Magnetic Fe3O4nanodisc synthesis on a large scale via a surfactant-assisted process

Ultrathin magnetic Fe 3 O 4 nanodiscs with thicknesses of ∼20 nm and diameters ranging from 500 to 1000 nm have been obtained on a large scale by a surfactant-assisted solvothermal process. Transmission electron microscopy characterizations show that the nanodiscs grow along the [110] direction. NaOH and PEG-20000 (PEG stands for polyethylene glycol) have key effects on the morphology of the nanodiscs. In addition, the magnetic hysteresis loop of the ultrathin nanodiscs is obtained at room temperature.