Document Type : Regular Article
Department of Physics, Varamin Pishva Branch, Islamis Azad University, Varamin, Iran
In the past decade, magnetic nanomaterials have attracted much attention due to their physical properties and technological applications. In this work, α-Fe2O3 nanoparticles were first synthesized via a simple co-precipitation method using iron chloride hexahydrate (FeCl3.6H2O) as precursor and ammonia solution as precipitator. The samples were then characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS) Fourier transform infrared spectroscopy (FTIR) and UV-Vis spectrophotometer. XRD pattern showed that the iron oxide nanoparticles exhibited alpha-Fe2O3 (hematite) structure innanocrystals. The α- Fe2O3 nano-powders with uniform size were prepared when the samples calcined at 500 °C, and the lowest particle size was found to be 30 nm by XRD technique and direct HRTEM observation. The surface morphological studies from SEM depicted sphere-like shaped particles with formation of clusters by increasing annealing temperature. The EDS spectrum showed peaks of iron and oxygen free of impurity with fewer elements. The sharp peaks in FTIRspectrum determined the purity of Fe2O3 nanoparticles and absorbance peak of UV-Vis spectrum showed the small bandgap energy of 2.58 ev.