Highly conductive, printable and stretchable composite films of carbon nanotubes and silver |
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Authors: | Chun Kyoung-Yong Oh Youngseok Rho Jonghyun Ahn Jong-Hyun Kim Young-Jin Choi Hyouk Ryeol Baik Seunghyun |
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Affiliation: | School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Korea. |
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Abstract: | 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. |
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