Hao Li and Shijun Liao 2008 J. Phys. D: Appl. Phys. 41 065004 doi:10.1088/0022-3727/41/6/065004
Hao Li and Shijun Liao1
Show affiliationsA facile solvothermal route was developed to prepare flower-like Co microcrystals composed of Co nanoplates, in which water/ethanol mixture was used as solvent and ethylenediamine tetraacetic acid sodium was used as complexing agent, respectively. X-ray diffraction pattern showed that the synthesized Co microcrystals were present in hexagonal close-packed phase and x-ray photoelectron spectroscopy analysis indicated that the surface of the sample was oxidized. Scanning electron microscope images revealed that each of the flowery Co microcrystals was composed of several pieces of Co plates with uniform thickness of ca 200 nm. It was found that the solvents played a crucial role in determining the morphology of the Co products and the introduction of a certain amount of ethanol was indispensable for the formation of flower-shaped morphology. Magnetic measurement at room temperature indicated that the coercivity (Hc) of the flower-like Co microcrystals came up to 407.3 Oe, which was much higher than that of bulk Co metal.
81.16.Be Chemical synthesis methods
68.37.Hk Scanning electron microscopy (SEM) (including EBIC)
79.60.Jv Interfaces; heterostructures; nanostructures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Condensed matter: electrical, magnetic and optical
Issue 6 (21 March 2008)
Received 18 November 2007, in final form 31 January 2008
Published 27 February 2008
Hao Li and Shijun Liao 2008 J. Phys. D: Appl. Phys. 41 065004
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