Abstract
Cobalt-nickel (Co-Ni) binary alloy nanowires of different compositions were co-deposited in the nanopores of highly ordered anodic aluminum oxide (AAO) templates from a single sulfate bath using alternating current (AC) electrodeposition. AC electrodeposition was accomplished without modifying or removing the barrier layer. Field emission scanning electron microscope was used to study the morphology of templates and alloy nanowires. Energy-dispersive X-ray analysis confirmed the deposition of Co-Ni alloy nanowires in the AAO templates. Average diameter of the alloy nanowires was approximately 40 nm which is equal to the diameter of nanopore. X-ray diffraction analysis showed that the alloy nanowires consisted of both hexagonal close-packed and face-centered cubic phases. Magnetic measurements showed that the easy x-axis of magnetization is parallel to the nanowires with coercivity of approximately 706 Oe. AC electrodeposition is very simple, fast, and is useful for the homogenous deposition of various secondary nanostuctured materials into the nanopores of AAO.
Highlights
Porous anodic aluminum oxide (AAO) attracted a remarkable interest due to the pioneer work of Masuda and Fukuda [1]
It further verifies the suppression of cape formation over the top surface of Co-Ni binary nanowires. These results show that the most of the nanochannels of alumina are successfully filled with Co-Ni binary nanowires and have continuous morphology without any intermittence contrary to the chain-like CoNi alloy wires [29,32,33]
Hexagonal ordered AAO templates were synthesized in 0.4 M H2SO4 at 26 V in 0°C environment via single-step anodization
Summary
Porous anodic aluminum oxide (AAO) attracted a remarkable interest due to the pioneer work of Masuda and Fukuda [1]. Self-organized nanoporous structure with hexagonal ordered morphology can be obtained on a highly pure Al surface via electrochemical anodization in acidic medium [1,2]. AAO is extensively applied in the fields of biosensor [3] and biofiltration [4] and as a nanotemplate [5,6] for the fabrication of secondary nanostructured materials. Length, inter-pore spacing, and pore ordering can be tailored by tuning the anodizing parameters such as voltage, time, electrolytes, pH value, and temperature. One-dimensional (1D) nanostructured materials such as nanowires, nanorods, and nanotubes play a special role in the field of nanoscience and nanotechnology due to their high aspect ratio (length/diameter) and large surface area
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