| 초록 |
Free-standing graphite nanosheets (GNS) film was successfully fabricated by infiltration of thermoplastic polymer into the three-dimensional (3D) macroporous interconnected GNS network structure. Highly dispersible and defect-free GNS composed of multilayered graphene sheets have been synthesized from pristine graphite in aqueous surfactant solution using a simple bead mill process. Size-controlled GNS exhibited good interfacial adhesion with the polystyrene (PS) spheres, which made it possible to have 3D GNS framework via calcination of PS template. We found that 3D GNS nanocomposite film derived from the larger PS particle and lateral size of GNS had a high thermal conductivity due to the abundant void volume to fill the GNS and a low boundary scattering attributed to long phonon mean free path. When the content of GNS was 9.1 wt%, the thermal conductivity of the nanocomposite film reached ca. 4.311 W/mK, which is 179% increases in comparison with that of randomly mixing the 9.9 wt% GNS in the polymer matrix. The ability to control the lateral size, thickness and 3D macroporous interconnected graphene framework in polymer matrix is a great opportunity to advance commercialization for thermal conductive materials using graphene in a high-quality, scalable production setting. |
