| 초록 |
Magnetic nanoparticles, in particular the oxides of iron, have widespread technological applications such as magnetic storage media, sensors, catalysis, clinical diagnosis and treatment etc. In this work, we report a facile route for the preparation of flower like iron oxide nanostructures and investigated their optical and magnetic properties. The samples were prepared by using ethylene glycol mediated process followed by different calcination temperatures. All the samples were characterized by X-Ray diffraction (XRD) analysis and the morphology was examined by field emission electron microscopy (FE-SEM). The FE-SEM image showed that α-Fe2O3 nanostructures were of 3D flower like shape and approximately 4 μm in diameter. Magnetic properties of the as prepared samples were investigated by using on a vibrating sample magnetometer (VSM). Using UV-visible spectrum, the optical band-gap energy was estimated. UV-visible measurement showed that the band-gap energy is decreased with increasing calcination temperature. The excellent tuning in the band-gap energy shown by the UV-visible measurement reveals that these materials can be efficiently utilized in various applications. |
