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Synthesis of superparamagnetic bare Fe₃O₄ nanostructures and core/shell (Fe₃O₄/alginate) nanocomposites

Author:
Srivastava, Manish, Singh, Jay, Yashpal, Madhu, Gupta, Dinesh Kumar, Mishra, R.K., Tripathi, Shipra, Ojha, Animesh K.
Source:
Carbohydrate polymers 2012 v.89 no.3 pp. 821-829
ISSN:
0144-8617
Subject:
Fourier transform infrared spectroscopy, Raman spectroscopy, X-radiation, X-ray diffraction, ambient temperature, energy-dispersive X-ray analysis, iron oxides, magnetic properties, nanocomposites, nanoparticles, pH, particle size, transmission electron microscopy
Abstract:
In this article we report about the synthesis of superparamagnetic bare Fe₃O₄ nanostructures and core/shell (Fe₃O₄/alginate) nanocomposites by simple low-temperature based method at pH values 5, 9, and 14. The structural morphology and magnetic behavior of Fe₃O₄ nanostructures and core/shell (Fe₃O₄/alginate) nanocomposites (Fe₃O₄/alg NCs) have been investigated by X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy (RS), ultraviolet–visible (UV–vis) spectroscopy, transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM). The particle size was calculated by TEM measurements and it turns out to be ∼10nm and ∼14nm for bare Fe₃O₄ nanoparticle and Fe₃O₄/alg NCs with core/shell structure, respectively. The magnetic properties of the synthesized products were found to be function of pH at which the synthesis has been done. The synthesized Fe₃O₄ nanoparticle and Fe₃O₄/alg NCs were found to be superparmagnetic in nature at room temperature. We observed that the value of saturation magnetization in case of Fe₃O₄/alg NCs decreases by increasing the pH value.
Agid:
879406