Preparation of magnetic iron particle doped expanded graphite andits interaction with millimeter wavelength radiation

Magnetic iron particle-doped expanded graphite was prepared by dipping, stirring and standing anexpandable graphite for5-8h in ferrocene then expanding at500℃. The surface morphology and composition ofthe expanded graphite were characterized by SEM and elemental analysis while the magnetization curves, mag-netic susceptibility and the attenuation properties for an8mm wavelength electromagnetic signal were character-ized by a vibration magnetometer. Results showed that ferric oxide was deposited on the surface of the expandedgraphite. The average magnetic intensity of the expanded graphite prepared is higher than8emu/g under a mag-netic field intensity of0-7.958×105A/m. The largest attenuation is over-10dB and its mass extinction coeffi-cient is over1.0g/m2in the wave length of military radar, which is better than a current millimeter wave radarshielding material.