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Facile Fabrication of Hierarchical α-Fe2O3: Self-Assembly and Its Magnetic and Electrochemical Properties

Muruganandham, Manickavachagam and Amutha, Ramakrishnan and Sathish, Marappan and Singh, Tony Sarvinder and Suri, Rominder P.S. and Sillanpää, Mika (2011) Facile Fabrication of Hierarchical α-Fe2O3: Self-Assembly and Its Magnetic and Electrochemical Properties. The Journal of Physical Chemistry C . ISSN 1932-7447

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We report novel fabrication of various surfacestructure- controlled morphologies of α-Fe2O3 in a simple thermal decomposition process. Ferric nitrateoxalic acid complex formed in ethanol solvent facilitates chain- and rodlike morphological hematites after thermal evaporation of solvent followed by decomposition at 400 C. This simple methodology offers industrially applicable nanostructured hematite preparation. The oxalic acid concentration and method of solvent evaporation played an important role in the final morphology. Increasing the oxalic acid concentration from 0.125 to 0.4 M facilitated hematite chainlike morphology of porous aggregates. Thermal decomposition temperature played an important role on the surface structure of hematite. The synthesized hematite was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Raman spectra, Fourier transform infrared spectra (FTIR), and nitrogen adsorption analysis. The influence of various solvents such as ethanol, methanol, propanol, t-butanol, and various iron precursors on the final morphology was investigated, and the results indicated that both solvents and iron precursors are crucial for the final hematite morphology. The magnetic properties of the synthesized chainlike hematite were studied, and the remnant magnetization and coercivity of the chainlike α-Fe2O3 at 300 K are found to be 1.36 emu/g and 147 Oe, respectively. The electrochemical Li ion battery performance of synthesized hematite was investigated. A plausible mechanism of hematite self-assembly was proposed.

Item Type:Article
Subjects:Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:11727
Deposited By:Prof. Mika Sillanpää
Deposited On:13 Jan 2012 13:41
Last Modified:13 Jan 2012 13:41

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