Highly conductive, printable and stretchable composite films of carbon nanotubes and silver
Highly conductive, printable and stretchable composite films of carbon nanotubes and silver
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DOI：
10.1038/nnano.2010.232
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发表时间：
2010-12-01
影响因子：
38.3
通讯作者：
Baik, Seunghyun
中科院分区：
文献类型：
--
作者：
Chun, Kyoung-Yong;Oh, Youngseok;Baik, Seunghyun
可拉伸且柔韧的导电薄膜可应用于电子设备(1,2)、传感器(3,4)、执行器(5) 和扬声器(6)。在导电聚合物复合材料(7)、集成金属电极的橡胶基材(8-10)以及基于碳纳米管和石墨烯的材料(1,2,11-13)方面已经进行了大量的研究。在这里，我们展示了由微米级银片和装饰有自组装银纳米颗粒的多壁碳纳米管组成的高导电性、可印刷和可拉伸的混合复合材料。纳米管被用作一维、柔性和导电支架，在银片之间构建有效的电网络。该纳米复合材料包含聚偏二氟乙烯共聚物，采用热轧技术制成，杂化银纳米管复合材料的最大电导率在0%应变下为5,710 S cm(-1)，在140%应变下为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确定拉伸时电导率如何变化的关键参数。
Conductive films that are both stretchable and flexible could have applications in electronic devices(1,2), sensors(3,4), actuators(5) and speakers(6). A substantial amount of research has been carried out on conductive polymer composites(7), metal electrode-integrated rubber substrates(8-10) and materials based on carbon nanotubes and graphene(1,2,11-13). 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.