| dc.description.abstract | Recently, Co-Ni alloy thin film and particles have already been found their potential applications in sensors, advanced micoactuators, and magnetic recording medias. However, the synthesis and applications of one-dimensional (1-D) Co-Ni alloy nanowires with different contents have not been intensively studied. To fabricate large-area size-tunable Co-Ni alloy nanowire array at low-cost, an effective and economical technique-anodic alumina oxide (AAO) template-assisted electrodeposition process is one of the most promising schemes to replace the conventional lithography methods.
In the study, we demonstrated that the AAO template with 2-D periodic nanopore structure and large-scale well-aligned Co-Ni alloy nanowire array with different composition ratio of Co and Ni were successfully fabricated under controlled synthesizing conditions. The pore diameter and lengths of the as-prepared AAO template can be tuned from 20-100 nm and 40-130 μm, respectively. After DC electrodeposition and subsequent removing the AAO templates, high-density, well-aligned Co-Ni alloy nanowires with different concentration ratio of Co to Ni(Co:Ni=1:9, Co:Ni=1:1, Co:Ni=9:1) were were successfully synthesizied. From the EDS line-scan profiles analysis, it is revealed that alloy nanowires were entirely composed of Co and Ni, and uniforem distributions of Co anf Ni throughout these nanowires. Based on the TEM and SAED analysis, it is found that the three sets of Co-Nialloy nanowires were all single crystalline, and these single crystalline Co-Ni nanowire possess a HCP structure. The growth direction of the Co-Ni alloy nanowires of samples A(Co:Ni=1:9), B(Co:Ni=1:1), and C(Co:Ni=9:1) were identified to be along the [1 11], [ 41], and [ 41] directions, repectively. On the other Hand, the Co-Ni nanowires were found to be very sensitive to the magnetic. In this study, we experimentally demonstrated that by applying external magnetic fileds, these Co-Ni nanowires can be controlled to align along the directions of applied magnetic filed and assemble into a 2-D ordered pattern on Si substrate. | en_US |