Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 16, Pages 14583-14589Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5038998
Keywords
segmented nanowires; interfaces; template-assisted electrodeposition; electrocrystallization; electron microscopy; magnetic properties
Funding
- European Community [296679]
- Spanish Ministerio de Economia y Competitividad (MINECO) [MAT2011-27380-C02-01, RYC-2012-10839]
- Catalan Government [2014-SGR-1015]
- ICREA Funding Source: Custom
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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.
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