Preparation and Characterization of Fe(3)O(4) Particles with Novel Nanosheets Morphology and Magnetochromatic Property by a Modified Solvothermal Method

Novel-morphological Fe(3)O(4) nanosheets with magnetochromatic property have been prepared by a modified solvothermal method. Such nanosheets could form one-dimension photonic crystal under an external magnetic field. The Fe(3)O(4) nanosheets suspension could strongly diffract visible light and display varied colors with changing the intensity of the magnetic field. The photonic response is rapid, fully reversible and widely tunable in the entire visible spectrum. Excellent magnetic properties of these Fe(3)O(4) nanosheets are exhibited with a high saturation magnetization (82.1 emu/g), low remanence (13.85 emu/g) and low coercive force (75.95 Oe). The amount of the solvent diethylene glycol (DEG) plays a key role in the formation of the sheet-shaped morphology. When the ratio of the DEG reaches 100%, the growing of the crystal plane (111) of Fe(3)O(4) is inhibited and the sheet-like Fe(3)O(4) crystals are formed.