Synthesis of magnetic nanostructures: Shape tuning by the addition of a polymer at low temperature |
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Authors: | Md Harunar Rashid Manoj Raula Tarun K Mandal |
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Affiliation: | Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India |
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Abstract: | We report a simple method for shape-controlled synthesis of iron oxide spinels such as magnetite (Fe3O4) and maghemite (γ-Fe2O3) nanostructures using a thermoresponsive polymer poly(vinyl methyl ether) (PVME) by the alkaline hydrolysis of iron salt at low temperature (20 °C). Microscopic analysis confirmed the formation of needle- and flower-shaped iron oxide nanostructures depending on reaction conditions. High-resolution transmission electron microscopic analysis of the needle- and flower-shaped nanostructures as well as their corresponding selected area electron diffraction patterns revealed that the formed nanostructures are crystalline in nature. X-ray diffraction study reveals the formation of well-crystalline pure Fe3O4 and γ-Fe2O3 nanostructures under different reaction conditions. Fourier transform Infra-red spectroscopic analysis confirms the adsorption of PVME on the surface of iron oxide nanostructures. Finally, the magnetic properties of γ-Fe2O3 and Fe3O4 nanostructures is studied that shows the superparamagnetic behavior of the formed iron oxide nanostructures. |
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Keywords: | Polymers Nanostructures Magnetic materials Chemical synthesis Oxides |
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