| 초록 |
Graphene oxide-iron oxide (GO-Fe3O4) nanocomposites were synthesized by co-precipitating iron salts in the presence of exfoliated graphene oxide sheets. Graphene oxide flakes was exfoliated by ultrasonication to attain an aqueous dispersion of GO. The GO-Fe3O4 nanocomposites were synthesized by co-precipitating ferric and ferrous salts by adding base solution (1M-NaOH) in colloidal GO solution. The resulting black precipitate was magnetically separated and washed three times with deionized water and ethanol prior drying in an oven at 60 ℃. The maghemite-graphene oxide composite powders are evaluated by powder X-ray diffraction, scanning electron microscopy, nitrogen adsorption–desorption isotherm. The ferromagnetic Fe3O4-GO layer nanocomposite exhibited high specific surface area of up to ~ 450 m2/g, which are very promising features in the immobilization and delivery for active biomolecules. |
