| 초록 |
Thin films of multiwalled carbon nanotube (MWCNT)-poly (methyl methacrylate) (PMMA) composites were synthesized to study electrical properties of metal-insulator transition. MWCNTs were synthesized by conventional chemical vapor deposition method. MWCNTs of various weight concentration were dispersed in insulating PMMA matrix by high power sonication for 12 h. For charge transport properties of the composites, dc conductivity (σdc) and its temperature dependence [σdc(T)] were measured in the range of 0.3 K - 300 K. The σdc at room temperature increased as MWCNT concentration increased, which shows typical percolation behavior. The σdc(T) of the composites with high concentration of MWCNTs shows metallic behavior at low temperatures which originated from metallic property of one dimensional carbon nanotubes. We synthesized the spin-coated of composites at low concentrations of MWCNTs onto glass substrate to examine electrostatic application. AC dielectric constant of the composites was measured in the range of 10 Hz - 2MHz to study charge storage capability. |
