| 초록 |
Recently, a lot of research on EMI shielding materials has been being done in fields of electronic industries. For effective electromagnetic shielding, materials are required to have both large surface area and absorbing or reflecting capability of electro magnetic waves. In case of electromagnetic waves absorbing materials, they have to have both electric dipoles and magnetic dipoles simultaneously. Generally, the electric dipoles and the magnetic dipoles are related to a dielectric constant and a magnetic permeability, respectively. In this research, BaTiO3 with a high dielectric constant and Fe3O4 with high magnetic permeability were used to fabricate the high surface area carbon nanofiber in order to enhance the EMI shielding properties. Carbon nanowebs were prepared from PAN precursor/filler solutions by electrospinning and following carbonization process. We investigated EMI shielding properties of prepared carbon nanoweb. We measured electrical conductivity by using 4-point probe. Morphology of nanoweb was confirmed by SEM and TEM. Structure was investigated by using XRD and XPS. |
