由自动笔铅芯断裂产生的超声信号,计算得到该超声信号在交联聚乙烯绝缘层中的衰减系数为3.74 dB/m。该研究提供了一种利用压电薄膜厚度优化柔性压电超声传感器灵敏度的方法,为进一步推进柔性压电超声传感器在电缆等电力设备领域的应用提供了实验和理论基础。
