Conductive films that are both stretchable and flexible could have applications in electronic devices1,2, sensors3,4, actuators5 and speakers6. A substantial amount of research has been carried out on conductive polymer composites7, metal electrode-integrated rubber substrates8-10 and materials based on carbon nanotubes and graphene1,2,11-13. 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.
Bibliographical noteFunding Information:
This work was supported by the Basic Science Research Programme (grant no. 2009-0090017) through the National Research Foundation of Korea (NRF), the Center for Nanoscale Mechatronics & Manufacturing (grant no. 2009K000160) which is a 21st-Century Frontier Research programme, and the World Class University programme (grant no. R31-2008-000-10029-0) funded by the Ministry of Education, Science and Technology, Korea.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering