Poster Presentation

Akram Hosseinian

School of Engineering Science, College of Engineering, University of Tehran, P.O. Box 11365-4563 Tehran, Islamic Republic of Iran- 09126156376

Synthesis of oxide nanoparticles attracts more and more attention because these nanoparticles exhibit electrical, optical and magnetic properties that are different from their bulk counterparts. The study of Iron oxides has attracted intensive attention over the past decades due to the potential applications in catalysts, gas sensors, high density magnetic recording media, printing ink, ferro fluid, magnetic resonance imaging and especially biomedical field, etc. Photocatalytic processes at semiconductor have received remarkable attention because of their potential application to the conversion of solar energy into chemical energy and pollution control. The photoassisted catalytic degradation of the dyes occurs by the active species created on the surface of metal-oxide semiconductor nanostructures in aqueous solution. Also the photogenerated electron–hole pair has a life span in the space charge region which facilitates its dynamic involvement in chemical reactions under the irradiation of proper energy. Iron oxides include α-Fe2O3, γ-Fe2O3 and Fe3O4. Among these Iron oxides, α-Fe2O3 has the corundum structure, while the other two have the cubic structure. Various methods have been reported for the synthesis of Iron oxide nanostructures. These methods include reduction of iron salts in micelles, thermal reactions using the electrochemical method, co-precipitation, microemulsion, hydrothermal synthesis and sol-gel method etc. All these methods to Iron oxide nanostructures are in general complicated and expensive. There are many advantages in the solid-state reaction approach such as: (a) simple, cheaper and convenient; (b) involve less solvent and reduce contamination; (c) give high yields of products.
In this paper, we synthesize Iron oxide nanostructures with different morphologies by solid-state reaction method. Our studies show that this method is not only a simple process but also gives as uniform and monodiesperse products as those by other lucrative methods. We have also investigated the effect of halogen and pseudo halogen salts on the morphology and explained in light of the proposed mechanisms. Nanostructured Iron Oxide with morphologies of granular has been successfully prepared via a solid-state reaction in the presence of halogen salts. The added salt not only prevents a drastic increase in the size of the products but also provide suitable conditions for the oriented growth of primary nanoparticles. The formation mechanisms of this material by solid-state reaction at ambient temperature are proposed. The Iron Oxide nanoparticles were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and IR Spectroscopy.

Nano, Iron Oxide, Solid-State, Halide salts, X-ray; SEM