Study Of Ni/γ-Fe₂O₃ Nanowires Prepared By Templates Assembly

The AAO templates were used to prepare γ-Fe₂O₃ nanowires, Ni nanowires, Ni nanotubules and Ni/γ-Fe₂O₃ composite nanowires. The microstructure of the nanowires and nanotubules was studied by employing the TEM, SAED and XRD techniques. Experimental results show that γ-Fe₂O₃ nanowires have an uniform diameter with a size of 40⁵0 nm and a length of 3⁴ μm. The diameters of nanowires can be controlled by changing the voltage and the temperature of the electrolyte in the anode oxidation by which AAO templates were prepared. The β-FeOOH nanowires can not be prepared when the temperature of the solution is below 20 ℃. The crystal structure of nanowires is dependent on the annealing temperature. When the annealing temperature is above 300 ℃ the γ-Fe₂O₃ nanowires will be obtained Ni nanowires have a crystal structure and Ni nanotubules have an amorphous structure. The diameter of Ni nanowires is about 40⁵0 nm, and the thickness of the wall of Ni nanotubules is about 3¹0 nm. The thickness of the wall of Ni nanotubules changes with both the electrodeposition current density and the electrodeposition time. Ni/γ-Fe₂O₃ composite nanowires were prepared by AAO template assembly technique. The crystal γ-Fe₂O₃ nanowires with a diameter of 40⁴5 nm stand in the center of the composite nanowires, the outer layer of the nanowires is the amorphous Ni with a thickness of about 4⁵ nm.