High permittivity induced by interaction between PI matrix and graphite oxide filler

- Graphite oxide was introduced to obtain GO/PI composites with a colossal permittivity.
- At 1 kHz, the permittivity of the composite with 3 wt% GO loading was up to 7179.
- During the oxidation process of GO, functional groups were grafted with the carbon framework.
- PI was further grafted to GO, inducing the formation of a large conjugation of GO/PI.
- The conjugation provided approach for electrons transportation, enhancing the polarizability and permittivity.