摘要
Iron oxide particles with various shapes,sizes and phase concentrations(including--Fe2O3 and Fe3O4) have been synthesized through a simple hydrothermal method in the ethylene glycol(EG)-water system.In the preparation conditions,ferric chloride(FeCl3.6H2O) was used as the iron source in the presence of sodium hydroxide(NaOH) without any surfactants.By adjusting the experimental parameters(EG/H2O ratio,base content,iron ions concentration,etc.),the shape,the size,the phase and the magnetic property of the products could be easily controlled.The products were characterized by using X-ray diffraction(XRD),scanning electron microscopy(SEM),and a vibrating sample magnetometer(VSM).A further investigation revealed that high EG content and high alkaline condition favored the formation of Fe3O4 phase.A possible growth mechanism was proposed based on the experimental results.The magnetic properties were deeply affected by the morphology and phase of the as-synthesized products.The controlled shape,size and phase structure of the iron oxides through simple synthetic procedures provides potential opportunities to realize the promising size and shape-dependent applications.
Iron oxide particles with various shapes, sizes and phase concentrations （including α-Fe2O3 and Fe3O4） have been synthesized through a simple hydrothermal method in the ethylene glycol （EG）-water system. In the preparation conditions, ferric chloride （FeCl36H2O） was used as the iron source in the presence of sodium hydroxide （NaOH） without any surfactants. By adjusting the experimental parameters （EG/H2O ratio, base content, iron ions concentration, etc.）, the shape, the size, the phase and the magnetic property of the products could be easily controlled. The products were characterized by using X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and a vibrating sample magnetometer （VSM）. A further investigation revealed that high EG content and high alkaline condition favored the formation of Fe3O4 phase. A possible growth mechanism was proposed based on the experimental results. The magnetic properties were deeply affected by the morphology and phase of the as-synthesized products. The controlled shape, size and phase structure of the iron oxides through simple synthetic procedures provides potential opportunities to realize the promising size and shape-dependent applications.
基金
supported by the National Natural Science Foundation of China (Grant Nos. 50832003 and 50972073)
