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Fabrication of Segmented Au/Co/Au Nanowires: Insights in the Quality of Co/Au Junctions
- Fabrication of Segmented Au/Co/Au Nanowires: Insights in the Quality of Co/Au Junctions
- Jang, Bumjin; Pellicer, Eva; Guerrero, Miguel; Chen, Xiangzhong; Choi, Hongsoo; Nelson, Bradley J.; Sort, Jordi; Pane, Salvador
- DGIST Authors
- Choi, Hongsoo
- Issue Date
- ACS Applied Materials and Interfaces, 6(16), 14583-14589
- Article Type
- Anodic Aluminum Oxide Template; Anodic Oxidation; Cobalt; Crystal Growth; Crystalline Structure; Deposition; Electrochemical Conditions; Electrochemistry; Electrocrystallization; Electrocrystallization Process; Electrodeposition; Electrolytes; Electron Microscopy; Hexagonal Close-Packed; Interfaces; Interfaces (Materials); Magnetic Properties; Nanorods; Nanowires; Potential Building Blocks; Segmented Nanowires; Semiconductor Junctions; Template-Assisted Electrodeposition; Template-Assisted Electrodepositions
- Electrodeposition is a versatile method, which enables the fabrication of a variety of wire-like nanoarchitectures such as nanowires, nanorods, and nanotubes. By means of template-assisted electrodeposition, segmented Au/Co/Au nanowires are grown in anodic aluminum oxide templates from two different electrolytes. To tailor the properties of the cobalt segments, several electrochemical conditions are studied as a function of current density, pulse deposition, and pH. The morphology, crystal structure, and magnetic properties are accordingly investigated. Changes in the deposition conditions affect the cobalt electrocrystallization process directly. Cobalt tends to crystallize mainly in the hexagonal close-packed structure, which is the reason cobalt might not accommodate satisfactorily on the face-centered cubic Au surface or vice versa. We demonstrate that by modifying the electrolyte and the applied current densities, changes in the texture and the crystalline structure of cobalt lead to a good quality connection between dissimilar segments. In particular, lowering the bath pH, or using pulse plating at a high overpotential, produces polycrystalline fcc Co and thus well-connected Co/Au bimetallic junctions with smooth interface. These are crucial factors to be carefully considered taking into account that nanowires are potential building blocks in micro- and nanoelectromechanical systems. © 2014 American Chemical Society.
- American Chemical Society
- Related Researcher
Choi, Hong Soo
Bio-Micro Robotics Lab
Micro/Nano robot; Neural prostheses; MEMS; BMI; MEMS/NEMS; BioMEMS; MEMS 초음파 트랜스듀스; 인공와우
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- Department of Robotics EngineeringBio-Micro Robotics Lab1. Journal Articles
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