School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
Nat Nanotechnol. 2010 Dec;5(12):853-7. doi: 10.1038/nnano.2010.232. Epub 2010 Nov 28.
Conductive films that are both stretchable and flexible could have applications in electronic devices, sensors, actuators and speakers. A substantial amount of research has been carried out on conductive polymer composites, metal electrode-integrated rubber substrates and materials based on carbon nanotubes and graphene. Here we present highly conductive, printable and stretchable hybrid composites composed of micrometre-sized silver flakes and multiwalled carbon nanotubes decorated with self-assembled silver nanoparticles. The nanotubes were used as one-dimensional, flexible and conductive scaffolds to construct effective electrical networks among the silver flakes. The nanocomposites, which included polyvinylidenefluoride copolymer, were created with a hot-rolling technique, and the maximum conductivities of the hybrid silver-nanotube composites were 5,710 S cm⁻¹ at 0% strain and 20 S cm⁻¹ at 140% strain, at which point the film ruptured. Three-dimensional percolation theory reveals that Poisson's ratio for the composite is a key parameter in determining how the conductivity changes upon stretching.
具有拉伸和柔韧性的导电薄膜在电子设备、传感器、致动器和扬声器中有应用。大量的研究已经在导电聚合物复合材料、金属电极集成橡胶基底以及基于碳纳米管和石墨烯的材料上展开。在这里，我们展示了由微米级银薄片和用自组装银纳米粒子修饰的多壁碳纳米管组成的高导电性、可打印和可拉伸的混合复合材料。纳米管用作一维、灵活和导电的支架，在银薄片之间构建有效的电子网络。纳米复合材料包括聚偏二氟乙烯共聚物，是通过热轧技术制造的，混合银纳米管复合材料的最大电导率在 0%应变时为 5710 S cm⁻¹，在 140%应变时为 20 S cm⁻¹，此时薄膜破裂。三维渗流理论表明，复合材料的泊松比是决定拉伸时电导率如何变化的关键参数。
