فهرست نشریات علمی دسترسی آزاد ایران

In this work iron (III) oxide (Fe2O3 In this work hydrothermal method was used for synthesize iron (III) oxide nanoparticles at several temperatures.  Ferric chloride hexahydrate (FeCl3.6H2O) was used for the preparation, the preparation was carried out at pH 9 and 60, 100 and 160 oC. Size, structure and optical band gab were determined by using UV-Vis (Ultraviolet Visible) analysis, XRD (X ray diffraction) and SEM (Scanning Electron Microscope).  Hematite (the other name for Fe2O3) that prepared by hydrothermal method has small size and good crystallinity. UV-Vis spectroscopy showed a red shift for the absorption peak at 160 oC. the average diameters of the nanoparticles decreased with a comparable rise in temperature, according to FE-SEM microscopy. XRD crystallography showed a good structural pattern for Fe2O3 nanoparticles with a decrease in crystallite size as temperature increased. In addition, XRD results data exhibit a rhombohedral (hexagonal) structure and revealed an average size of 23, 12, 11.7nm at temperatures range of: 60,100 and160 °C, respectively, which is consistent with SEM images. Hematite prepared by 160 oC has lower average size, better crystallinity, highest band gap compared to the hematite prepared by 60 and 100 oC.