科研之友
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摘要
Highly-ordered Fe nanowires (NWs) were successfully electrodeposited in a laboratory made anodic aluminum oxide template with a diameter of 30 nm. The as prepared Fe NWs were used as a substrate to prepare core-shell Fe@Fe3O4 NWs after annealing and hydrogen reduction at high temperature. The phase transformation of the oxide shell of electrodeposited Fe NWs took the form Fe2O3 -> alpha-Fe2O3 -> Fe3O4. Transmission electron microscopy images revealed that the surface of Fe@Fe x-1O x NWs was smooth and orderly, and the oxide layer was dense and uniform. The magnetic analysis of Fe@Fe x-1 O- x nanowires was carried out using a vibrating sample magnetometer. It was found that Fe@Fe3O4 nanowires manifested the characteristics of super-paramagnetism in the direction perpendicular to the nanowires due to smaller coercive force, and they can be suitable material for future biomedical applications.
