Anil Kumar and Aditi Singhal 2007 Nanotechnology 18 475703 doi:10.1088/0957-4484/18/47/475703
Anil Kumar and Aditi Singhal
Show affiliationsβ-Fe2O3 nanostructures of different shapes have been synthesized by the hydrolysis of FeCl3 in the absence and presence of Co2+ ions. These materials have been characterized by UV–vis spectroscopy, x-ray diffraction, field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), transmission electron microscopy (TEM) and superconducting quantum interference device magnetometry (SQUID). The addition of Co2+ transforms the shape of nanosized β-Fe2O3 from rods to become spherical. These nanostructures demonstrate superparamagnetic behavior. The extent of saturation magnetization is enhanced by a factor of 3 from 0.49 to 1.56 emu g−1 upon addition of 0.12% Co2+.
81.16.-c Methods of nanofabrication and processing
75.75.+a Magnetic properties of nanostructures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.40.Ha Other nonmetallic inorganics
78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Issue 47 (28 November 2007)
Received 11 August 2007, in final form 21 September 2007
Published 17 October 2007
Anil Kumar and Aditi Singhal 2007 Nanotechnology 18 475703
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