Guangdong Provincial Key Laboratory of Materials for High Density Electronic Packaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen 518055, China.
Department of Nano Science and Technology Institute, University of Science and Technology of China , Suzhou 215123, China.
ACS Appl Mater Interfaces. 2016 Dec 28;8(51):35545-35551. doi: 10.1021/acsami.6b11492. Epub 2016 Dec 14.
Overvoltage protection is becoming increasingly important because of miniaturization and multifunctionality of electronic devices. Flexible, easily processable materials with nonlinear and reversible I-V behavior are highly desired. In this study, hybrid nanoparticles of ZnO-decorated carbon nanotubes (CNT-ZnO) were synthesized via a sol-gel hydrothermal process employed in an epoxy matrix to prepare composites. Microstructure analysis demonstrated that ZnO nanoparticles were well-bonded to the surface of CNT. The CNT-ZnO/epoxy composites exhibited nonlinear I-V behavior under increasingly applied voltage with a nonlinear coefficient of 5.01 (10 wt % filler loading). More importantly, the composites possessed excellent reversibility from dielectric to conductor and vise versa in the recycling of increase and decrease of applied electric field, in contrast to the poor recoverability of pure CNT-filled epoxy. The mechanism of the nonlinear I-V behavior and reversibility was investigated and discussed. A simple circuit was fabricated, which verified well the protection function of the CNT-ZnO/polymer composites.
由于电子设备的小型化和多功能化，过电压保护变得越来越重要。人们非常希望使用具有非线性和可逆 I-V 行为的柔性、易于加工的材料。在这项研究中，通过溶胶-凝胶水热工艺在环氧树脂中合成了 ZnO 修饰的碳纳米管（CNT-ZnO）杂化纳米粒子，以制备复合材料。微观结构分析表明，ZnO 纳米粒子很好地结合在 CNT 的表面上。在施加电压逐渐增加的情况下，CNT-ZnO/环氧树脂复合材料表现出非线性 I-V 行为，非线性系数为 5.01（填充剂负载为 10wt%）。更重要的是，与纯 CNT 填充环氧树脂较差的可恢复性相比，复合材料在施加电场增加和减少的循环中表现出从介电体到导体再到导体的优异可逆性。研究并讨论了非线性 I-V 行为和可逆性的机制。还制作了一个简单的电路，该电路很好地验证了 CNT-ZnO/聚合物复合材料的保护功能。
